Extracting prog: 25.311676944s
Minimizing prog: 14m20.161983995s
Simplifying prog options: 0s
Extracting C: 32.224346568s
Simplifying C: 3m1.5167417s


extracting reproducer from 44 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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-close_range-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID-ioctl$KVM_GET_MSR_INDEX_LIST
detailed listing:
executing program 0:
r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r1, 0x4, 0x42000)
r2 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r2, 0x4, 0x42000)
close(0x3)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
r4 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r3, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r4, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
close_range(r4, r4, 0x2)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r5=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r5, 0x40047459, 0x0)
ioctl$KVM_GET_MSR_INDEX_LIST(r0, 0xc004ae02, &(0x7f0000000040))

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
single: successfully extracted reproducer
found reproducer with 16 syscalls
minimizing guilty program
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-close_range-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
close_range(r3, r3, 0x2)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r4=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r4, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-close_range-sendfile-syz_clone3
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
close_range(r3, r3, 0x2)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040), 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-close_range-sendfile-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
close_range(r3, r3, 0x2)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-close_range-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
close_range(r3, r3, 0x2)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r4=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r4, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r4=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r4, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-syz_emit_ethernet-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
syz_emit_ethernet(0x7a, &(0x7f0000000980)={@multicast, @empty, @void, {@ipv6={0x86dd, @gre_packet={0x7, 0x6, "0200", 0x44, 0x2f, 0xe78c6d029ffc7582, @local, @mcast2, {[], {{0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x6558, 0x0, 0x3}, {0x0, 0x0, 0x1, 0x1}, {0x0, 0x0, 0x1, 0x1}, {0x6488, 0x88be, 0x4, {{0x5, 0x1, 0x3, 0x3, 0x1, 0x0, 0x0, 0x35}, 0x1, {0x4c289}}}, {0x8, 0x22eb, 0x1, {{0xe, 0x2, 0x0, 0x1, 0x0, 0x3, 0x1, 0x4}, 0x2, {0x200004, 0x2, 0x1, 0x1, 0x1, 0x1, 0x2, 0x0, 0x1}}}, {0x8, 0x6558, 0x4}}}}}}}, 0x0)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r4=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r4, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$pppl2tp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r3=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r3, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-close-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
close(0x3)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r3=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r3, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-fcntl$setstatus-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
r1 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
fcntl$setstatus(r1, 0x4, 0x42000)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r2, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r3, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r4=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r4, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-openat-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x0)
close(0x3)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r1, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r3=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r3, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-fcntl$setstatus-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
fcntl$setstatus(r0, 0x4, 0x42000)
close(0x3)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r1, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r2, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r3=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r3, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-openat-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
openat(0xffffffffffffff9c, &(0x7f000000c380)='./file0\x00', 0x20842, 0x4)
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=32.879744307s, {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}}): openat$kvm-mknodat$loop-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
mknodat$loop(0xffffffffffffff9c, &(0x7f0000000080)='./file0\x00', 0x1000, 0x0)
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): openat$kvm-close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, &(0x7f0000000180), 0x22700, 0x0)
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, 0x0, 0x0)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r1=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r1, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(0x0, 0x0)
ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047459, 0x0)

program did not crash
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, 0x0, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(0xffffffffffffffff, 0x40047459, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Write in pppol2tp_release
simplifying C reproducer
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program did not crash
validation run: crashed=false
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
testing program (duration=32.879744307s, {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}}): close-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-sendfile-syz_clone3-ioctl$EXT4_IOC_GETFSUUID
detailed listing:
executing program 0:
close(0x3)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x8, 0x0, 0x0, 0x0, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02'}}}, 0x32)
sendfile(0xffffffffffffffff, 0xffffffffffffffff, &(0x7f0000000040)=0x3, 0xac5)
syz_clone3(&(0x7f0000000900)={0x23800000, &(0x7f0000000040)=<r2=>0xffffffffffffffff, 0x0, 0x0, {0x27}, 0x0, 0x0, 0x0, 0x0}, 0x58)
ioctl$EXT4_IOC_GETFSUUID(r2, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
reproducing took 21m6.940330754s
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 ffff88810f977400 by task syz.2.17/374

CPU: 1 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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:1336
 __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
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 do_group_exit+0x149/0x310 kernel/exit.c:1004
 get_signal+0x64f/0x1430 kernel/signal.c:2908
 arch_do_signal_or_restart+0xe2/0x1100 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 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: 0033:0x7febea1a4257
Code: Unable to access opcode bytes at RIP 0x7febea1a422d.
RSP: 002b:00007ffc9b26bbc0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 000055555643d500 RCX: 00007febea1a4257
RDX: 00007ffc9b26bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007febea280024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007febea470fac R14: 00007febea470fa0 R15: 00007febea470fa0
 </TASK>

Allocated by task 373:
 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:1923 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1940
 __do_sys_connect net/socket.c:1950 [inline]
 __se_sys_connect net/socket.c:1947 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1947
 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 ffff88810f977400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88810f977400, ffff88810f977600)
The buggy address belongs to the page:
page:ffffea00043e5d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f974
head:ffffea00043e5d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042f00
raw: 0000000000000000 0000000000100010 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 102, ts 4831701651, 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_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x457/0x940 lib/kobject_uevent.c:208
 store_uevent+0x16/0x30 kernel/module.c:1172
 module_attr_store+0x5f/0x80 kernel/params.c:905
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810f977300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810f977380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810f977400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88810f977480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810f977500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------

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 ffff88810f977400 by task syz.2.17/374

CPU: 1 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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:1336
 __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
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0xb70/0x29a0 kernel/exit.c:890
 do_group_exit+0x149/0x310 kernel/exit.c:1004
 get_signal+0x64f/0x1430 kernel/signal.c:2908
 arch_do_signal_or_restart+0xe2/0x1100 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 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: 0033:0x7febea1a4257
Code: Unable to access opcode bytes at RIP 0x7febea1a422d.
RSP: 002b:00007ffc9b26bbc0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 000055555643d500 RCX: 00007febea1a4257
RDX: 00007ffc9b26bc00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007febea280024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007febea470fac R14: 00007febea470fa0 R15: 00007febea470fa0
 </TASK>

Allocated by task 373:
 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:1923 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1940
 __do_sys_connect net/socket.c:1950 [inline]
 __se_sys_connect net/socket.c:1947 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1947
 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 ffff88810f977400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88810f977400, ffff88810f977600)
The buggy address belongs to the page:
page:ffffea00043e5d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f974
head:ffffea00043e5d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100042f00
raw: 0000000000000000 0000000000100010 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 102, ts 4831701651, 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_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x457/0x940 lib/kobject_uevent.c:208
 store_uevent+0x16/0x30 kernel/module.c:1172
 module_attr_store+0x5f/0x80 kernel/params.c:905
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88810f977300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810f977380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810f977400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88810f977480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810f977500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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