khugepaged / firefox going wild in 3.18-rc

Norbert Preining
2014-11-04T23:20:30Z

Dear all,

(please Cc)

since 3.18-rc started, regularly, but unpredictably, firefox
(Debian iceweasel) goes completely boom to 100% CPU, and there
is also a kernel task khugepaged doing the same.

I need to kill firefox, or better the X session to get it back to normal.

THe logs don't show any strange output

top's top process:

27021 norbert 20 0 1351536 449868 88788 R 100.4 5.6 4:46.16 iceweasel
35 root 39 19 0 0 0 R 100.0 0.0 2:41.10 khugepaged

Switching back to 3.17 does Not* exhibit the same behaviour.

Is this a bug in Firefox/Iceweasel, or is there something luring in the
kernel.

All the best