I also suspect something going sideways in the PV spinlock code, but
nothing has changed in the underlying hardware or hypervisor in this
area. There have been bugs in the PV spinlock code in the past,
including using mb() instead of barrier() in the unlock path, which
could cause the VCPU holding
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 o
Overnight an instance running 2.6.32-316 locked up. The stack traces are
attached.
** Attachment added: "stack traces from instance running 2.6.32-316"
https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2730182/+files/i-804475e2.txt
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Title:
Kernel deadlock in scheduler on m2.2xlarge EC2 instance
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** Attachment added: "stack traces from instance running 2.6.32-342 (1/1)"
https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2728703/+files/ubuntu-deadlock-2.6.32-342-1.txt
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** Attachment added: "stack traces from instance running 2.6.32-341 (2/2)"
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Kernel deadlock in scheduler on m2.2xlarge EC2 instance
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** Attachment added: "stack traces from instance running 2.6.32-341 (1/2)"
https://bugs.launchpad.net/ubuntu/+source/linux-ec2/+bug/929941/+attachment/2728701/+files/ubuntu-deadlock-2.6.32-341-1.txt
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