Bug 1013005 - openstack-novnc-proxy creates zombies
openstack-novnc-proxy creates zombies
Product: Fedora
Classification: Fedora
Component: python-websockify (Show other bugs)
x86_64 Linux
unspecified Severity low
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Assigned To: Pádraig Brady
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-09-27 10:58 EDT by Pádraig Brady
Modified: 2016-07-19 16:03 EDT (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of: 998423
Last Closed: 2016-07-19 16:03:08 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Pádraig Brady 2013-09-27 10:58:35 EDT
+++ This bug was initially created as a clone of Bug #998423 +++

Description of problem:
After displaying novnc console, there are zombie processes left on the host with openstack-nova-novncproxy service.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. nova boot foo ...
2. curl `nova get-vnc-console foo novnc | awk '/ novnc / { print $4 }'` > /dev/null
3. ps aux | grep defunct

Actual results:
nova     29199  0.0  0.0      0     0 ?        Z    09:44   0:00 [python] <defunct>
root     29225  0.0  0.0 103232   888 pts/0    S+   09:44   0:00 grep defunct

Expected results:
root     29225  0.0  0.0 103232   888 pts/0    S+   09:44   0:00 grep defunct

Additional info:
When displaying the console in Horizon, way more of zombies gets created.
`service openstack-nova-novncproxy restart` works as an effective zombie killer weapon.

--- Additional comment from Solly Ross on 2013-09-20 14:00:16 EDT ---

Issue appears to be with noVNC.  Specifically, noVNC uses the python multiprocessing library.  However, it would appear that it only sets up the signal handler for SIGCHLD (to reap the zombie processes) when using the native OS.fork implementation (which is only used as a fallback implementation).  Simply activating the SIGCHLD handler with the same function used for fork seems to solve the problem.  However, this is in upstream websockify code, so I'm submitting a patch upstream.

--- Additional comment from Solly Ross on 2013-09-20 14:16:24 EDT ---

pull request submitted upstream: https://github.com/kanaka/websockify/pull/96
Comment 1 Jaroslav Reznik 2015-03-03 10:06:37 EST
This bug appears to have been reported against 'rawhide' during the Fedora 22 development cycle.
Changing version to '22'.

More information and reason for this action is here:
Comment 3 Fedora End Of Life 2016-07-19 16:03:08 EDT
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
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