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How to troubleshoot "child pid n exit signal Segmentation fault (11)"

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http://unix.stackexchange.com – Since I upgraded from Ubuntu server 11.10 to 12.04, the following errors appear in the Apache logs: [Thu May 17 10:24:10 2012] [notice] child pid 8057 exit signal Segmentation fault (11) And the related process is: www-data 8057 8049 0 10:22 ? 00:00:00 /usr/sbin/apache2 -k start I have no clue how to start debugging this issue. The error is logged every 10 to 30 seconds, even after a fresh restart of Apache. How can I troubleshoot an issue like this? (HowTos)