[collectd] Strange issue with exec and unixsock plugin

[XANi]

Dnia 2010-08-23, pon o godzinie 13:42 +0200, Sebastian Harl pisze:

> Hi,
> 
> 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

-- 
Mariusz Gronczewski (XANi) <xani666 at gmail.com>
GnuPG: 0xEA8ACE64
http://devrandom.pl
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