Date: Fri, 12 Sep 2008 09:58:09 -0700 From: Alfred Perlstein <alfred@freebsd.org> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-threads@freebsd.org Subject: Re: Apache-worker stuck at 100% CPU Message-ID: <20080912165808.GE16977@elvis.mu.org> In-Reply-To: <gadgrb$4uc$1@ger.gmane.org> References: <gadgrb$4uc$1@ger.gmane.org>
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* Ivan Voras <ivoras@freebsd.org> [080912 04:09] wrote: > Hi, > > I'm running apache2.2.9-worker without mod_php (with mod_fcgid and PHP > as FastCGI) and a process or a thread repeatedly gets stuck: > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND > 5503 www 41 96 0 50820K 30960K umtxn 0 722:42 99.32% httpd > > It doesn't use sys time and ktrace doesn't record anything. > > Any clues where to dig next? > > I'm not using any unusual modules for apache, and the same configuration > worked in 6.3 (this system was upgraded from 6.3 to 7.0-R - I checked > that all apache dependancies are compiled for 7.0). Try using "pstack" a few times. It's in ports. Also, gcore(1) might help. You can also try to attach using gdb. Basically, one of these tools should give you a stack trace which can help. It's interesting that the process is in "umtxn" though, is it multithreaded apache? Can you dump the threads? I think top(1) has an option to view each thread, how about trying that? thank you, -Alfred
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