Public bug reported: Ubuntu 16.04 ruby 2.3.1-2~16.04.12 kernel 4.4.0-148-generic
We've noticed an issue across multiple servers where puppet agent will seem to get stuck and consume 100% CPU for days or weeks on end until manually killed. root@ps-prod-jenkins-qa-ui02:~# ps auxwwww|grep -i puppe[t] root 1412 0.0 0.2 143716 38680 ? Ssl Jun11 0:39 /usr/bin/ruby /usr/bin/puppet agent root 34884 74.4 0.3 286848 53724 ? Rs Jun23 1141:44 puppet agent: applying configuration root 111481 94.1 0.3 288572 54996 ? Rs Jun18 8642:32 puppet agent: applying configuration root 128479 54.8 0.3 286744 53596 ? Rs 10:30 250:17 puppet agent: applying configuration Strace shows it in a sched_yield() loop: root@ps-prod-jenkins-qa-ui02:~# strace -p 34884 -c strace: Process 34884 attached ^Cstrace: Process 34884 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 100.00 0.002130 0 123189 sched_yield ------ ----------- ----------- --------- --------- ---------------- 100.00 0.002130 123189 total Some googling shows this is a common issue which was supposedly fixed/backported to ruby 2.3: https://tickets.puppetlabs.com/browse/PA-1743 https://bugs.ruby-lang.org/issues/13794 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=876377 The following open Ubuntu bugs look to be having the same issue and suggest that this fix made it into Debian but never made it into Ubuntu: https://bugs.launchpad.net/ubuntu/+source/pcs/+bug/1783161 https://bugs.launchpad.net/ubuntu/+source/pcs/+bug/1772998 ** Affects: ruby2.3 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1834072 Title: Puppet agent using 100% CPU, in sched_yield() loop. Looks like an issue with ruby2.3 which has been fixed but not yet made it into Ubuntu. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ruby2.3/+bug/1834072/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
