BUG: corrupted list in evict

BUG: corrupted list in evict

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    d31958b3 Add linux-next specific files for 20200710
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1050b2af100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3fe4fccb94cbc1a6
dashboard link: https://syzkaller.appspot.com/bug?extid=2677e2f48b47153e3838
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+2677e2f48b47153e3838@syzkaller.appspotmail.com

list_del corruption. next->prev should be ffff88808970f818, but was 0000000000000000
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:54!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7059 Comm: syz-executor.3 Not tainted 5.8.0-rc4-next-20200710-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold+0x48/0x55 lib/list_debug.c:54
Code: e8 a1 71 c0 fd 0f 0b 4c 89 e2 48 89 ee 48 c7 c7 e0 db 93 88 e8 8d 71 c0 fd 0f 0b 48 89 ee 48 c7 c7 a0 dc 93 88 e8 7c 71 c0 fd <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55
RSP: 0018:ffffc90003ed7958 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff88808970f818 RCX: 0000000000000000
RDX: ffff88805e3401c0 RSI: ffffffff815d7e07 RDI: fffff520007daf1d
RBP: ffff88808970f818 R08: 0000000000000054 R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880494b5c60
R13: ffff88800082e290 R14: ffffffff88598f60 R15: ffff88808970f728
FS:  0000000001ce5940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ca3b72 CR3: 00000000a1033000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:132 [inline]
 list_del_init include/linux/list.h:204 [inline]
 inode_sb_list_del fs/inode.c:471 [inline]
 evict+0x181/0x750 fs/inode.c:565
 iput_final fs/inode.c:1652 [inline]
 iput.part.0+0x424/0x850 fs/inode.c:1678
 iput+0x58/0x70 fs/inode.c:1668
 proc_invalidate_siblings_dcache+0x28d/0x600 fs/proc/inode.c:160
 release_task+0xc63/0x14d0 kernel/exit.c:221
 wait_task_zombie kernel/exit.c:1088 [inline]
 wait_consider_task+0x2fb3/0x3b20 kernel/exit.c:1315
 do_wait_thread kernel/exit.c:1378 [inline]
 do_wait+0x36a/0x9e0 kernel/exit.c:1449
 kernel_wait4+0x14c/0x260 kernel/exit.c:1604
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1616
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4169ca
Code: Bad RIP value.
RSP: 002b:00007ffc79eed098 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000000f83dc RCX: 00000000004169ca
RDX: 0000000040000001 RSI: 00007ffc79eed0d0 RDI: ffffffffffffffff
RBP: 00000000000018e5 R08: 0000000000000001 R09: 0000000001ce5940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ffc79eed0d0 R14: 00000000000f838e R15: 00007ffc79eed0e0
Modules linked in:
---[ end trace 532812e394e0dae0 ]---
RIP: 0010:__list_del_entry_valid.cold+0x48/0x55 lib/list_debug.c:54
Code: e8 a1 71 c0 fd 0f 0b 4c 89 e2 48 89 ee 48 c7 c7 e0 db 93 88 e8 8d 71 c0 fd 0f 0b 48 89 ee 48 c7 c7 a0 dc 93 88 e8 7c 71 c0 fd <0f> 0b cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 55 41 54 55
RSP: 0018:ffffc90003ed7958 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff88808970f818 RCX: 0000000000000000
RDX: ffff88805e3401c0 RSI: ffffffff815d7e07 RDI: fffff520007daf1d
RBP: ffff88808970f818 R08: 0000000000000054 R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880494b5c60
R13: ffff88800082e290 R14: ffffffff88598f60 R15: ffff88808970f728
FS:  0000000001ce5940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000ca3b72 CR3: 00000000a1033000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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