[collectd] Strange issue with exec and unixsock plugin

[Sebastian Harl]

On Mon, Aug 23, 2010 at 02:50:33PM +0200, XANi wrote:
> Dnia 2010-08-23, pon o godzinie 13:42 +0200, Sebastian Harl pisze:
> > On Mon, Aug 23, 2010 at 01:34:08PM +0200, XANi wrote:
> > > Dnia 2010-08-23, pon o godzinie 13:11 +0200, Sebastian Harl pisze:
> > > > On Mon, Aug 23, 2010 at 04:02:57AM +0200, XANi wrote:
> > > > > So after running something like:  
> > > > > while sleep 30 ; do /etc/init.d/collectd restart; done
> > > > > after some time (sometimes few minutes sometimes an hour or more) i get
> > > > > tons of collectd processes lying around (ive added output of ps aux as
> > > > > attachment) and sometimes after restart.
> > > > […]
> > > > > It seems to trigger when both exec and unixsock plugins are on, if i
> > > > > turn off one of them it works fine. Ah and im using 64 bit debian
> > > > > testing.
> > > > 
> > > > Uhm, strange. Could you please check (e.g. using "strace -p <pid>") what
> > > > those collectd processes are doing? What's the parent of those processes
> > > > (PPID in "ps ax -l" or use something like "ps axjf")? Are you able to
> > > > kill those processes using signal SIGINT or SIGTERM?
> > 
> > > Ok so:
> > > --
> > > # ps ax |grep col
> > > 4792 ?        SLsl   0:00 /usr/sbin/collectd
> > > -C /etc/collectd/collectd.conf -P /var/run/collectd.pid
> > > 4800 ?        S      0:00 /usr/sbin/collectd
> > > -C /etc/collectd/collectd.conf -P /var/run/collectd.pid
> > > --
> > > as attachment result of strace -t -ff -o /tmp/4792 -p 4792 and
> > > strace -t -ff -o /tmp/4800 -p 4800
> > > 
> > > parent of PID 4800 is 4792
> > > 4792 reacts on sigterm, 4800 both SIGTERM and SIGQUIT doesn't work, only
> > > SIGKILL
> > 
> > > 4800.4800:
> > > 13:25:33 futex(0x7fe9098f7550, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
> > 
> > Thanks. Looks like some kind of deadlock :-/ I'll look into that.
> 
> If u want i can give u access to VM with that bug already "trigerred"
> and root access so u can install debug tools, just send me ur ssh pubkey

Thanks. I'll have a look at the code first but I might come back to that
offer after that ;-) Not quite sure when I'll have some time for that
though. Possibly some time this week.

Cheers,
Sebastian

-- 
Sebastian "tokkee" Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/

Those who would give up Essential Liberty to purchase a little Temporary
Safety, deserve neither Liberty nor Safety.         -- Benjamin Franklin

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