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kernel BUG at fs/inode.c:LINE!

Status: fixed on 2020/10/01 20:29
Reported-by: syzbot+de1acd8124232a3afac4@syzkaller.appspotmail.com
Fix commit: 37d933e8b41b fix regression in "epoll: Keep a reference on files added to the check list"
First crash: 1571d, last: 1542d
Fix bisection: fixed by (bisect log) :
commit 37d933e8b41b83bb8278815e366aec5a542b7e31
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed Sep 2 15:30:48 2020 +0000

  fix regression in "epoll: Keep a reference on files added to the check list"

  
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 kernel BUG in iput C error 2 977d 977d 2/2 fixed on 2022/03/29 10:01
linux-4.19 kernel BUG in iput C error 42 782d 1269d 0/1 upstream: reported C repro on 2021/06/01 01:19
linux-4.19 kernel BUG at fs/inode.c:LINE! (2) C done 5 1304d 1443d 1/1 fixed on 2021/05/29 15:40
linux-4.14 kernel BUG at fs/inode.c:LINE! 1 1656d 1656d 0/1 auto-closed as invalid on 2020/09/07 09:12
android-54 kernel BUG at fs/inode.c:LINE! C 5 1538d 1547d 0/2 auto-obsoleted due to no activity on 2023/04/15 08:56
upstream kernel BUG at fs/inode.c:LINE! autofs C done 2 2167d 2166d 12/28 fixed on 2019/04/12 21:13
upstream kernel BUG at fs/inode.c:LINE! (2) fs C done unreliable 322 198d 1546d 25/28 fixed on 2024/05/21 07:00

Sample crash report:
Bluetooth: hci0: command 0x041b tx timeout
Bluetooth: hci0: command 0x040f tx timeout
Bluetooth: hci0: command 0x0419 tx timeout
------------[ cut here ]------------
kernel BUG at fs/inode.c:1571!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12155 Comm: syz-executor.0 Not tainted 4.19.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:iput+0x727/0x860 fs/inode.c:1571
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 84 18 fd ff ff 48 8b 3c 24 e8 33 10 ef ff e9 0a fd ff ff e8 49 ef b8 ff <0f> 0b e8 42 ef b8 ff 48 89 ef e8 1a f7 ff ff 4c 89 f7 e8 12 c7 8c
RSP: 0018:ffff88808fc97da8 EFLAGS: 00010293
RAX: ffff88808e1da680 RBX: 0000000000000040 RCX: ffffffff81b0bb6e
RDX: 0000000000000000 RSI: ffffffff81b0c237 RDI: 0000000000000007
RBP: ffff88807c63a1b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807c63a1a8 R14: ffffffff85afcc50 R15: ffff8880a94f2a20
FS:  00007fb3f510f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a8660 CR3: 000000008bf44000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __sock_release+0x226/0x2a0 net/socket.c:591
 sock_close+0x15/0x20 net/socket.c:1140
 __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: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb3f510ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9
RAX: 0000000000000000 RBX: 0000000000002ac0 RCX: 000000000045d5b9
RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000005
RBP: 000000000118cf88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000040 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffe38ff1b8f R14: 00007fb3f510f9c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace bed1a4a147cff8bd ]---
RIP: 0010:iput+0x727/0x860 fs/inode.c:1571
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 84 18 fd ff ff 48 8b 3c 24 e8 33 10 ef ff e9 0a fd ff ff e8 49 ef b8 ff <0f> 0b e8 42 ef b8 ff 48 89 ef e8 1a f7 ff ff 4c 89 f7 e8 12 c7 8c
RSP: 0018:ffff88808fc97da8 EFLAGS: 00010293
RAX: ffff88808e1da680 RBX: 0000000000000040 RCX: ffffffff81b0bb6e
RDX: 0000000000000000 RSI: ffffffff81b0c237 RDI: 0000000000000007
RBP: ffff88807c63a1b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88807c63a1a8 R14: ffffffff85afcc50 R15: ffff8880a94f2a20
FS:  00007fb3f510f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a8660 CR3: 000000008bf44000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/01 11:29 linux-4.19.y f6d5cb9e2c06 d5a3ae1f .config console log report syz ci2-linux-4-19
2020/08/03 03:56 linux-4.19.y 13af6c74b14a 96dd3623 .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.