kernel BUG at fs/inode.c:LINE!

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: ab9dfda2 Linux 4.14.180
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=160c7d34100000
kernel config: https://syzkaller.appspot.com/x/.config?x=221566a7407ce2de
dashboard link: https://syzkaller.appspot.com/bug?extid=a1ffb52cca67ff5095a2
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+a1ffb5...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/inode.c:509!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6354 Comm: syz-executor.1 Not tainted 4.14.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88809cd00000 task.stack: ffff8880a9008000
RIP: 0010:clear_inode+0x155/0x1b0 fs/inode.c:509
RSP: 0018:ffff8880a900fc98 EFLAGS: 00010097
RAX: ffff88809cd00000 RBX: ffff888000800530 RCX: 000000008395dfd0
RDX: 0000000000000000 RSI: ffff88809cd00888 RDI: ffff888000800828
RBP: ffff888000800758 R08: 0000000000004ae1 R09: ffffffff8a084f48
R10: ffff88809cd00888 R11: ffff88809cd00000 R12: ffff888000800608
R13: ffff888000800558 R14: ffffffff8737a860 R15: 0000000000000001
FS: 000000000250c940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000073b138 CR3: 0000000097447000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
evict+0x4a1/0x5f0 fs/inode.c:558
iput_final fs/inode.c:1524 [inline]
iput fs/inode.c:1551 [inline]
iput+0x457/0x8d0 fs/inode.c:1536
dentry_unlink_inode+0x26e/0x330 fs/dcache.c:387
__dentry_kill+0x320/0x550 fs/dcache.c:591
dentry_kill fs/dcache.c:632 [inline]
dput.part.0+0x578/0x710 fs/dcache.c:847
dput+0x1b/0x30 fs/dcache.c:811
__fput+0x445/0x790 fs/file_table.c:228
task_work_run+0x113/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1d6/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416400
RSP: 002b:00007ffd3a687088 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000416400
RDX: 00000000000000e0 RSI: 00007ffd3a687150 RDI: 0000000000000003
RBP: 00007ffd3a6870a0 R08: 00007ffd3a68709c R09: 000000000000000a
R10: 00007ffd3a6870a0 R11: 0000000000000246 R12: 0000000000000003
R13: 000000000073c4c0 R14: 000000000073bdc8 R15: 0000000000001380
Code: 03 80 3c 02 00 75 74 48 8b 83 c0 01 00 00 48 39 c5 75 36 e8 ae 4c c9 ff 48 c7 83 d8 00 00 00 60 00 00 00 5b 5d c3 e8 9b 4c c9 ff <0f> 0b e8 94 4c c9 ff 0f 0b e8 8d 4c c9 ff 0f 0b e8 86 4c c9 ff
RIP: clear_inode+0x155/0x1b0 fs/inode.c:509 RSP: ffff8880a900fc98
---[ end trace 8e10d1ed534cf52b ]---


---
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.