httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jens-U. Mozdzen" <jmozd...@nde.ag>
Subject Re: [users@httpd] help interpreting an Apache 2.2 segmentation fault backtrace. [I]
Date Thu, 06 Aug 2015 12:54:23 GMT
Hi Mark,

Zitat von Mark Blackman <mark.blackman@db.com>:
> Classification: For internal use only
>
> Hi guys,
>
> I wonder if you could me some clues about how to interpret the  
> following, frequently observed, backtrace from an Apache 2.2  
> segmentation fault (Apache 2.2.29, 32-bit, Linux, kernel  
> 2.6.32.59-0.7-default SLES11 SP2).
> [...]
> To me it looks like some kind of APR pool corruption or a corruption  
> of the pointer for the APR pool, and it looks like the mod_wl  
> handler is called first and then parts of the libct module are  
> getting called and finally segfaulting inside the APR routines.
>
> Anyone care to improve that interpretation?

it might be as simple as a heap corruption. Does apache22 use glibc  
malloc() routines? Then you might give setting MALLOC_CHECK_ to a  
non-zero value a try. OTOH, this may significantly reduce the  
performance of your httpd.

> [...]
> Program terminated with signal 11, Segmentation fault.
> #0  0xf7612ac1 in allocator_alloc ()
>    from /versions/apache-2.2.29/lib/libapr-1.so.0
> (gdb) bt
> #0  0xf7612ac1 in allocator_alloc ()
>    from /versions/apache-2.2.29/lib/libapr-1.so.0
> #1  0xf6f12f40 in apr_sdbm_rdonly ()
>    from /apache22/modules/libct_apache22_agent.so
> #2  0x00000010 in ?? ()
> #3  0xf7026ea8 in apr_sdbm_rdonly ()
>    from /apache22/modules/libct_apache22_agent.so
> #4  0x00000007 in ?? ()
> #5  0x0000001f in ?? ()
> #6  0xffceaa08 in ?? ()
> #7  0xf6e931a3 in ct_malloc () from /apache22/modules/libct_apache22_agent.so
> #8  0xf76134e1 in apr_pool_create_ex ()
>    from /versions/apache-2.2.29/lib/libapr-1.so.0
> #9  0x0b97af00 in ?? ()
> #10 0x00001fe8 in ?? ()
> #11 0xffceaa4c in ?? ()
> #12 0xf70f74d7 in operator new () from /usr/lib/libstdc++.so.6
> #13 0xf71410bb in _ZN6ReaderC9EP10apr_pool_tiP10LogContext ()
>    from /versions/wlsplugins_generic_11.1.1.7.0/lib/mod_wl.so
> [...]

Regards,
Jens


---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org


Mime
View raw message