upstart gets stuck when start/restart service
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| upstart |
New
|
Undecided
|
Unassigned | ||
Bug Description
The problem can be reproduced by the following way:
1. Firstly the restarting services works fine; taking ssh for example
stack@
ssh start/running, process 25187
stack@
ssh start/running, process 25187
2. restart the upstart via the command of "telinit u"
3. we can see there are two /sbin/init processes keeping running;
stack@
Fri Oct 16 09:58:09 UTC 2015
stack@
root 1 0 0 Oct10 ? 00:00:03 /sbin/init
stack 19987 25058 0 09:58 pts/29 00:00:00 grep init
root 27756 1 0 09:41 ? 00:00:00 /sbin/init
4. upstart lost pid tracking for the existing service
stack@
ssh stop/waiting ---> no pid appended at here
5. then it will gets stuck when restart ssh.
stack@
System load info:
stack@DevStackO
Linux DevStackOSDomU 3.13.0-63-generic #103-Ubuntu SMP Fri Aug 14 21:42:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
stack@DevStackO
initctl (upstart 1.12.1)
Copyright (C) 2006-2014 Canonical Ltd., 2011 Scott James Remnant
| information type: | Proprietary → Public |
| affects: | ubuntu-website-content → upstart |
| description: | updated |
| description: | updated |
| Jianghua Wang (wjh-fresh) wrote | #1 |
| description: | updated |
Some more findings:
1. I think it's apparently that the hang is due to upstart lost tracking on the job's pid.
2. Before the hang occurred, there is a package upgrade. And due to there is libc upgrade (upstart depends on libc), it tries to restart the upstart via "telinit u". But don't know why the restart seems have problem to be finished; we can see there is an additional init process keeping running, where I think it should be a transient status. I guess the expected behavior is that the older init should be replaced by the new init after all things get migrated to the new init. but it seems it's not finished in time and is kept in an intermediate status.
$ ps -ef | grep init
root 1 0 0 Oct14 ? 00:00:05 /sbin/init
root 6647 1 0 Oct15 ? 00:00:00 /sbin/init
$ ps -ef | grep upstart
root 315 1 0 Oct14 ? 00:00:00 upstart-udev-bridge --daemon
root 526 1 0 Oct14 ? 00:00:00 upstart-
root 530 1 0 Oct14 ? 00:00:00 upstart-file-bridge --daemon
stack 2154 19493 0 02:57 pts/25 00:00:00 grep upstart
root 6781 1 0 Oct15 ? 00:00:00 upstart-udev-bridge --daemon
root 8188 1 0 Oct15 ? 00:00:00 upstart-file-bridge --daemon
root 8191 1 0 Oct15 ? 00:00:00 upstart-
Need some upstart experts help to dig further. Thanks.