syzbot

 sign-in | mailing list | source | docs
🐞 Open [120]
🐞 Fixed [2]
🐞 Invalid [223]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

kernel BUG in submit_bh_wbc

Status: upstream: reported C repro on 2023/06/15 00:20
Bug presence: origin:lts
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+807c663f72dcf074e3e2@syzkaller.appspotmail.com
First crash: 963d, last: 1h46m
Cause bisection: introduced by (bisect log) :
commit 8d5459c11f548131ce48b2fbf45cccc5c382558f
Author: Jan Kara <jack@suse.cz>
Date: Fri May 20 11:14:02 2022 +0000

  ext4: improve write performance with disabled delalloc

Crash: kernel BUG in submit_bh_wbc (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit 32b9fb9a67ec70bbe3afe931b0ea44203150a49a
Author: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Date: Mon Sep 18 10:45:50 2023 +0000

  ext4: mark buffer new if it is unwritten to avoid stale data exposure

  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/03/17 lts (merge base) 883d1a956208 C [report] kernel BUG in submit_bh_wbc
2024/03/31 upstream (ToT) 18737353cca0 C Didn't crash
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 kernel BUG in submit_bh_wbc origin:lts-only -1 C done 19 606d 1034d 3/3 fixed on 2024/07/20 06:27
upstream kernel BUG at fs/buffer.c:LINE! nilfs -1 C done error 567 664d 2846d 25/29 fixed on 2024/04/10 03:59
upstream kernel BUG in submit_bh_wbc (2) udf -1 C done 123 543d 648d 27/29 fixed on 2024/08/14 03:44
linux-4.14 kernel BUG at fs/buffer.c:LINE! -1 C error 59 1078d 2473d 0/1 upstream: reported C repro on 2019/04/27 19:47
linux-6.1 kernel BUG in submit_bh_wbc (2) origin:lts-only -1 C inconclusive 250 5m 556d 0/3 upstream: reported C repro on 2024/07/26 16:49
linux-4.19 kernel BUG at fs/buffer.c:LINE! (2) udf ext4 -1 C error 31 1085d 1899d 0/1 upstream: reported C repro on 2020/11/21 07:48
android-54 kernel BUG at fs/buffer.c:LINE! ext4 -1 C 4762 254d 2204d 0/2 upstream: reported C repro on 2020/01/21 13:12
upstream kernel BUG in submit_bh_wbc (3) nilfs fs -1 C done 18 469d 476d 28/29 fixed on 2024/11/12 23:31
linux-5.15 kernel BUG in submit_bh_wbc -1 C error 8 696d 974d 0/3 auto-obsoleted due to no activity on 2024/06/16 14:58
upstream kernel BUG in submit_bh_wbc nilfs -1 C done 10 649d 658d 25/29 fixed on 2024/04/24 18:26
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/03/11 21:14 3h12m bisect fix android14-6.1 OK (1) job log
2023/07/28 15:24 1h02m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/buffer.c:2714!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 470 Comm: kmmpd-loop0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:submit_bh_wbc+0x4c9/0x4f0 fs/buffer.c:2714
Code: c3 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c bd fe ff ff 48 89 df e8 18 36 e8 ff e9 b0 fe ff ff e8 8e d1 a3 ff 0f 0b e8 87 d1 a3 ff <0f> 0b e8 80 d1 a3 ff 0f 0b e8 79 d1 a3 ff 0f 0b e8 72 d1 a3 ff 0f
RSP: 0018:ffffc90000e17ca0 EFLAGS: 00010293
RAX: ffffffff81cc37d9 RBX: 0000000000000000 RCX: ffff88811d035100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e17cf0 R08: dffffc0000000000 R09: ffffed1021d73055
R10: ffffed1021d73055 R11: 1ffff11021d73054 R12: 0000000000000000
R13: 1ffff11021d73054 R14: ffff88810eb982a0 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32c63fff CR3: 00000001117ec000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 submit_bh+0x1f/0x30 fs/buffer.c:2755
 write_mmp_block_thawed+0x34a/0x4c0 fs/ext4/mmp.c:51
 write_mmp_block+0x138/0x2b0 fs/ext4/mmp.c:67
 kmmpd+0x215/0x950 fs/ext4/mmp.c:246
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x4c9/0x4f0 fs/buffer.c:2714
Code: c3 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c bd fe ff ff 48 89 df e8 18 36 e8 ff e9 b0 fe ff ff e8 8e d1 a3 ff 0f 0b e8 87 d1 a3 ff <0f> 0b e8 80 d1 a3 ff 0f 0b e8 79 d1 a3 ff 0f 0b e8 72 d1 a3 ff 0f
RSP: 0018:ffffc90000e17ca0 EFLAGS: 00010293
RAX: ffffffff81cc37d9 RBX: 0000000000000000 RCX: ffff88811d035100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000e17cf0 R08: dffffc0000000000 R09: ffffed1021d73055
R10: ffffed1021d73055 R11: 1ffff11021d73054 R12: 0000000000000000
R13: 1ffff11021d73054 R14: ffff88810eb982a0 R15: 0000000000003801
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb976456000 CR3: 000000011e4c5000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2364):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/03 13:39 android14-6.1 79ccb6ecf51e 96a211bc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/07/12 10:38 android14-6.1 e2deb0b42a3a 3cda49cf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/06/15 19:48 android14-6.1 6246d345f550 5f4b362d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/06/08 14:58 android14-6.1 7af56ffc913d 4826c28e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/05/25 16:07 android14-6.1 3c6d0251e1fb ed351ea7 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/01/26 16:54 android14-6.1 ef4fb40b87a9 9fbd772e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/12/16 06:57 android14-6.1 22b7ded8b55b 7cbfbb3a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/11/30 07:55 android14-6.1 a887a44ace2a 68914665 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/11/21 19:03 android14-6.1 51bee181735e 4b25d554 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/10/08 00:13 android14-6.1 0e8b65e41ffd d7906eff .