syzbot


kernel BUG in bch2_fs_release

Status: fixed on 2024/06/11 03:41
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+a8074a75b8d73328751e@syzkaller.appspotmail.com
Fix commit: d509cadc3a48 bcachefs: Fix debug assert
First crash: 26d, last: 17d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_fs_release 0 (1) 2024/05/25 03:50

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/bcachefs/super.c:567!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 3 PID: 5225 Comm: syz-executor.0 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__bch2_fs_free fs/bcachefs/super.c:567 [inline]
RIP: 0010:bch2_fs_release+0x6b0/0x810 fs/bcachefs/super.c:603
Code: 89 ee e8 73 ab 79 fd 48 85 ed 75 34 e8 39 b0 79 fd 31 ff 4c 89 ee e8 5f ab 79 fd 4d 85 ed 0f 84 02 fc ff ff e8 21 b0 79 fd 90 <0f> 0b e8 19 b0 79 fd 48 8b 7c 24 10 e8 7f 5d d9 ff e9 cb fa ff ff
RSP: 0018:ffffc90002b0fd30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888057480068 RCX: ffffffff8414cf41
RDX: ffff88801e0ec880 RSI: ffffffff8414cf4f RDI: 0000000000000007
RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000017 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000017 R14: dffffc0000000000 R15: 0000000000000017
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:0000000056fc2400
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7417a78 CR3: 0000000052830000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1fa/0x5b0 lib/kobject.c:737
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf733d579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000fff4a4f8 EFLAGS: 00000292 ORIG_RAX: 0000000000000034
RAX: 0000000000000000 RBX: 00000000fff4a5a0 RCX: 0000000000000009
RDX: 00000000f7493ff4 RSI: 00000000f73e4361 RDI: 00000000fff4b644
RBP: 00000000fff4a5a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bch2_fs_free fs/bcachefs/super.c:567 [inline]
RIP: 0010:bch2_fs_release+0x6b0/0x810 fs/bcachefs/super.c:603
Code: 89 ee e8 73 ab 79 fd 48 85 ed 75 34 e8 39 b0 79 fd 31 ff 4c 89 ee e8 5f ab 79 fd 4d 85 ed 0f 84 02 fc ff ff e8 21 b0 79 fd 90 <0f> 0b e8 19 b0 79 fd 48 8b 7c 24 10 e8 7f 5d d9 ff e9 cb fa ff ff
RSP: 0018:ffffc90002b0fd30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888057480068 RCX: ffffffff8414cf41
RDX: ffff88801e0ec880 RSI: ffffffff8414cf4f RDI: 0000000000000007
RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000017 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000017 R14: dffffc0000000000 R15: 0000000000000017
FS:  0000000000000000(0000) GS:ffff88802c300000(0063) knlGS:0000000056fc2400
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7417a78 CR3: 0000000052830000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/30 00:54 upstream 4a4be1ad3a6e c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in bch2_fs_release
2024/05/29 12:24 upstream e0cce98fe279 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in bch2_fs_release
2024/05/21 03:41 upstream 6e51b4b5bbc0 c2e07261 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in bch2_fs_release
* Struck through repros no longer work on HEAD.