[squid-users] RE: Squid CPU 100% infinite loop

It appears that moving to 3.3.5-20130607-r12573 from 3.2.11-20130524-r11822 has eliminated my problem. I have seen a few unexplainable spikes in CPU usage, but they haven't lasted long and squid has remained responsive. I've been running 3.3.5-20130607-r12573 for just over two weeks without a problem. Mike Mitchell __________________________ From: Stuart Henderson [stu_at_spacehopper.org] Sent: Friday, June 21, 2013 9:57 AM To: squid-users_at_squid-cache.org Subject: Re: Squid CPU 100% infinite loop On 2013-05-28, Stuart Henderson <stu_at_spacehopper.org> wrote: > On 2013-05-17, Alex Rousskov <rousskov_at_measurement-factory.com> wrote: >> On 05/17/2013 01:28 PM, Loïc BLOT wrote: >> >>> I have found the problem. In fact it's the problem mentionned on my >>> last mail, is right. Squid FD limit was reached, but squid doesn't >>> mentionned every time the freeze appear that it's a FD limit >>> problem, then the debug was so difficult. >> >> Squid should warn when it runs out of FDs. If it does not, it is a >> bug. If you can reproduce this, please open a bug report in bugzilla >> and post relevant logs there. >> >> FWIW, I cannot confirm or deny whether reaching FD limit causes what >> you call an infinite loop -- there was not enough information in your >> emails to do that. However, if reaching FD limit causes high CPU >> usage, it is a [minor] bug. > > I've just hit this one, ktrace shows that it's in a tight loop doing > sched_yield(), I'll try and reproduce on a non-production system and open > a ticket if I get more details.. I haven't reproduced this in squid yet, but I recently hit a case with similar symptoms with another threaded program on OpenBSD which hit a loop on sched_yield if it received a signal while forking, this has now been fixed in the thread library. So if anyone knows how to reproduce, please try again after updating src/lib/librthread/rthread_fork.c to r1.8.
Received on Mon Jun 24 2013 - 14:48:27 MDT