syzbot

 sign-in | mailing list | source | docs
🐞 Open [1413]
≡ Subsystems
🐞 Fixed [5827]
🐞 Invalid [14217]
⬇ Missing Backports [92]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

kernel panic: hung_task: blocked tasks (2)

Status: upstream: reported C repro on 2023/07/21 20:48
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+607aa822c60b2e75b269@syzkaller.appspotmail.com
First crash: 492d, last: 4d00h
Cause bisection: introduced by (bisect log) :
commit 9c8ad7a2ff0bfe58f019ec0abc1fb965114dde7d
Author: David Howells <dhowells@redhat.com>
Date: Thu May 16 11:52:27 2019 +0000

  uapi, x86: Fix the syscall numbering of the mount API syscalls [ver #2]

Crash: BUG: unable to handle kernel NULL pointer dereference in gfs2_glock_hold (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [gfs2?] kernel panic: hung_task: blocked tasks (2) 2 (4) 2023/07/28 11:48
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel panic: hung_task: blocked tasks kernel 4 2426d 2426d 0/28 closed as invalid on 2018/04/01 11:45
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2024/11/17 04:05 20m retest repro upstream report log
2024/11/17 04:05 24m retest repro upstream OK log
2024/11/17 04:05 24m retest repro upstream OK log
2024/11/17 04:05 32m retest repro upstream report log
2024/11/17 04:05 29m retest repro upstream report log
2024/10/16 02:25 22m retest repro upstream report log
2024/10/16 02:25 21m retest repro upstream report log
2024/10/16 02:25 18m retest repro upstream report log
2024/10/16 02:25 18m retest repro upstream report log
2024/10/01 21:35 23m retest repro upstream report log
▶ ▼ Cause bisection attempts (2)
Created Duration User Patch Repo Result
2023/07/27 13:44 9h29m bisect upstream OK (1) job log log
2023/07/18 01:58 4h51m bisect upstream error job log
marked invalid by nogikh@google.com

Sample crash report:
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc5-syzkaller-00299-g11066801dd4b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x3d/0x1f0 lib/dump_stack.c:120
 panic+0x71d/0x800 kernel/panic.c:354
 check_hung_uninterruptible_tasks kernel/hung_task.c:227 [inline]
 watchdog+0xd87/0x1240 kernel/hung_task.c:379
 kthread+0x2c4/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (26):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/03 03:59 upstream 11066801dd4b f00eed24 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/10/27 13:30 upstream 850925a8133c 65e8686b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/05/28 07:05 upstream 2bfcfd584ff5 f550015e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/04/02 14:21 upstream fe46a7dd189e 6baf5069 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/26 13:34 upstream fe46a7dd189e bcd9b39f .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/22 19:30 upstream fe46a7dd189e 7a239ce7 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/29 19:40 upstream 41bccc98fb79 991a98f4 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/29 10:38 upstream 4854cf9c61d0 cc4a4020 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/27 07:49 upstream 168174d78157 cc4a4020 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/18 23:21 upstream 296455ade1fd 239abf84 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/17 10:38 upstream 052d534373b7 2a7bcc7f .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/01/07 22:09 upstream 52b1853b080a d0304e9c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/11/15 02:56 upstream 9bacdd8996c7 cb976f63 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/10/28 12:21 upstream 888cf78c29e2 3c418d72 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/10/14 20:57 upstream 727fb8376504 6388bc36 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/09/26 09:55 upstream 6465e260f487 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/04/21 04:34 upstream 977b1ef51866 af24b050 .config strace log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/19 06:54 upstream fe46a7dd189e baa80228 .config strace log report syz [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/17 23:22 upstream fe46a7dd189e d615901c .config console log report syz [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/04/01 19:26 upstream fe46a7dd189e 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/09 23:19 upstream 09e5c48fea17 6ee49f2e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/11/30 23:53 upstream 3b47bc037bd4 f819d6f7 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2023/07/17 20:39 upstream fdf0eaf11452 e5f10889 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/10/30 02:58 upstream e42b1a9a2557 66aeb999 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/10/29 23:21 upstream e42b1a9a2557 66aeb999 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
2024/03/27 07:36 upstream fe46a7dd189e 454571b6 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-badwrites-root kernel panic: hung_task: blocked tasks
* Struck through repros no longer work on HEAD.