Summary...
For Ubuntu Bionic, dpkg triggers for systemd (237-3ubuntu10.39) might
have caused systemd to hang:
[ 363.776878] wait_for_completion+0xba/0x140
[ 363.776890] __flush_work+0x15b/0x210
[ 363.776901] flush_delayed_work+0x41/0x50
[ 363.776908] fsnotify_wait_marks_destroyed+0x15/0x20
[ 363.776912] fsnotify_destroy_group+0x48/0xd0
[ 363.776917] inotify_release+0x1e/0x50
[ 363.776923] __fput+0xea/0x220
[ 363.776929] ____fput+0xe/0x10
[ 363.776935] task_work_run+0x9d/0xc0
[ 363.776942] exit_to_usermode_loop+0xc0/0xd0
[ 363.776947] do_syscall_64+0x121/0x130
[ 363.776954] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
and
[ 364.050206] wait_for_completion+0xba/0x140
[ 364.050238] __synchronize_srcu.part.13+0x85/0xb0
[ 364.050248] synchronize_srcu+0x66/0xe0
[ 364.050256] fsnotify_mark_destroy_workfn+0x7b/0xe0
[ 364.050262] process_one_work+0x1de/0x420
[ 364.050267] worker_thread+0x228/0x410
[ 364.050272] kthread+0x121/0x140
and
[ 364.326985] wait_for_completion+0xba/0x140
[ 364.326988] __synchronize_srcu.part.13+0x85/0xb0
[ 364.326993] synchronize_srcu+0x66/0xe0
[ 364.326995] ? synchronize_srcu+0x66/0xe0
[ 364.326996] fsnotify_connector_destroy_workfn+0x4a/0x80
[ 364.326998] process_one_work+0x1de/0x420
[ 364.326999] worker_thread+0x253/0x410
[ 364.327001] kthread+0x121/0x140
All stack traces seem to come from "fsnotify" subsystem and waiting on
delayed work (completion) for fsnotify marks destruction after a
inotify_release() was called. Completion did not happen for the past 2
minutes. Without a kernel dump it is hard to tell if completion was
still ok - due to kthread being overloaded doing scheduled work and/or
the marks group destruction - or there was a dead lock for the
completion due to a kernel bug.
If this is reproducible, I think that having a kernel dump would help
identifying the issue. I'm letting the kernel team to handle this and
marking all other issues as dealt per previous comments.
** No longer affects: ipmitool (Ubuntu)
** Changed in: maas
Status: New => Invalid
** Summary changed:
- commissioning fails due to hung tasks setting up ipmitool
+ [Ubuntu][Bionic] systemd caused kernel to hang on fsnotify wait-on-completion
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux (Ubuntu)
** Project changed: linux => linux (Ubuntu)
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1872021
Title:
[Ubuntu][Bionic] systemd caused kernel to hang on fsnotify wait-on-
completion
To manage notifications about this bug go to:
https://bugs.launchpad.net/maas/+bug/1872021/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
