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From Micha Lenk <>
Subject Re: Reverse proxy, mod_security, segmentation fault
Date Thu, 12 Dec 2013 10:59:49 GMT
Hi Ewald,

Am 12.12.2013 10:16, schrieb Ewald Dieterich:
> [...] Is this a bug or am I doing something wrong?

I would consider the segmentation faults to be bugs. The question is
whether they are bugs in httpd or in mod_security...

Looking at the backtraces I noticed that most threads are busy in a
syscall (i.e. poll(), read() and the like) or waiting on a thread mutex
(i.e. pthread_cond_wait() etc.). Those threads are blocked and most
likely do not actively contribute to a segfault. In both segfaults you
can find a thread that is currently running a signal handler (i.e.
kill()). If I remember correctly, it is quite error prone to handle
signals in multi-threaded applications. I would assume your segfaults
are related to these typical signal handling issues with multithreading.

Hope that helps...


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