2010/10/2 Igor Galić <i.ga...@brainsware.org> > > ----- "Thomas Lindgren" <thomas.lindg...@diino.net> wrote: > > > Hi all, > > > > We just upgraded to Debian Lenny and saw some unexpected behaviour > > from an Apache node running a mod_perl2 app which I hope someone here > > can explain. > > > > After running the system for a short while, the server stops accepting > > requests. Checking the system, we can see that all workers have > > disappeared but the apache2 parent process remains alive. There's no > > relevant information in the access or error logs. After some > > experimentation, we have also found that if we restart the server with > > MaxRequestsPerChild set to zero, it seems to keep going. It thus looks > > like the workers stop after serving MaxRequestsPerChild, then are not > > restarted. > > > > So, any ideas about what's going on or how to troubleshoot this would > > be appreciated. > > Can you get a strace from the parent once, or shortly before it reaches > such a state? > > gdb would also be a plus... > > gcore $pid etc.. > > It could also be that some of Debian's patches are causing this.. > > you could try to compile (the latest versions of) httpd and mod_perl2 > and see if you can reproduce this behaviour. > > (See https://scm.brainsware.org/svn/webstack/linux/Makefile on how > to compile for Debian) > > But before going down that rourte ith might be worth elaborating > what your httpd does, other then serve a mod_perl2 application. > Since you do have a number of other modules loaded which could > be useful or suspects in this case. > > Hi Igor,
Thanks for the tips, we'll try to reproduce this first with strace/gdb active. Second, checking this with a clean compile might be a good idea too. The mod_perl2 app is mainly used for extended/hacked WebDAV-access and has been in production for a couple of years under Debian Etch (where we haven't seen this sort of behaviour before). By the way, the version with MaxRequestsPerChild = 0 stayed up over the weekend, so it seems to be a workaround of sorts. But we'd prefer to use the original config, so we'll do some more investigating even so. Best regards, Thomas -- Thomas Lindgren, Chief Technology Officer, Diino AB
