INFO: task hung in unlink_anon_vmas

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: e0f8b8a6 Linux 4.14.170
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16b9f029e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=633dd9db249084f5
dashboard link: https://syzkaller.appspot.com/bug?extid=099f98458bf92e06738f
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+099f98...@syzkaller.appspotmail.com

RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000001ca3
RBP: 000000c42dbd3628 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 0000000000000000
R13: 000000c42dbd3750 R14: 000000c42dbd3750 R15: 0000000000000000
INFO: task syz-executor.4:28996 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28928 28996 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f5f6cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c078 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c078
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c07c
R13: 00007ffe94e9a1bf R14: 00007fda7f5f79c0 R15: 000000000075c07c
INFO: task syz-executor.4:30127 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28928 30127 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f617cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe94e9a1bf R14: 00007fda7f6189c0 R15: 000000000075bfd4
INFO: task syz-executor.4:30391 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28928 30391 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f617cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe94e9a1bf R14: 00007fda7f6189c0 R15: 000000000075bfd4
INFO: task syz-executor.4:9633 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28792 9633 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f5d5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c120 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c120
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c124
R13: 00007ffe94e9a1bf R14: 00007fda7f5d69c0 R15: 000000000075c124
INFO: task syz-executor.4:9831 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28720 9831 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f5d5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c120 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c120
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c124
R13: 00007ffe94e9a1bf R14: 00007fda7f5d69c0 R15: 000000000075c124
INFO: task syz-executor.4:10092 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28792 10092 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f5d5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c120 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c120
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c124
R13: 00007ffe94e9a1bf R14: 00007fda7f5d69c0 R15: 000000000075c124
INFO: task syz-executor.4:10510 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28792 10510 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f5d5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075c120 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c120
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c124
R13: 00007ffe94e9a1bf R14: 00007fda7f5d69c0 R15: 000000000075c124
INFO: task syz-executor.4:11287 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29016 11287 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f617cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe94e9a1bf R14: 00007fda7f6189c0 R15: 000000000075bfd4
INFO: task syz-executor.4:11391 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29016 11391 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f617cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe94e9a1bf R14: 00007fda7f6189c0 R15: 000000000075bfd4
INFO: task syz-executor.4:11898 blocked for more than 140 seconds.
Not tainted 4.14.170-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29016 11898 7338 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384
schedule+0x92/0x1c0 kernel/sched/core.c:3428
__rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline]
rwsem_down_write_failed+0x5ce/0xb50 kernel/locking/rwsem-xadd.c:617
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
__down_write arch/x86/include/asm/rwsem.h:126 [inline]
down_write+0x53/0x90 kernel/locking/rwsem.c:56
lock_anon_vma_root mm/rmap.c:238 [inline]
unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
free_pgtables+0x183/0x2b0 mm/memory.c:643
exit_mmap+0x294/0x4e0 mm/mmap.c:3057
__mmput kernel/fork.c:930 [inline]
mmput+0x114/0x440 kernel/fork.c:951
exit_mm kernel/exit.c:545 [inline]
do_exit+0x952/0x2cd0 kernel/exit.c:845
do_group_exit+0x111/0x330 kernel/exit.c:955
get_signal+0x381/0x1cd0 kernel/signal.c:2418
do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45b399
RSP: 002b:00007fda7f617cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4
R13: 00007ffe94e9a1bf R14: 00007fda7f6189c0 R15: 000000000075bfd4

Showing all locks held in the system:
1 lock held by khungtaskd/1057:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81488cf8>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4544
2 locks held by getty/7290:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7291:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7292:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7293:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7294:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7295:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
2 locks held by getty/7296:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff866928d3>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff834c38d6>] n_tty_read+0x1e6/0x17d0 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.4/28996:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/30127:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/30391:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.2/32427:
#0: (&sb->s_type->i_mutex_key#11){+.+.}, at: [<ffffffff85167e89>] inode_lock include/linux/fs.h:718 [inline]
#0: (&sb->s_type->i_mutex_key#11){+.+.}, at: [<ffffffff85167e89>] __sock_release+0x89/0x2b0 net/socket.c:601
1 lock held by syz-executor.2/32444:
#0: (&sb->s_type->i_mutex_key#11){+.+.}, at: [<ffffffff85167e89>] inode_lock include/linux/fs.h:718 [inline]
#0: (&sb->s_type->i_mutex_key#11){+.+.}, at: [<ffffffff85167e89>] __sock_release+0x89/0x2b0 net/socket.c:601
1 lock held by syz-executor.4/9633:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/9831:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/10092:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/10510:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/11287:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/11391:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/11898:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/11920:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/11994:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12041:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12086:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12123:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12140:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12465:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/12573:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
2 locks held by kworker/0:0/14143:
#0: ("events"){+.+.}, at: [<ffffffff813d223e>] work_static include/linux/workqueue.h:199 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813d223e>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813d223e>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813d223e>] process_one_work+0x76e/0x1600 kernel/workqueue.c:2085
#1: (key_gc_work){+.+.}, at: [<ffffffff813d227b>] process_one_work+0x7ab/0x1600 kernel/workqueue.c:2089
1 lock held by syz-executor.4/22379:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/22399:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24378:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24555:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24809:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24889:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24954:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/24988:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25239:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25402:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25476:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25521:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25746:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25841:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/25971:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26013:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26184:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26269:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26318:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26367:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26405:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26483:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26529:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26572:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26651:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26720:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26756:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/26955:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27039:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27138:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27497:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27553:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27580:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27617:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27766:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27834:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/27934:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/28048:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/28105:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/28737:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/28786:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.4/28840:
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] lock_anon_vma_root mm/rmap.c:238 [inline]
#0: (&anon_vma->rwsem){++++}, at: [<ffffffff8180b7b4>] unlink_anon_vmas+0x184/0x800 mm/rmap.c:388
1 lock held by syz-executor.2/30698:
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f6c84>] nfnl_lock+0x24/0x30 net/netfilter/nfnetlink.c:61
1 lock held by syz-executor.4/30722:
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnl_lock net/netfilter/nfnetlink.c:61 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:303 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:495 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv+0x54e/0x1650 net/netfilter/nfnetlink.c:513
1 lock held by syz-executor.5/30732:
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnl_lock net/netfilter/nfnetlink.c:61 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:303 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:495 [inline]
#0: (&table[i].mutex){+.+.}, at: [<ffffffff853f791e>] nfnetlink_rcv+0x54e/0x1650 net/netfilter/nfnetlink.c:513

=============================================



---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.