Re: F24 QEMU running away at 100% cpu after system resume

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On 07/12/2017 05:03 PM, Samuel Sieb wrote:
> On 07/12/2017 04:48 PM, Cole Robinson wrote:
>> There's a bug about this issue with that's lingered in a lot of forms
>> for a while:
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=1380893
>>
>> But with my testing, kernel > 4.9 inside the VM fixes the issue. So
>> supported
>> fedora releases in the VM aren't affected anymore. You can work around
>> it by
>> disabling kvmclock for the VM, but I'm not sure what other side
>> effects that
>> will have
> 
> The other option would be to try upgrading the kernel in the VM to
> something 4.9 or higher.

I seem to recall an issue with kernels <4.9 and resume operations--VMs
or bare metal. IIRC there were two issues. One was in the i915 driver
and the second was something about a boffed internal state in one of the
timers that caused the slab code to run away or something like that.
I sure could be wrong about that. I rarely hibernate/resume my machines
so it never bit me.
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