** Changed in: ruby2.3 (Ubuntu)
Status: Triaged => In Progress
** Changed in: ruby2.3 (Ubuntu)
Assignee: (unassigned) => Andreas Hasenack (ahasenack)
** Description changed:
+ [Impact]
+
+ * An explanation of the effects of the bug on users and
+
+ * justification for backporting the fix to the stable release.
+
+ * In addition, it is helpful, but not required, to include an
+ explanation of how the upload fixes this bug.
+
+ [Test Case]
+
+ * detailed instructions how to reproduce the bug
+
+ * these should allow someone who is not familiar with the affected
+ package to reproduce the bug and verify that the updated package fixes
+ the problem.
+
+ [Regression Potential]
+
+ * discussion of how regressions are most likely to manifest as a result
+ of this change.
+
+ * It is assumed that any SRU candidate patch is well-tested before
+ upload and has a low overall risk of regression, but it's important
+ to make the effort to think about what ''could'' happen in the
+ event of a regression.
+
+ * This both shows the SRU team that the risks have been considered,
+ and provides guidance to testers in regression-testing the SRU.
+
+ [Other Info]
+
+ * Anything else you think is useful to include
+ * Anticipate questions from users, SRU, +1 maintenance, security teams and
the Technical Board
+ * and address these questions in advance
+
+ [Original Description]
+
Ubuntu 16.04
- ruby 2.3.1-2~16.04.12
+ 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:
+ 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
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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.
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