Ubuntu
pcs package

Ruby processes get stuck on sched_yield busyloop

Bug #1783161 reported by Casey & Gina on 2018-07-23

This bug report is a duplicate of: Bug #1834072: 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.. Edit Remove

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	pcs (Ubuntu)	New	Undecided	Unassigned

Using the pcs package results in runaway ruby/pcsd processes that use 100% CPU (reported but ignored here: https://bugs.launchpad.net/ubuntu/+source/pcs/+bug/1772998). Strace shows them stuck in a sched_yield() loop. After more digging this seems to a problem in the ruby interpreter, and was fixed in a patch discussed here: https://bugs.launchpad.net/ubuntu/+source/pcs/+bug/1772998

However it's still a problem in Ubuntu 16.04.

Can this fix please be backported to Ubuntu 16?

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