Hi,
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
We did strace, the last line is:
futex(0x4447a700, FUTEX_WAIT, 2, NULL
if you want I can send the whole strace
--
Regards
Vladislav Kurz