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List:       apache-httpd-bugs
Subject:    [Bug 55449] AH01185: worker slotmem_create failed --> slotmem file name/ID not unique
From:       bugzilla () apache ! org
Date:       2013-08-22 21:01:47
Message-ID: bug-55449-7868-BMafgOCXbI () https ! issues ! apache ! org/bugzilla/
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https://issues.apache.org/bugzilla/show_bug.cgi?id=55449

--- Comment #2 from enteiser@googlemail.com ---
We experience semaphore collisions too when there a many apache instances on a
machine. Apache tries to create a semaphore which is already occupied by
another users apache instance.

If I interpret the code correctly the username prefix for the ID won't work
because the ID is passed to shmget, and key_t is an integer.

So various data is passed to a hash function to create a unique key_t. To me it
seems it's not so unique and collisions are more likely than intended?

Isn't it possible to use IPC_PRIVATE?

For quick lookup:

AH01179 happens here in line 797:
http://svn.apache.org/viewvc/httpd/httpd/tags/2.4.6/modules/proxy/mod_proxy_balancer.c?revision=1503324&view=markup


conf->id is some hashed value of some data created in line 766, and is
presumably passed as key_t to shmget at the end.

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