Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully
On 11/16/2017 02:19 PM, Hans van Kranenburg wrote:
>
> Latest work on this:
>
> https://patchwork.kernel.org/patch/10035835/
>
> "Applied to for-linus-4.15."
Ok, I just built a 4.9.65 kernel with this patch on top and the config
from debian (config-4.9.0-4-amd64). It applies without complaints:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5e25f5db6abb96ca8ee2aaedcb863daa6dfcc07a
With the 4.9.51-1 from Stretch I can reliably reproduce the broken CPU
counters after doing live migration with Xen once or maybe twice.
The 4.9.65 + steal time patch survived throwing it around >20 times now,
and there's no sign of any weird behaviour any more.
Counters in /proc/stat keep showing values that still make sense,
instead of suddenly jumping to values like 1174983480817 or 1753913027832...
How do we proceed from here?
--
Hans van Kranenburg
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