Re: [mp2] segfaulting apache in ap_pcw_walk_files_config

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Flavio Curti wrote:
> Hello
> 
> I have a problem running mod_perl-2.0.0 (and the latest devel snapshot too):
> 
> Apache segfaults on startup as soon as I have the LoadModule directive
> in the httpd.conf. This also happens when running make test. I have
> compiled mod_perl with debugging enabled and found the problematic
> spot, however I have no idea on what exactly is wrong:
> 
> (gdb output after segfault):
> 
> [Mon May 23 17:10:32 2005] [info] 6 Apache2:: modules loaded
> [Mon May 23 17:10:32 2005] [info] 0 APR:: modules loaded
> [Mon May 23 17:10:32 2005] [info] base server + 27 vhosts ready to run tests
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread -1212529568 (LWP 11107)]
> 0xb75a86dc in ap_pcw_walk_files_config (pconf=0x80c20a8, s=0x80c8018, 
>     dconf=0x80fe4a8, modp=0xb75bb500, 
>     dir_cb=0xb75a82d0 <modperl_hash_handlers_dir>, data=0x0)
>     at modperl_pcw.c:67
> 67	    ap_conf_vector_t **dirs = (ap_conf_vector_t **)dconf->sec_file->elts;
> (gdb) bt
> #0  0xb75a86dc in ap_pcw_walk_files_config (pconf=0x80c20a8, s=0x80c8018, 
>     dconf=0x80fe4a8, modp=0xb75bb500, 
>     dir_cb=0xb75a82d0 <modperl_hash_handlers_dir>, data=0x0)
>     at modperl_pcw.c:67
> #1  0xb75a889e in ap_pcw_walk_config (pconf=0x80c20a8, s=0x80c8018, 
>     modp=0xb75bb500, data=0x0, dir_cb=0xb75a82d0 <modperl_hash_handlers_dir>, 
>     srv_cb=0xb75a8390 <modperl_hash_handlers_srv>) at modperl_pcw.c:121
> #2  0xb75a851a in modperl_mgv_hash_handlers (p=0x0, s=0x0) at modperl_mgv.c:520
> #3  0xb759ac52 in modperl_hook_post_config_last (pconf=0x80c20a8, 
>     plog=0x80f8180, ptemp=0x80fa188, s=0x80c8018) at mod_perl.c:701
> #4  0x080824ca in ap_run_post_config ()
> #5  0x08087d7e in main ()
> (gdb) 

Thanks for the complete report, Flavio. We had this problem reported 
before and Philippe was working on it as you can see from this thread
http://www.gossamer-threads.com/lists/modperl/dev/7190#7190
which is a great example how things suck when people don't trim their 
followups to the list :(

gozer, mind to take a look at this one, as you've been already working on 
this? Thanks!

> In order to isolate the problem further I changed line 118 of modperl_pcw.c from
>   if (dir_cb) {
> to 
>   if (dir_cb && 0) {
> 
> and mod-perl2 started working! So there seems to be a problem with
> reading configuration files/directories somehow.



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