general protection fault in list_lru_del

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 13af6c74 Linux 4.19.136
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10071aa4900000
kernel config: https://syzkaller.appspot.com/x/.config?x=5b7578d3b5457a49
dashboard link: https://syzkaller.appspot.com/bug?extid=9c4a4351802de72fd74b
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+9c4a43...@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8509 Comm: syz-executor.4 Not tainted 4.19.136-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x81/0xef lib/list_debug.c:51
Code: 0f 84 df 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 51 49 8b 14 24 48 39 ea 0f 85 97 00 00 00 49 8d 7d
RSP: 0018:ffff8882112a7c88 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888000805358 RCX: ffffffff815255bb
RDX: 0000000000000000 RSI: ffffffff81912ecf RDI: ffff888000805360
RBP: ffff888000805358 R08: 0000000000000001 R09: ffffed1015281eb8
R10: ffff8880a940f5c3 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888000805360 R15: ffff8880008051e8
FS: 0000000001a01940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c2f000 CR3: 00000000a03b7000 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]
list_lru_del+0x11b/0x570 mm/list_lru.c:156
inode_lru_list_del fs/inode.c:434 [inline]
iput_final fs/inode.c:1552 [inline]
iput+0x4c0/0x860 fs/inode.c:1581
dentry_unlink_inode+0x265/0x320 fs/dcache.c:374
d_delete+0x210/0x280 fs/dcache.c:2370
__debugfs_remove.part.0+0xb9/0x1b0 fs/debugfs/inode.c:656
__debugfs_remove include/linux/dcache.h:322 [inline]
debugfs_remove_recursive fs/debugfs/inode.c:763 [inline]
debugfs_remove_recursive+0x37a/0x4c0 fs/debugfs/inode.c:709
kvm_vcpu_release+0x58/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2638
__fput+0x2ce/0x890 fs/file_table.c:278
task_work_run+0x148/0x1c0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:193 [inline]
exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4167f1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff2097a800 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00000000004167f1
RDX: 0000000000000000 RSI: ffffffff873cf158 RDI: 0000000000000005
RBP: 0000000000000001 R08: ffffffff81020e9b R09: 0000000068e3f068
R10: 00007fff2097a8f0 R11: 0000000000000293 R12: 000000000078c900
R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c04c
Modules linked in:
---[ end trace be083b257a7244d5 ]---
RIP: 0010:__list_del_entry_valid+0x81/0xef lib/list_debug.c:51
Code: 0f 84 df 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 51 49 8b 14 24 48 39 ea 0f 85 97 00 00 00 49 8d 7d
RSP: 0018:ffff8882112a7c88 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888000805358 RCX: ffffffff815255bb
RDX: 0000000000000000 RSI: ffffffff81912ecf RDI: ffff888000805360
RBP: ffff888000805358 R08: 0000000000000001 R09: ffffed1015281eb8
R10: ffff8880a940f5c3 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888000805360 R15: ffff8880008051e8
FS: 0000000001a01940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c2f000 CR3: 00000000a03b7000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

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