[mapserver-users] Mapcache segmentation faults under high load

[Eichner, Andreas - SID]

Hi Pieter,

have you checked the ulimit for the user the Apache runs under? See man core(5) for possible reasons why no core is dumped.

HTH

> -----Ursprüngliche Nachricht-----
> Von: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org] Im
> Auftrag von Pieter Callewaert
> Gesendet: Montag, 6. März 2017 11:01
> An: mapserver-users at lists.osgeo.org
> Betreff: Re: [mapserver-users] Mapcache segmentation faults under high
> load
> 
> Hi Thomas,
> 
> 
> 
> The documentation for debug compiling is not complete
> (http://mapserver.org/mapcache/install.html
> <http://mapserver.org/mapcache/install.html> ).
> 
> If I add -DCMAKE_BUILD_TYPE="Debug" to the cmake, it this enough?
> 
> Also added CoreDumpDirectory /tmp/apache2-gdb-dump to apache2.conf, and
> now I see this in the error log:
> 
> 
> 
> [Thu Mar 02 08:46:42.588518 2017] [core:notice] [pid 13:tid
> 140052444931968] AH00051: child pid 14 exit signal Segmentation fault
> (11), possible coredump in /tmp/apache2-gdb-dump
> 
> [Thu Mar 02 08:46:55.606507 2017] [core:notice] [pid 13:tid
> 140052444931968] AH00051: child pid 2097 exit signal Segmentation fault
> (11), possible coredump in /tmp/apache2-gdb-dump
> 
> 
> 
> Unfortunately, no dumps yet, so I’m afraid I did something wrong with the
> debug compiling.
> 
> 
> 
> Kind regards,
> 
> Pieter C
> 
> 
> 
> From: thomas bonfort [mailto:thomas.bonfort at gmail.com]
> Sent: Wednesday, 1 March, 2017 09:33
> To: Pieter Callewaert <pieter.callewaert at be-mobile.com>; mapserver-
> users at lists.osgeo.org
> Subject: Re: [mapserver-users] Mapcache segmentation faults under high
> load
> 
> 
> 
> Try to get a backtrace from the crashes by compiling mapcache in debug
> mode, and configuring apache to allow coredumps. The "stale lock" messages
> you are seeing are side effects of the crashes so that's not where I'd
> investigate at first.
> 
> 
> 
> regards,
> 
> thomas
> 
> 
> 
>