Bug#493573: apache2: Restart and reload does not work

[Stefan Fritsch <sf@sfritsch.de>]

Hi,

On Thursday 07 August 2008, Vladislav Kurz wrote:
> we did some more testing and googling and foud thet this issue is
> discussed on apache-dev mailing list. They mention that the problem
> is related to proxy setting, and yes, we use mod_proxy too. There
> are some patches too.
>
> http://www.gossamer-threads.com/lists/apache/dev/355044?page=last

That thread is about a bug in the worker mpm in trunk. It says that 
2.2.x is not affected. Therefore this is probably not your problem.

> We did strace, the last line is:
>
> futex(0x4447a700, FUTEX_WAIT, 2, NULL
>
> if you want I can send the whole strace

When apache is not answering to requests, start top and type

fy
uwww-data

What info is in the WCHAN column? Get the pid of a process that has 
not "semtimedo" in the WCHAN column (if any) and strace that process 
and try to do a request.

It might also be interesting to see the strace output of a child 
process while you do a graceful restart.


Cheers,
Stefan