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/09/25 06:24 android14-6.1 5c7d0d4f4a38 5643e0e9 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/08/20 20:36 android14-6.1 edca080b95df 9f0ab3fb .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2024/03/17 12:15 android14-6.1 ef39f76e4d24 d615901c .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2023/10/24 12:09 android14-6.1 8a67c0609445 af8d2e46 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2023/09/24 09:56 android14-6.1 060ebb378d1c 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2023/06/15 00:46 android14-6.1 60662882b7bd 76decb82 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2023/06/15 00:18 android14-6.1 60662882b7bd 76decb82 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/02/02 20:13 android14-6.1 478ca7133d0e 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/02/02 12:04 android14-6.1 478ca7133d0e 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/02/02 06:20 android14-6.1 478ca7133d0e 6b8752f2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/31 22:28 android14-6.1 defbecba6f63 afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/31 17:53 android14-6.1 defbecba6f63 afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/31 12:19 android14-6.1 defbecba6f63 afc0c4d4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/29 05:36 android14-6.1 28238b5ea70e 0adc945e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/27 04:50 android14-6.1 f073493a3225 efb3e894 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/26 15:33 android14-6.1 5b3c238664a9 a4c52dd6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/25 19:20 android14-6.1 5b3c238664a9 40acda8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/24 18:41 android14-6.1 f282db65d7e9 40acda8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/24 09:53 android14-6.1 f282db65d7e9 40acda8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/24 00:41 android14-6.1 f282db65d7e9 4f25b9b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/22 16:46 android14-6.1 c298d33764cb 82c9c083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/22 04:35 android14-6.1 c298d33764cb a16aed1d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/20 21:15 android14-6.1 1c6403722ffe 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/20 09:42 android14-6.1 1c6403722ffe 06648d9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/19 21:34 android14-6.1 37a76cbe8f87 572effc1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/19 08:29 android14-6.1 37a76cbe8f87 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/19 07:11 android14-6.1 37a76cbe8f87 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/18 19:30 android14-6.1 37a76cbe8f87 20d37d28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/11 23:46 android14-6.1 4472ce9a8930 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/10 20:29 android14-6.1 4472ce9a8930 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/09 11:53 android14-6.1 68876f5c7044 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/07 16:59 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/07 12:17 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/05 17:54 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/04 20:49 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/04 15:46 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/04 11:59 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/03 08:36 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/03 00:55 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/02 07:20 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2026/01/01 06:10 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/31 12:37 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/31 11:20 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/30 16:21 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/29 12:12 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/28 17:18 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/28 06:42 android14-6.1 5e6db7045704 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/24 20:47 android14-6.1 6da82810f8a5 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/24 07:31 android14-6.1 4a1b1bac83d6 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/23 18:26 android14-6.1 717175224587 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2025/12/21 20:20 android14-6.1 72ada78f601d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
2023/06/15 00:02 android14-6.1 60662882b7bd 76decb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in submit_bh_wbc
* Struck through repros no longer work on HEAD.