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Groups > linux.debian.kernel > #59526

Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully

From Hans van Kranenburg <hans.van.kranenburg@mendix.com>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully
Date 2017-12-01 17:40 +0100
Message-ID <uRWw1-6H5-5@gated-at.bofh.it> (permalink)
References (1 earlier) <uM653-2uW-3@gated-at.bofh.it> <ucGoO-4hg-23@gated-at.bofh.it> <uRWw1-6H5-7@gated-at.bofh.it> <ucGoO-4hg-23@gated-at.bofh.it> <uRWw1-6H5-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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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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Thread

Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Michael Lass <bevan@bi-co.net> - 2017-08-09 23:10 +0200
  Processed: Re: Bug#871608: linux-image-4.9.0-3-amd64: Linux  kernel should handle decreasing cpu steal clock counter gracefully owner@bugs.debian.org (Debian Bug Tracking System) - 2017-09-25 02:10 +0200
  Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Ben Hutchings <ben@decadent.org.uk> - 2017-09-25 02:10 +0200
    Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Michael Laß <bevan@bi-co.net> - 2017-09-25 09:40 +0200
    Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Michael Laß <bevan@bi-co.net> - 2017-10-13 00:40 +0200
  Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Hans van Kranenburg <hans.van.kranenburg@mendix.com> - 2017-11-15 14:40 +0100
  Bug#871608: linux-image-4.9.0-3-amd64: Linux kernel should handle decreasing cpu steal clock counter gracefully Hans van Kranenburg <hans.van.kranenburg@mendix.com> - 2017-12-01 17:40 +0100

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