Extracting prog: 23.615664074s
Minimizing prog: 12m16.083205473s
Simplifying prog options: 0s
Extracting C: 32.108479976s
Simplifying C: 2m43.808080439s


extracting reproducer from 42 programs
testing a last program of every proc
single: executing 9 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET-socket$nl_route-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT-sendmsg$nl_route_sched-ioctl$OCFS2_IOC_GROUP_ADD
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
r5 = syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET(r4, &(0x7f0000000280)={&(0x7f00000000c0)={0x10, 0x0, 0x0, 0x8}, 0xc, &(0x7f0000000240)={&(0x7f0000000180)={0xac, r5, 0x200, 0x70bd2c, 0x25dfdbff, {}, [{{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x1}}, {0x8, 0xb, 0x1}, {0x6}, {0x5, 0x12, 0x1}, {0x6, 0x11, 0x4422}, {0x8, 0xb, 0x9}}, {{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x3}}, {0x8, 0xb, 0xa8e}, {0x6, 0x16, 0x3}, {0x5}, {0x6, 0x11, 0x8}, {0x8, 0xb, 0x1}}]}, 0xac}, 0x1, 0x0, 0x0, 0x20040040}, 0x24008095)
r6 = socket$nl_route(0x10, 0x3, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})
sendmsg$nl_route_sched(r6, &(0x7f0000000340)={0x0, 0x0, &(0x7f0000000140)={&(0x7f0000000000)=@deltaction={0x60, 0x18, 0x1, 0x70bd2c, 0x25dfdc00, {0xa}, [@TCA_ACT_TAB={0x4c, 0x1, [{0xc, 0x8d, 0x0, 0x0, @TCA_ACT_INDEX={0x8, 0x3, 0x7}}, {0x14, 0x5, 0x0, 0x0, @TCA_ACT_KIND={0xf, 0x1, 'tunnel_key\x00'}}, {0xc, 0x9, 0x0, 0x0, @TCA_ACT_INDEX={0x8, 0x3, 0x6}}, {0x10, 0x16, 0x0, 0x0, @TCA_ACT_KIND={0xa, 0x21, 'pedit\x00'}}, {0xc, 0x6, 0x0, 0x0, @TCA_ACT_INDEX={0x8}}]}]}, 0x60}, 0x1, 0x0, 0x0, 0x44000}, 0x20000844)
ioctl$OCFS2_IOC_GROUP_ADD(r0, 0x40186f02, &(0x7f00000003c0)={0x1, 0x9, 0x9, 0x17})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
single: successfully extracted reproducer
found reproducer with 16 syscalls
minimizing guilty program
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET-socket$nl_route-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
r5 = syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET(r4, &(0x7f0000000280)={&(0x7f00000000c0)={0x10, 0x0, 0x0, 0x8}, 0xc, &(0x7f0000000240)={&(0x7f0000000180)={0xac, r5, 0x200, 0x70bd2c, 0x25dfdbff, {}, [{{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x1}}, {0x8, 0xb, 0x1}, {0x6}, {0x5, 0x12, 0x1}, {0x6, 0x11, 0x4422}, {0x8, 0xb, 0x9}}, {{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x3}}, {0x8, 0xb, 0xa8e}, {0x6, 0x16, 0x3}, {0x5}, {0x6, 0x11, 0x8}, {0x8, 0xb, 0x1}}]}, 0xac}, 0x1, 0x0, 0x0, 0x20040040}, 0x24008095)
r6 = socket$nl_route(0x10, 0x3, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})
sendmsg$nl_route_sched(r6, &(0x7f0000000340)={0x0, 0x0, &(0x7f0000000140)={&(0x7f0000000000)=@deltaction={0x60, 0x18, 0x1, 0x70bd2c, 0x25dfdc00, {0xa}, [@TCA_ACT_TAB={0x4c, 0x1, [{0xc, 0x8d, 0x0, 0x0, @TCA_ACT_INDEX={0x8, 0x3, 0x7}}, {0x14, 0x5, 0x0, 0x0, @TCA_ACT_KIND={0xf, 0x1, 'tunnel_key\x00'}}, {0xc, 0x9, 0x0, 0x0, @TCA_ACT_INDEX={0x8, 0x3, 0x6}}, {0x10, 0x16, 0x0, 0x0, @TCA_ACT_KIND={0xa, 0x21, 'pedit\x00'}}, {0xc, 0x6, 0x0, 0x0, @TCA_ACT_INDEX={0x8}}]}]}, 0x60}, 0x1, 0x0, 0x0, 0x44000}, 0x20000844)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET-socket$nl_route-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
r5 = syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET(r4, &(0x7f0000000280)={&(0x7f00000000c0)={0x10, 0x0, 0x0, 0x8}, 0xc, &(0x7f0000000240)={&(0x7f0000000180)={0xac, r5, 0x200, 0x70bd2c, 0x25dfdbff, {}, [{{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x1}}, {0x8, 0xb, 0x1}, {0x6}, {0x5, 0x12, 0x1}, {0x6, 0x11, 0x4422}, {0x8, 0xb, 0x9}}, {{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x3}}, {0x8, 0xb, 0xa8e}, {0x6, 0x16, 0x3}, {0x5}, {0x6, 0x11, 0x8}, {0x8, 0xb, 0x1}}]}, 0xac}, 0x1, 0x0, 0x0, 0x20040040}, 0x24008095)
socket$nl_route(0x10, 0x3, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET-socket$nl_route
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
r5 = syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET(r4, &(0x7f0000000280)={&(0x7f00000000c0)={0x10, 0x0, 0x0, 0x8}, 0xc, &(0x7f0000000240)={&(0x7f0000000180)={0xac, r5, 0x200, 0x70bd2c, 0x25dfdbff, {}, [{{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x1}}, {0x8, 0xb, 0x1}, {0x6}, {0x5, 0x12, 0x1}, {0x6, 0x11, 0x4422}, {0x8, 0xb, 0x9}}, {{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x3}}, {0x8, 0xb, 0xa8e}, {0x6, 0x16, 0x3}, {0x5}, {0x6, 0x11, 0x8}, {0x8, 0xb, 0x1}}]}, 0xac}, 0x1, 0x0, 0x0, 0x20040040}, 0x24008095)
socket$nl_route(0x10, 0x3, 0x0)

