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<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Thomas,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The documentation for debug compiling is not complete (</span><a href="http://mapserver.org/mapcache/install.html"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">http://mapserver.org/mapcache/install.html</span></a><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">If I add
</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-DCMAKE_BUILD_TYPE="Debug" to the cmake, it this enough?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Also added CoreDumpDirectory /tmp/apache2-gdb-dump to apache2.conf, and now I see this in the error log:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">[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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Unfortunately, no dumps yet, so I’m afraid I did something wrong with the debug compiling.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Pieter C<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> thomas bonfort [mailto:thomas.bonfort@gmail.com]
<br>
<b>Sent:</b> Wednesday, 1 March, 2017 09:33<br>
<b>To:</b> Pieter Callewaert <pieter.callewaert@be-mobile.com>; mapserver-users@lists.osgeo.org<br>
<b>Subject:</b> Re: [mapserver-users] Mapcache segmentation faults under high load<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">regards,<o:p></o:p></p>
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<p class="MsoNormal">thomas<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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