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Date: 8 Jul 2003 02:29:36 -0000
Message-ID: <20030708022936.26344.qmail@nagoya.betaversion.org>
From: bugzilla@apache.org
To: bugs@httpd.apache.org
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Subject: DO NOT REPLY [Bug 21322]  -
    main worker process locks up and no longer accepts requests

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=21322

main worker process locks up and no longer accepts requests


------- Additional Comments From glenn@apache.org  2003-07-08 02:29 -------
I am pretty sure that is from the main apache process which runs as root,
but the backtrace is for the main process.  I just did a gcore of a an
apache 2 main process on a server running normally and the backtrace for
the main process and its three threads look identical to the gcore generated
for the root process when apache 2 was not accepting requests.

After comparing the two I realized that my diagnosis of the problem I originally
posted is flawed.  Thanks for pointing out my bad assumptions. :-)

Here is what I am seeing.

A child process fails with a coredump.  From that time on apache 2 is still
bound to port 80 but does not respond to HTTP requests.  Our system monitoring
software does not detect that Apache 2 has failed. Usually a stop/start
of apache 2 will solve the problem.  This doesn't happen everytime a child
process dies.  There are no error messages other than that the child process
died.  LogLevel is set to WARN.

Can a hung child cause this behaviour?

The next time this happens I will make sure gcore is used
to generate a core file for all the apache processes.

Thanks, glenn

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