program did not crash
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
r5 = syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
sendmsg$DEVLINK_CMD_SB_TC_POOL_BIND_SET(r4, &(0x7f0000000280)={&(0x7f00000000c0)={0x10, 0x0, 0x0, 0x8}, 0xc, &(0x7f0000000240)={&(0x7f0000000180)={0xac, r5, 0x200, 0x70bd2c, 0x25dfdbff, {}, [{{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x1}}, {0x8, 0xb, 0x1}, {0x6}, {0x5, 0x12, 0x1}, {0x6, 0x11, 0x4422}, {0x8, 0xb, 0x9}}, {{@pci={{0x8}, {0x11}}, {0x8, 0x3, 0x3}}, {0x8, 0xb, 0xa8e}, {0x6, 0x16, 0x3}, {0x5}, {0x6, 0x11, 0x8}, {0x8, 0xb, 0x1}}]}, 0xac}, 0x1, 0x0, 0x0, 0x20040040}, 0x24008095)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$OCFS2_IOC_REFLINK-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
r4 = openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$OCFS2_IOC_REFLINK(r4, 0x40186f04, &(0x7f0000000380)={&(0x7f00000002c0)='-\x00', &(0x7f0000000300)='[!-2,\x00', 0x3})
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-syz_genetlink_get_family_id$devlink-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
syz_genetlink_get_family_id$devlink(&(0x7f0000000100), 0xffffffffffffffff)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-openat$vcsa-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
openat$vcsa(0xffffffffffffff9c, &(0x7f0000000080), 0x80400, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$PPPIOCGL2TPSTATS-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$PPPIOCGL2TPSTATS(r3, 0x80047437, 0xfffffffffffffffe)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000380)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x0, @remote}, 0x4, 0x4, 0x1}}, 0x26)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-socket$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
socket$pppl2tp(0x18, 0x1, 0x1)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
r2 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-socket$inet_udp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
socket$inet_udp(0x2, 0x2, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program did not crash
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-bpf$PROG_LOAD-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
bpf$PROG_LOAD(0x5, &(0x7f0000000400)={0x6, 0xc, &(0x7f00000004c0)=ANY=[@ANYBLOB="180000000001000000000000030000c41711000029aa8246ebd64c8588c99225f1e2609abaa37f506201703155a7a2953bef50fdf524a4d8701d84ba327e5ef838c44d46cace1f9725228e668811086167d36c6be8a87494bc536771c1b4550839d8", @ANYRES32=r1, @ANYBLOB="0000000000000000b7080000020000007b8af8ff00000000bca2000000000000a6020000f8ffffffb703000008000000b70400000200000085000000330000009500000000000000"], &(0x7f0000000180)='GPL\x00', 0x0, 0x0, 0x0, 0x41100, 0x8, '\x00', 0x0, @xdp=0x25, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, 0xffffffffffffffff, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program did not crash
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-bpf$MAP_CREATE-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(0xffffffffffffffff, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program did not crash
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, 0x0, 0x0)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, &(0x7f0000000580)={0x40, 0x3, 0x4})

program did not crash
testing program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
extracting C reproducer
testing compiled C program (duration=32.043846303s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Write in pppol2tp_release
simplifying C reproducer
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
testing program (duration=32.043846303s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet_udp-connect$pppl2tp-ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000300)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x3, 0x0, {0xa, 0x0, 0x0, @private0}}}, 0x32)
ioctl$BTRFS_IOC_SUBVOL_SYNC_WAIT(r0, 0x40109441, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
reproducing took 17m52.639554381s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
Read of size 4 at addr ffff8881114b0400 by task syz.2.17/371

