I have seen this, on occasion, on systems that do not clear semaphore resources. I could suggest rebooting, which will force them, but thats not the nicest way. Did fokat's ipcs solution provide anything ? Usually the ipcs command shows any open shared memory ... if that shows all of the memory you have used, then you will need to clear them (using ipcrm)

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i had a memory leak once, and it ruined my favorite shirt.