[CentOS] Apache won't start, semaphores exhausted

Fong Vang sudoyang at gmail.com
Thu Oct 20 23:10:44 UTC 2005

On 10/4/05, Aleksandar Milivojevic <alex at milivojevic.org> wrote:
> Fong Vang wrote:
> > (or why the system does not release the semaphore if Apache
> > is no longer running).
> Because IPC resources (semaphores, message queues and shared memory
> segments) are not tied to a process, an process simply has access to
> them (and can request for resource to be created or destroyed).  It is
> perfectly OK for a process to create any IPC resource, exit, and then
> some other process started at a later time to pick it up.  If something
> is allocating IPC resources and not cleaning up behind itself, than it
> is a bug in application (where application != process).  IPCs are
> outside of that nice box called process, so you should think outside of
> the box too.

Excellent.  Is there a way to tell which process is creating these
semaphores?  ipcs only lists the user/owner.

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