CPU: 0 PID: 371 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9232039e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff45a44648 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff45a44730 RCX: 00007f9232039e59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006cb4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32e20000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92322c1fac R14: 00007f92322c1fa8 R15: 00007f92322c1fa0
 </TASK>

Allocated by task 371:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 kzalloc include/linux/slab.h:750 [inline]
 l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772
 __sys_connect_file net/socket.c:1922 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1939
 __do_sys_connect net/socket.c:1949 [inline]
 __se_sys_connect net/socket.c:1946 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1946
 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 10:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kfree+0xc4/0x270 mm/slub.c:4588
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline]
 l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff8881114b0400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff8881114b0400, ffff8881114b0600)
The buggy address belongs to the page:
page:ffffea0004452c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1114b0
head:ffffea0004452c00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00043f1100 0000000600000006 ffff888100042f00
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 106, ts 4008996453, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x210/0x730 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_skb_with_frags+0xa8/0x620 net/core/skbuff.c:6207
 sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2542
 unix_dgram_sendmsg+0x6f3/0x19b0 net/unix/af_unix.c:1816
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x2a6/0x3a0 net/socket.c:1079
 call_write_iter include/linux/fs.h:2212 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881114b0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881114b0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881114b0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881114b0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881114b0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 371 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 0 PID: 371 Comm: syz.2.17 Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Code: 5d c3 e8 1c f1 0b fd be 02 00 00 00 eb 0a e8 10 f1 0b fd be 01 00 00 00 4c 89 f7 e8 a3 60 f2 fd e9 0f ff ff ff e8 f9 f0 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 e8 f0 0b fd 4c 89 f7 be 03
RSP: 0018:ffffc90000af7d10 EFLAGS: 00010293
RAX: ffffffff845dbbf7 RBX: ffff88812b56c000 RCX: ffff8881102a2780
RDX: 0000000000000000 RSI: 00000000073d1360 RDI: 000000000c04eb7d
RBP: ffffc90000af7d30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000073d1360 R15: ffff8881114b0400
FS:  00005555579fa500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 000000012e6a4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9232039e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff45a44648 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff45a44730 RCX: 00007f9232039e59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006cb4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32e20000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92322c1fac R14: 00007f92322c1fa8 R15: 00007f92322c1fa0
 </TASK>
---[ end trace 443bd350ec35297e ]---

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
Read of size 4 at addr ffff8881114b0400 by task syz.2.17/371

CPU: 0 PID: 371 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9232039e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff45a44648 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff45a44730 RCX: 00007f9232039e59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006cb4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32e20000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92322c1fac R14: 00007f92322c1fa8 R15: 00007f92322c1fa0
 </TASK>

Allocated by task 371:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 kzalloc include/linux/slab.h:750 [inline]
 l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772
 __sys_connect_file net/socket.c:1922 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1939
 __do_sys_connect net/socket.c:1949 [inline]
 __se_sys_connect net/socket.c:1946 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1946
 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 10:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kfree+0xc4/0x270 mm/slub.c:4588
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline]
 l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff8881114b0400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff8881114b0400, ffff8881114b0600)
The buggy address belongs to the page:
page:ffffea0004452c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1114b0
head:ffffea0004452c00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00043f1100 0000000600000006 ffff888100042f00
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 106, ts 4008996453, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x210/0x730 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_skb_with_frags+0xa8/0x620 net/core/skbuff.c:6207
 sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2542
 unix_dgram_sendmsg+0x6f3/0x19b0 net/unix/af_unix.c:1816
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x2a6/0x3a0 net/socket.c:1079
 call_write_iter include/linux/fs.h:2212 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x831/0xfd0 fs/read_write.c:594
 ksys_write+0x14a/0x260 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881114b0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881114b0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881114b0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8881114b0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881114b0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 371 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 0 PID: 371 Comm: syz.2.17 Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Code: 5d c3 e8 1c f1 0b fd be 02 00 00 00 eb 0a e8 10 f1 0b fd be 01 00 00 00 4c 89 f7 e8 a3 60 f2 fd e9 0f ff ff ff e8 f9 f0 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 e8 f0 0b fd 4c 89 f7 be 03
RSP: 0018:ffffc90000af7d10 EFLAGS: 00010293
RAX: ffffffff845dbbf7 RBX: ffff88812b56c000 RCX: ffff8881102a2780
RDX: 0000000000000000 RSI: 00000000073d1360 RDI: 000000000c04eb7d
RBP: ffffc90000af7d30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000073d1360 R15: ffff8881114b0400
FS:  00005555579fa500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000300 CR3: 000000012e6a4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9232039e59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff45a44648 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff45a44730 RCX: 00007f9232039e59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006cb4 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b32e20000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92322c1fac R14: 00007f92322c1fa8 R15: 00007f92322c1fa0
 </TASK>
---[ end trace 443bd350ec35297e ]---