BUG: corrupted list in evict

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d7e78d08 Linux 4.14.195
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=173c1549900000
kernel config: https://syzkaller.appspot.com/x/.config?x=6608b656f49b4e8c
dashboard link: https://syzkaller.appspot.com/bug?extid=13703db96cbf19bb034f
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+13703d...@syzkaller.appspotmail.com

list_del corruption. prev->next should be ffff88805de2ba20, but was (null)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6347 Comm: syz-executor.0 Not tainted 4.14.195-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888094a8e140 task.stack: ffff888084570000
RIP: 0010:__list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51
RSP: 0018:ffff888084577d50 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff88805de2ba20 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888094a8e9f0 RDI: ffffed10108aefa0
RBP: ffff88805de2ba20 R08: 0000000000000054 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88800041a7e0
R13: ffff8880440b66a0 R14: ffffffff86b94760 R15: ffff88805de2ba28
FS: 0000000002b8d940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00bcff000 CR3: 00000000933dc000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__list_del_entry include/linux/list.h:117 [inline]
list_del_init include/linux/list.h:159 [inline]
inode_sb_list_del fs/inode.c:449 [inline]
evict+0x178/0x700 fs/inode.c:544
iput_final fs/inode.c:1524 [inline]
iput+0x458/0x7e0 fs/inode.c:1551
do_unlinkat+0x35b/0x5c0 fs/namei.c:4098
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45d307
RSP: 002b:00007ffdff9935c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d307
RDX: 00007ffdff9935e0 RSI: 00007ffdff9935e0 RDI: 00007ffdff993670
RBP: 00000000000013c0 R08: 0000000000000000 R09: 0000000000000011
R10: 000000000000000a R11: 0000000000000246 R12: 00007ffdff994700
R13: 0000000002b8ea60 R14: 0000000000000000 R15: 00007ffdff994700
Code: 86 e8 dc 9d 44 fe 0f 0b 48 89 f1 48 c7 c7 c0 62 e4 86 4c 89 e6 e8 c8 9d 44 fe 0f 0b 48 89 ee 48 c7 c7 60 64 e4 86 e8 b7 9d 44 fe <0f> 0b 4c 89 ea 48 89 ee 48 c7 c7 a0 63 e4 86 e8 a3 9d 44 fe 0f
RIP: __list_del_entry_valid.cold+0xf/0x55 lib/list_debug.c:51 RSP: ffff888084577d50
---[ end trace a7626d85e745f309 ]---


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[syzbot]

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