Extracting prog: 25.756934137s
Minimizing prog: 13m36.358847007s
Simplifying prog options: 0s
Extracting C: 34.347958991s
Simplifying C: 5m2.94200836s


extracting reproducer from 36 programs
testing a last program of every proc
single: executing 7 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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE-ioctl$PPPIOCATTCHAN-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-mmap-madvise-flistxattr
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={<r3=>r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})
ioctl$PPPIOCATTCHAN(r3, 0x40047438, &(0x7f0000000600)=0x2)
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x3, 0x7, &(0x7f0000000040)=0x1)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000000, 0x100010, r2, 0xb7e36000)
madvise(&(0x7f0000000000/0x600000)=nil, 0x600002, 0x9)
flistxattr(r2, 0x0, 0x0)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
single: successfully extracted reproducer
found reproducer with 15 syscalls
minimizing guilty program
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE-ioctl$PPPIOCATTCHAN-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-mmap-madvise
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={<r3=>r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})
ioctl$PPPIOCATTCHAN(r3, 0x40047438, &(0x7f0000000600)=0x2)
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x3, 0x7, &(0x7f0000000040)=0x1)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000000, 0x100010, r2, 0xb7e36000)
madvise(&(0x7f0000000000/0x600000)=nil, 0x600002, 0x9)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE-ioctl$PPPIOCATTCHAN-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-mmap
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={<r3=>r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})
ioctl$PPPIOCATTCHAN(r3, 0x40047438, &(0x7f0000000600)=0x2)
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x3, 0x7, &(0x7f0000000040)=0x1)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x1000000, 0x100010, r2, 0xb7e36000)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE-ioctl$PPPIOCATTCHAN-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={<r3=>r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})
ioctl$PPPIOCATTCHAN(r3, 0x40047438, &(0x7f0000000600)=0x2)
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x3, 0x7, &(0x7f0000000040)=0x1)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE-ioctl$PPPIOCATTCHAN
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={<r3=>r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})
ioctl$PPPIOCATTCHAN(r3, 0x40047438, &(0x7f0000000600)=0x2)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-ioctl$XFS_IOC_PATH_TO_HANDLE
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480)={<r2=>0xffffffffffffffff})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))
ioctl$XFS_IOC_PATH_TO_HANDLE(r0, 0xc0385869, &(0x7f00000005c0)={r2, &(0x7f0000000080)='\x00', 0x24080, &(0x7f0000000280)={@_ha_fsid={[0x56, 0x1]}, {0x9, 0x5, 0x7fff, 0x8}}, 0x10, &(0x7f00000002c0), &(0x7f0000000580)=0x4})

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480))
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x8, 0x4, &(0x7f0000006680))

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS-socketpair$unix
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)
socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000480))

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-writev
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
writev(r0, &(0x7f0000000300)=[{0x0}, {&(0x7f0000001240)="7b62945da65d934746c62127fe5f8dea297500d531af3d82a6660c404efb3d6218b5705af0b3cf2f446282ea5a43626f311c3caac11af2273194a7c9792a95245285c1b081d57c759398e010e28c3ff1ad6a39397eb54c7bd56354a5655fa08b143dd80e1ffd976335fdba870f53439b6b75c24eb44b44c28fb21a922d23ac3acee7955767f0ede9e6d818fa8b9f7b0042c00afd311a964b8aeec39c5a6ff0589ba532823880b47da1c86d22c0fb882b70e5cd3e59954a2b699ee1a4dab4139a11ab8a2c071c01aa7ee90d0153ff81185d437d4aa3700d9a73", 0xfdef}, {0x0}], 0x3)

program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$inet6-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$inet6(r1, &(0x7f00000000c0)={0xa, 0x4e20, 0xfffffffc, @dev={0xfe, 0x80, '\x00', 0x31}, 0xa}, 0x1c)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-preadv-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.409183219s, {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$pppl2tp-preadv-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
preadv(r0, &(0x7f0000002600)=[{&(0x7f0000000100)=""/254, 0xfe}, {&(0x7f0000000200)=""/20, 0x14}, {&(0x7f0000000340)=""/224, 0xe0}, {&(0x7f0000000440)=""/48, 0x30}, {&(0x7f00000004c0)=""/168, 0xa8}, {&(0x7f0000001340)=""/4096, 0x1000}, {&(0x7f0000002340)=""/245, 0xf5}, {&(0x7f0000002440)=""/152, 0x98}, {&(0x7f0000002500)=""/32, 0x20}, {&(0x7f0000002540)=""/150, 0x96}], 0xa, 0x401, 0x2)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, 0xffffffffffffffff, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.409183219s, {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$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(0xffffffffffffffff, 0x40047459, &(0x7f0000000000)=0x2014400)

program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, 0x0, 0x0)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, &(0x7f0000000000)=0x2014400)

program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
extracting C reproducer
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
simplifying C reproducer
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program did not crash
testing compiled C program (duration=33.409183219s, {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:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
program did not crash
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=33.409183219s, {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$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$PPPIOCSFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000240)=@pppol2tpin6={0x18, 0x1, {0x0, r1, 0x4, 0x0, 0x0, 0x0, {0xa, 0x4e22, 0xffff, @ipv4={'\x00', '\xff\xff', @empty}}}}, 0x32)
ioctl$PPPIOCSFLAGS(r0, 0x40047459, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
reproducing took 22m44.886789939s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline]
BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:176 [inline]
BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 kernel/locking/mutex.c:295
Write of size 8 at addr ffff888121885d50 by task syz.2.17/375

