Public bug reported:
Binary package hint: apcupsd
On Kubuntu Jaunty 9.04 connected to an APC SUA750I, I installed the
stock apcupsd 3.14.4-1 via apt-get. A couple configuration tweaks
(ISCONFIGURED=yes, USPCABLE usb, UPSTYPE usb, Device <blank>), and it
worked great - running apcaccess shows the status correctly.
However, after a reboot, or after an indeterminate amount of time
passes, running apcaccess results in a connection error, and ps shows
the apcupsd process dead as "apcupsd <defunct>". I've also seen variants
in which apcupsd is ok and apccontrol is <defunct>, or when both are
<defunct>. Once this state is reached, the only way out of it is to kill
-9 apcupsd, and start it again manually (sudo /etc/init.d/apcupsd
start), after which apcaccess once again works. Sometimes within a few
seconds, or the next consecutive call to apcaccess, it is already dead
again, and sometimes it can keep working for a long while before this
recurs. This may be caused by losing USB connectivity (I've seen some
indication in the logs), though of course the pc and ups remain on and
physically connected the whole time.
So the bug is twofold:
First, apcupsd should never die because of an error accessing the usb -
it should keep polling as usual until it's reconnected, and report the
appropriate status in any case, whether online or disconnected.
Second, it shouldn't be losing connectivity when everything remains
connected. This may or may not be a bug in apcupsd - maybe it's the usb
drivers or something else - I don't know. But it's a problem.
** Affects: apcupsd (Ubuntu)
Importance: Undecided
Status: New
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apcupsd <defunct> process death
https://bugs.launchpad.net/bugs/391000
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