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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: 144d, last: 8d12h
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 2078d 2078d 0/25 closed as invalid on 2018/04/01 11:45
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2023/11/29 03:49 16m retest repro upstream report log
2023/11/29 03:49 13m retest repro upstream report log
2023/11/11 13:21 17m retest repro upstream report log
2023/11/11 13:21 16m retest repro upstream report log
2023/10/10 10:20 16m retest repro upstream report log
2023/09/04 13:01 15m retest repro upstream report log
▶ ▼ Cause bisection attempts (2)
Created Duration User Patch Repo Result
2023/07/27 13:44 9h29m bisect upstream job log (1) log
2023/07/18 01:58 4h51m bisect upstream error job log (0)
marked invalid by nogikh@google.com

Sample crash report:
Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 panic+0x6dc/0x790 kernel/panic.c:344
 check_hung_uninterruptible_tasks kernel/hung_task.c:226 [inline]
 watchdog+0xd4f/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2023/11/15 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
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
* Struck through repros no longer work on HEAD.