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The following page has been changed by noodl:
http://wiki.apache.org/httpd/IPCExhaustion

The comment on the change is:
A start, at least

New page:
=No space left on device: Cannot create SSLMutex=

This error indicates that the server has run out of available slots for 
"inter-process communication". This can occur when a process crashes before 
cleaning up after itself.

The {{{ipcs}}} command will list semaphores and shared memory slots in use. If 
there is a large number of entries in use by the apache user use {{{ipcrm}}} to 
remove them.

Then, check your server's error log (possibly with {{{LogLevel debug}}} set) to 
figure out why it's crashing, or see: http://httpd.apache.org/dev/debugging.html

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