On Thu, 17 Apr 2008 12:13:04 +0200 Markus Meyer <markus.meyer@xxxxxxxx> wrote: > Hi all, > > we experience a lot of threads segfaulting with our Apaches. There > are about 300 dying threads per day. The error in syslog is the > following: > > Apr 16 23:51:41 foo-bar kernel: httpd[24629]: segfault at > 00007fffae529f98 rip 00002b2ffd6408b7 rsp 00007fffae529ea0 error 6 > > I wish I could give you some kind of trace or core file. But we don't > get a core file since only threads die and not the root-process. I Hmmm? Your subject line says prefork. With prefork, there are no threads. Anyway, no matter. You should get cores from a segfault. Have you enabled them? (See Coredumpdirectory, and check limitations imposed by your operating system and shell). > also tried to strace the Apache but this slowed the server down too > much. And the error appears only on the live system with a very high > load. Any ideas welcome here. We recently (for 2.2.9) fixed a bug that fits that description: http://issues.apache.org/bugzilla/show_bug.cgi?id=44402 But that's not relevant to prefork. > At the same time we get broken TCP packets with a wrong window size > which looks like this: Um, sounds like a problem in the network, below the level of apache. > The box is used for dynamic webpages on PHP. Below are some system > information. PHP is always a prime suspect for this kind of problem. If you're using mod_php, make sure you really are running prefork, as PHP+threads is a classic recipe for random segfaults. > Sorry, this is not very much information but I'm still at the > beginning of my Apache leraning curve. Contradictory information is more of a problem. -- Nick Kew Application Development with Apache - the Apache Modules Book http://www.apachetutor.org/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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