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From Luca Toscano <toscano.l...@gmail.com>
Subject Re: [users@httpd] Crashes in CentOS 7
Date Thu, 20 Jul 2017 16:47:56 GMT
Hi Bruno,

2017-07-20 16:33 GMT+02:00 Bruno Dorchain <bruno.dorchain@gmail.com>:

> We got the following crash when under load:
> *** Error in `/usr/sbin/httpd': double free or corruption (!prev):
> 0x00007f19a010cf80 ***
> ======= Backtrace: =========
> /lib64/libc.so.6(+0x7c503)[0x7f19ce15c503]
> /lib64/libapr-1.so.0(apr_pool_destroy+0x1a7)[0x7f19ce8da2d7]
> /lib64/libapr-1.so.0(apr_pool_destroy+0x55)[0x7f19ce8da185]
> /etc/httpd/modules/mod_ssl.so(+0x164d0)[0x7f19c89844d0]
> /etc/httpd/modules/mod_ssl.so(+0x1307a)[0x7f19c898107a]
> /usr/sbin/httpd(ap_process_request_after_handler+0x5d)[0x7f19cfc3766d]
> /usr/sbin/httpd(ap_process_request+0x14)[0x7f19cfc382e4]
> /usr/sbin/httpd(+0x52c32)[0x7f19cfc34c32]
> /usr/sbin/httpd(ap_run_process_connection+0x40)[0x7f19cfc2cc90]
> /etc/httpd/modules/mod_mpm_event.so(+0x6bf5)[0x7f19cc9f1bf5]
> /lib64/libpthread.so.0(+0x7dc5)[0x7f19ce6acdc5]
> /lib64/libc.so.6(clone+0x6d)[0x7f19ce1d776d]
>
> May be linked to "ModSecurity: collection_retrieve_ex: Failed deleting
> collection (name ..." appearing on a regular basis.
>
> Any hint to troubleshoot that?
>


I would start from https://httpd.apache.org/dev/debugging.html#crashes and
see if you can get more detail from the stack-traces. Are you running a
recent version of httpd / mod-security (which is not maintained by the
httpd dev community, it is a third party product) ?

It would be also great if you could find how to reproduce this issue (maybe
checking the requests logged around the time of the crashes, etc..).

Hope that helps!

Luca

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