CPU: 0 PID: 375 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+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline]
 __mutex_trylock_fast kernel/locking/mutex.c:176 [inline]
 mutex_lock+0x86/0x1b0 kernel/locking/mutex.c:295
 pppol2tp_release+0x178/0x2b0 net/l2tp/l2tp_ppp.c:441
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f194079e0d9
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:00007ffc0e9f9148 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc0e9f9230 RCX: 00007f194079e0d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006838 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1940a25fac R14: 00007f1940a25fa8 R15: 00007f1940a25fa0
 </TASK>

Allocated by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 l2tp_session_create+0x38/0xbd0 net/l2tp/l2tp_core.c:1609
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:771
 __sys_connect_file net/socket.c:2000 [inline]
 __sys_connect+0x3da/0x460 net/socket.c:2017
 __do_sys_connect net/socket.c:2027 [inline]
 __se_sys_connect net/socket.c:2024 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2024
 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3df/0x4d0 net/l2tp/l2tp_core.c:1582
 pppol2tp_release+0x169/0x2b0 net/l2tp/l2tp_ppp.c:438
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888121885c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 336 bytes inside of
 512-byte region [ffff888121885c00, ffff888121885e00)

The buggy address belongs to the physical page:
page:ffffea0004862100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121884
head:ffffea0004862100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 43, tgid 43 (kworker/u4:2), ts 26697877544, free_ts 25939270180
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1322 [inline]
 nlmsg_new include/net/netlink.h:987 [inline]
 inet_netconf_notify_devconf+0x169/0x220 net/ipv4/devinet.c:2128
 __devinet_sysctl_unregister net/ipv4/devinet.c:2639 [inline]
 devinet_exit_net+0x10e/0x220 net/ipv4/devinet.c:2778
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
 __vfree mm/vmalloc.c:2788 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2819
 kcov_put kernel/kcov.c:437 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:533
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303

Memory state around the buggy address:
 ffff888121885c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888121885c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888121885d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888121885d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888121885e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline]
BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:176 [inline]
BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 kernel/locking/mutex.c:295
Write of size 8 at addr ffff888121885d50 by task syz.2.17/375

CPU: 0 PID: 375 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+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1779 [inline]
 __mutex_trylock_fast kernel/locking/mutex.c:176 [inline]
 mutex_lock+0x86/0x1b0 kernel/locking/mutex.c:295
 pppol2tp_release+0x178/0x2b0 net/l2tp/l2tp_ppp.c:441
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f194079e0d9
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:00007ffc0e9f9148 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffc0e9f9230 RCX: 00007f194079e0d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000006838 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1940a25fac R14: 00007f1940a25fa8 R15: 00007f1940a25fa0
 </TASK>

Allocated by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 l2tp_session_create+0x38/0xbd0 net/l2tp/l2tp_core.c:1609
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:771
 __sys_connect_file net/socket.c:2000 [inline]
 __sys_connect+0x3da/0x460 net/socket.c:2017
 __do_sys_connect net/socket.c:2027 [inline]
 __se_sys_connect net/socket.c:2024 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2024
 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 375:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3df/0x4d0 net/l2tp/l2tp_core.c:1582
 pppol2tp_release+0x169/0x2b0 net/l2tp/l2tp_ppp.c:438
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888121885c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 336 bytes inside of
 512-byte region [ffff888121885c00, ffff888121885e00)

The buggy address belongs to the physical page:
page:ffffea0004862100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121884
head:ffffea0004862100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 43, tgid 43 (kworker/u4:2), ts 26697877544, free_ts 25939270180
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa1/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x226/0x4a0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1322 [inline]
 nlmsg_new include/net/netlink.h:987 [inline]
 inet_netconf_notify_devconf+0x169/0x220 net/ipv4/devinet.c:2128
 __devinet_sysctl_unregister net/ipv4/devinet.c:2639 [inline]
 devinet_exit_net+0x10e/0x220 net/ipv4/devinet.c:2778
 ops_exit_list net/core/net_namespace.c:172 [inline]
 cleanup_net+0x5b0/0xb10 net/core/net_namespace.c:604
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
 __vfree mm/vmalloc.c:2788 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2819
 kcov_put kernel/kcov.c:437 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:533
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303

Memory state around the buggy address:
 ffff888121885c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888121885c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888121885d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888121885d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888121885e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================