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INFO: task hung in flush_old_commits

Status: upstream: reported C repro on 2023/05/23 03:33
Labels: reiserfs (incorrect?)
Reported-by: syzbot+0a684c061589dcc30e51@syzkaller.appspotmail.com
First crash: 187d, last: 13h39m

Cause bisection: introduced by (bisect log) :
commit d82dcd9e21b77d338dc4875f3d4111f0db314a7c
Author: Roberto Sassu <roberto.sassu@huawei.com>
Date: Fri Mar 31 12:32:18 2023 +0000

  reiserfs: Add security prefix to xattr name in reiserfs_security_write()

Crash: INFO: task hung in flush_old_commits (log)
Repro: C syz .config
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [reiserfs?] INFO: task hung in flush_old_commits 6 (8) 2023/05/30 15:44
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in flush_old_commits origin:upstream C 7 9d11h 57d 0/3 upstream: reported C repro on 2023/04/04 05:08
linux-5.15 INFO: task hung in flush_old_commits origin:upstream C 8 12d 71d 0/3 upstream: reported C repro on 2023/03/21 14:16

Sample crash report:
INFO: task kworker/0:0:7 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:22880 pid:7     ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x187b/0x4900 kernel/sched/core.c:6669
 schedule+0xc3/0x180 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_sync_fs fs/reiserfs/super.c:76 [inline]
 flush_old_commits+0x1e3/0x2f0 fs/reiserfs/super.c:111
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:1:26 blocked for more than 145 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D
 stack:25856 pid:26    ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x187b/0x4900 kernel/sched/core.c:6669
 schedule+0xc3/0x180 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_sync_fs fs/reiserfs/super.c:76 [inline]
 flush_old_commits+0x1e3/0x2f0 fs/reiserfs/super.c:111
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/0:2:900 blocked for more than 147 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2     state:D stack:27064 pid:900   ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x187b/0x4900 kernel/sched/core.c:6669
 schedule+0xc3/0x180 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_sync_fs fs/reiserfs/super.c:76 [inline]
 flush_old_commits+0x1e3/0x2f0 fs/reiserfs/super.c:111
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:2:2138 blocked for more than 148 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D
 stack:25080 pid:2138  ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x187b/0x4900 kernel/sched/core.c:6669
 schedule+0xc3/0x180 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_sync_fs fs/reiserfs/super.c:76 [inline]
 flush_old_commits+0x1e3/0x2f0 fs/reiserfs/super.c:111
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:0:5047 blocked for more than 151 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:28568 pid:5047  ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x187b/0x4900 kernel/sched/core.c:6669
 schedule+0xc3/0x180 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x7a/0xd0 fs/reiserfs/lock.c:27
 reiserfs_sync_fs fs/reiserfs/super.c:76 [inline]
 flush_old_commits+0x1e3/0x2f0 fs/reiserfs/super.c:111
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
INFO: task kworker/1:3:5049 blocked for more than 153 seconds.
      Not tainted 6.4.0-rc3-syzkaller-00004-g421ca22e3138 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3     state:D

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/05/23 08:12 upstream 421ca22e3138 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/05/19 03:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 3bb7af1d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/23 06:52 upstream 421ca22e3138 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/05/16 05:57 upstream f1fcbaa18b28 71b00cfb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/04/28 01:22 upstream 6e98b09da931 6f3d6fa7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/04/25 14:20 upstream 173ea743bf7a 65320f8e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/02/08 05:28 upstream 513c1a3d3f19 15c3d445 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/02/07 10:34 upstream 05ecb680708a 5bc3be51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/02/07 02:43 upstream d2d11f342b17 0a9c11b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/31 18:20 upstream 22b8077d0fce b68fb8d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/31 13:12 upstream 6d796c50f84c b68fb8d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/30 23:17 upstream 6d796c50f84c b68fb8d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/30 04:33 upstream ab072681eabe 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/28 09:03 upstream 83abd4d4c4be 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/27 09:00 upstream 7c46948a6e9c 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/24 00:40 upstream 7bf70dbb1882 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/23 21:39 upstream 7bf70dbb1882 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/12 03:37 upstream 7dd4b804e080 96166539 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/01/05 16:28 upstream 512dee0c00ad 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2022/12/03 10:29 upstream 97ee9d1c1696 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2022/11/26 01:35 upstream 08ad43d554ba f4470a7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2022/11/25 09:06 upstream c3eb11fbb826 74a66371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in flush_old_commits
2023/05/31 12:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci eb0f1697d729 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/31 03:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci eb0f1697d729 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/26 09:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 b40ef614 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/22 04:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/21 22:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/21 08:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/19 20:48 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/19 08:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
2023/05/18 22:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f1fcbaa18b28 3bb7af1d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in flush_old_commits
* Struck through repros no longer work on HEAD.