This seems to be a bug that has regressed, I have encountered the same issue as 2 other reports:
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) running OpenStack. The workaround is to disable KSM:
echo 2 > /sys/kernel/mm/ksm/run
This fixes the issue temporarily.
This seems to be a bug that has regressed, I have encountered the same issue as 2 other reports:
LP: #1349897
Running kernel: 3.13.0-46-generic
This is replicated over many compute nodes (KVM) running OpenStack. The workaround is to disable KSM:
echo 2 > /sys/kernel/ mm/ksm/ run
This fixes the issue temporarily.