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Bug#813764: linux-source-3.16: "Dazed and confused, but trying to continue" on X10SDV-TLN4F while using perf top

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Control: reassign -1 src:linux 3.16.7-ckt20-1+deb8u3
Control: tag -1 unreproducible moreinfo

On Thu, 2016-02-04 at 23:25 -0500, Rich Ercolani wrote:
> Package: linux-source-3.16
> Version: 3.16.0-4
> Severity: normal
> 
> Dear Maintainer,
> 
> I was going about my business, using perf top to see what I was spending a
> bunch of my time in on this system, when suddenly, I got this written to
> console:
> 
> [2425302.546957] Uhhuh. NMI received for unknown reason 11 on CPU 1.
> [2425302.547625] Do you have a strange power saving mode enabled?
> [2425302.548291] Dazed and confused, but trying to continue
> 
> I've been running this system for several months at this point, and have not
> seen this issue at any point prior.
> 
> I can't easily reproduce it again, so it may have been something other than
> "perf top" that resulted in the behavior, but that's the only unusual thing
> I can think of.
[...]

perf uses the hardware performance monitoring units (PMUs) which do
trigger NMIs periodically.  Obviously the kernel should expect and
recognise these as related to performance monitoring, but there could
be a bug in that code.

I'm tagging this report as needing more information as we won't be able
to make any progress unless you can find a way to reproduce the bug.

Ben.

-- 
Ben Hutchings
It is a miracle that curiosity survives formal education. - Albert Einstein

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Bug#813764: linux-source-3.16: "Dazed and confused, but trying to continue" on X10SDV-TLN4F while using perf top Rich Ercolani <rercola@acm.jhu.edu> - 2016-02-05 05:30 +0100
  Bug#813764: linux-source-3.16: "Dazed and confused, but trying to continue" on X10SDV-TLN4F while using perf top Ben Hutchings <ben@decadent.org.uk> - 2016-02-05 14:40 +0100

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