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Server : Apache/2.4.18 (Ubuntu) System : Linux canvaswebdesign 3.13.0-71-generic #114-Ubuntu SMP Tue Dec 1 02:34:22 UTC 2015 x86_64 User : oppastar ( 1041) PHP Version : 7.0.33-0ubuntu0.16.04.15 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority, Directory : /usr/share/doc/apache2/ |
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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/core" to your apache configuration.
3) Execute as root:
mkdir -p /var/cache/apache2/core
chown www-data: /var/cache/apache2/core
/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/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/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