https://bugzilla.wikimedia.org/show_bug.cgi?id=55709

Tim Starling <[email protected]> changed:

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--- Comment #5 from Tim Starling <[email protected]> ---
(In reply to comment #3)
> I quickly retracted that comment of mine on IRC last (European) night when I
> saw the code :)  I little more investigation happened at #wikimedia-tech --
> from what I can see on the SAL after I left, Tim found it was a missing
> cgroups
> issue on mw1035, mw1145, mw1078, mw1152, mw1150, which means the "texvc"
> invocation failed.

Actually, pretty much all of the apaches had the issue. Those 5 apaches didn't
even have the cgroup filesystem mounted, indicating that cgconfig hadn't been
started. On the rest of the apaches, cgconfig had been started but not
mw-cgroup.

When this bug occurred just now on mw1109, I ran "initctl log-priority debug"
then stopped and started cgconfig a couple of times. The logs showed the
started/stopped events going to cgred, but not to mw-cgroup. When I edited
mw-cgroup.conf with an irrelevant change, the syslog showed a configuration
reload due to inotify, and after that, mw-cgroup was started and stopped as
expected. So my suspicion is that at some point, something went wrong with
cgconfig or mw-cgroup or both, which, in combination with a bug in upstart,
caused mw-cgroup to stop receiving events.

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