Date: Mon, 15 Sep 2008 19:27:38 -0700 From: Alfred Perlstein <alfred@freebsd.org> To: Ivan Voras <ivoras@freebsd.org> Cc: stable@freebsd.org, freebsd-threads@freebsd.org Subject: Re: Apache-worker stuck at 100% CPU Message-ID: <20080916022738.GJ36572@elvis.mu.org> In-Reply-To: <9bbcef730809151604i28533745m286e7314810d0362@mail.gmail.com> References: <gadgrb$4uc$1@ger.gmane.org> <20080912165808.GE16977@elvis.mu.org> <9bbcef730809121444u34991c52m2cbc01a8ada47eb5@mail.gmail.com> <20080912225251.GG16977@elvis.mu.org> <9bbcef730809151604i28533745m286e7314810d0362@mail.gmail.com>
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* Ivan Voras <ivoras@freebsd.org> [080915 16:05] wrote: > 2008/9/13 Alfred Perlstein <alfred@freebsd.org>: > > >> Yes, it's multithreaded apache. This did help somewhat - when I show threads in top > >> I see that it's not actually stuck in umtxn - there's one thread that > >> consumes the CPU and it's apparently always running (in state CPUx). > >> > >> PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND > >> 7212 www 103 0 30340K 7932K CPU2 2 444:23 99.02% httpd > >> > >> I'm currently upgrading the system to 7-STABLE, to see if it helps. > > It didn't help. Exactly the same symptom happened again. It looks like > it happens a few days after the last system reboot. After it happens > the first time, restarting Apache immediately produces one such > "stuck" thread - it looks like some system state gets corrupted over > time. > > >> How do I pick what thread to backtrace in gdb? > > > > i think the command is 'info threads' or 'show > > threads' then i think you just type > > 'thread FOO' to select the thread. > > Both commands don't work / don't exist. Any others? > > (background: apache22-worker port, no mod_php, on 7.0 and 7-STABLE > suddenly gets stuck at 100% CPU; the same setup worked on 6-STABLE. > I'm looking for ideas) I'm sorry, I really can't help at this point other than to look through the documents myself to figure out how to do a backtrace/select threads. Give it a shot, and let us know and we can go further. Apologies, -Alfred
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