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From Sorin Manolache <sor...@gmail.com>
Subject Re: Module segfault on Ubuntu apache
Date Sat, 16 May 2009 23:25:41 GMT
On Sun, May 17, 2009 at 01:07, Fabio Zund <fabioz@eiffel.com> wrote:
>
> Joe Lewis wrote:
>>
>> Fabio Zund wrote:
>>>
>>> However, when I compile and test the module on the apache (also version
>>> 2.2.11) that comes with Ubuntu 9.04, all i get are segfaults.
>>>
>>> Does anyone know differences between the original apache and the Ubuntu
>>> apache version? What in my module could cause such errors?
>>
>> Unfortunately, I have never looked at the sources and patches used on
>> ubuntu.  I would suggest looking at the patches they include with their
>> source installation.  I think that would be a very good place to start.
>>  Additionally, debugging tools (e.g. gdb) might be a very good place to
>> start.  Your hints for the day :  run "gdb httpd" (or whatever binary is
>> used to start it, make sure you use the BINARY and not an init script), and
>> then at the gdb prompt, enter "run -X" - this starts the binary in a
>> single-instance mode.  Point the browser to it and generate the "errors".
>>  Then type "bt" to get a back trace.  Outside of that and looking at the
>> patches, I am unable to help.
>>
>> Joe
>>
>>
> The back trace in gdb showed that the segfault was caused by apr_pstrcat ()
> in /usr/lib/libapr-1.so.0.

Make sure the last argument of apr_pstrcat is NULL:

char *result = apr_pstrcat(pool, "Hello", " ", "dolly!", "\n", NULL);

Sorin


> At this point I had libapr and libapr-util
> version 1.1.12 installed (from the packager manager). So I installed
>  apr-1.3.3
> <http://mirror.cc.columbia.edu/pub/software/apache/apr/apr-1.3.3.tar.bz2>
> from the website. The same error occured. Then I installed apr-util-1.3.4
> <http://mirror.cc.columbia.edu/pub/software/apache/apr/apr-util-1.3.4.tar.bz2>
> as well, but after that I could not start apache anymore, it says:
> "/usr/sbin/apache2: symbol lookup error: /usr/sbin/apache2: undefined
> symbol: apr_ldap_ssl_init"
>
> I guess I'll just have to wait until the ubuntu guys add the new
> apr/apr-util versions to the packet manager repository and make it work....
>
> But thanks for the help!
>
> - Fabio Zund
>
>
>




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