Bug 63801

Summary:	System Hangs With Kernel Migration Processes Consuming 100% CPU
Product:	Process Management	Reporter:	Andrew Piziali (andy)
Component:	Scheduler	Assignee:	Ingo Molnar (mingo)
Status:	NEW ---
Severity:	normal	CC:	alan, epopevad, limit.usus, szg00000
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.13-rc5	Subsystem:
Regression:	No	Bisected commit-id:

Description Andrew Piziali 2013-10-26 18:58:30 UTC

Once or twice a week, the system becomes non-responsive, with the mouse cursor tracking mouse movement but no keyboard response. Until today I would resort to using the kernel magic keys to reboot the system (R-E-I-S-U-B). Today I remotely logged in from another machine on the LAN and discovered that not only was the kernel alive and all processes running, but that the "migration/0" and "migration/1" processes were consuming 50% of the CPU each, as reported by top(1). I suspect this is why the system becomes non-responsive.

Reference Ubuntu bug 1223055 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1223055) for a log of diagnostics performed in an attempt to isolate this bug.

Comment 1 Alan 2013-11-13 11:56:27 UTC

Does the box have encrypted swap ?

Comment 2 Andrew Piziali 2013-11-13 14:05:37 UTC

No, it does not.