[mapserver-users] Mapcache segmentation faults under high load

[thomas bonfort]

this doesn't seem to be a segfault, but the server that received a kill
signal... could you be getting out of memory errors ?

--
thomas

On Tue, Mar 7, 2017 at 8:18 AM Pieter Callewaert <
pieter.callewaert at be-mobile.com> wrote:

> Thanks Andreas, you brought me on a lead, indeed the ulimit for core size
> was on 0. Also it seems ubuntu running apport does not generate coredumps,
> had to change the core pattern.
>
> I've a core dump now, checked with GDB, but not sure what I'm searching
> at...
> http://pastebin.com/fAXdEg15
>
> Kind regards,
> Pieter C
>
> -----Original Message-----
> From: Eichner, Andreas - SID [mailto:Andreas.Eichner at sid.sachsen.de]
> Sent: Monday, 6 March, 2017 15:40
> To: Pieter Callewaert <pieter.callewaert at be-mobile.com>;
> mapserver-users at lists.osgeo.org
> Subject: AW: [mapserver-users] Mapcache segmentation faults under high load
>
> 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
> >
> >
> >
> >
>
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