If apache crashes or freezes, it is helpful if you include a backtrace in the
bug report.



In case of a crash, do the following:

1) Install the packages apache2-dbg libapr1-dbg libaprutil1-dbg gdb.

2) Add "CoreDumpDirectory /var/cache/apache2" to your apache configuration.

3) Execute as root:
/etc/init.d/apache2 stop
ulimit -c unlimited
/etc/init.d/apache2 start

4) Do whatever it takes to reproduce the crash. There should now be the file
/var/cache/apache2/core .

5) If you use a forking MPM (e.g. mod_prefork), execute:

gdb /usr/sbin/apache2 /var/cache/apache2/core
(gdb) bt full
...
(gdb) quit

If you use a threaded mpm (mod_worker, mod_event), execute:

gdb /usr/sbin/apache2 /var/cache/apache2/core
(gdb) thread apply all bt full
...
(gdb) quit

Include the backtrace in the bug report.

6) Undo the change to your configuration, uninstall the debug packages, remove
/var/cache/apache2/core



In case of a hanging process, you don't need a core dump and you can skip steps 2 and 3.

4) Reproduce the problem. Get the pid of a hanging process.

5) Start gdb with

gdb -p pid

and continue as described above. It may also be helpful to include the output of

strace -p pid