Comment 2 for bug 1028470

As i have written, this is a clean ubuntu install, i did not change any config files upon mentioned.
/etc/security/limits.conf ist standard config file with no limits inside (only comments).

I can't figure out how to determine the pid of apache child process that curl connects to. If you have an idea, please let me know.

Here is some output, that i get with gdb for a hanging apache:

main apache process (determined with pstree -p):
#0 0x00007f9b07745803 in select () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1 0x00007f9b07c630fd in apr_sleep () from /usr/lib/libapr-1.so.0
No symbol table info available.
#2 0x00007f9b0853bc69 in ap_wait_or_timeout ()
No symbol table info available.
#3 0x00007f9b08548e79 in ap_mpm_run ()
No symbol table info available.
#4 0x00007f9b0851e4a4 in main ()
No symbol table info available.

some child process
(gdb) bt full
#0 0x00007f9b0774e5b7 in semop () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1 0x00007f9b07c4f68e in ?? () from /usr/lib/libapr-1.so.0
No symbol table info available.
#2 0x00007f9b07c504a6 in apr_proc_mutex_lock () from /usr/lib/libapr-1.so.0
No symbol table info available.
#3 0x00007f9b085480dd in ?? ()
No symbol table info available.
#4 0x00007f9b0854893a in ?? ()
No symbol table info available.
#5 0x00007f9b085489f7 in ?? ()
No symbol table info available.
#6 0x00007f9b08549374 in ap_mpm_run ()
No symbol table info available.
#7 0x00007f9b0851e4a4 in main ()
No symbol table info available.

This is basically the same as for the working instance before the crash. The output changes, if i disable mod_ssl.
Any ideas?