FreeBSD 5.1-p10 reproducible crash with Apache2

["Branko F. Gračnar"]

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Hi.

FreeBSD 5.1-p10 (and also possible other 5.1-pX version) can be remotely
locked up if the following criteria is met:

+ apache2 has mod_ssl loaded and enabled
+ apache2 has the following configuration directives set to the
following values:

	SSLMutex sem
	SSLSessionCache shm:/some/file(1048576)

+ client connects via SSL/TLS to apache fast enough.

If all conditions above are satisfied except the last one, then lockup
doesn't happen.

I tested on three 5.1-p10 machines (SMP, uniprocessor, uniprocessor with
hypterthreading) with JMeter 1.9.1.

It is possible lockup machine with 100 requests (1 concurrent request)
in 1-3 seconds.

If SSLMutex is set to file:/path/somewhere and SSLSessionCache is set to
dbm:/some/dbm lockup does not accour.

Linux 2.4.22 is not affected by this issue.

Details:

apache: 2.0.47
php: 4.3.3 + turck mmcache 2.4.2
web application: horde imp webmail

Best regards, Brane
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