At a first glance this looks like all the hangs occur because the hypercall
used to poll for the pv interrupts never returns. Has there been any change to
then hypervisor on the affected instances? Or maybe some correlation with a
specific type of hw running those?
Can we get the full dmesg of one of the hanging guests after a reboot (which I
assume keeps it on the same host)? Did the instances just idle or where they
used for some task that you can tell us about? Thanks.
** Changed in: linux-ec2 (Ubuntu)
Importance: Undecided => High
** Changed in: linux-ec2 (Ubuntu)
Status: New => Incomplete
** Changed in: linux-ec2 (Ubuntu)
Assignee: (unassigned) => Stefan Bader (stefan-bader-canonical)
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https://bugs.launchpad.net/bugs/929941
Title:
Kernel deadlock in scheduler on m2.2xlarge EC2 instance
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