* perf/x86/intel: Fix large period handling on Broadwell CPUs
@ 2018-06-21 20:50 Jim Mattson
2018-06-21 21:07 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Jim Mattson @ 2018-06-21 20:50 UTC (permalink / raw)
To: stable
I'd like to nominate commit f605cfca8c39 ("perf/x86/intel: Fix large
period handling on Broadwell CPUs") for backport to the affected
stable Linux releases. (The bug was introduced in 4.1.)
Because of this bug, the NMI watchdog timer may fire spuriously on
Broadwell systems, resulting in a hard lockup panic when there is, in
fact, no lockup.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: perf/x86/intel: Fix large period handling on Broadwell CPUs
2018-06-21 20:50 perf/x86/intel: Fix large period handling on Broadwell CPUs Jim Mattson
@ 2018-06-21 21:07 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2018-06-21 21:07 UTC (permalink / raw)
To: Jim Mattson; +Cc: stable
On Thu, Jun 21, 2018 at 01:50:56PM -0700, Jim Mattson wrote:
> I'd like to nominate commit f605cfca8c39 ("perf/x86/intel: Fix large
> period handling on Broadwell CPUs") for backport to the affected
> stable Linux releases. (The bug was introduced in 4.1.)
>
> Because of this bug, the NMI watchdog timer may fire spuriously on
> Broadwell systems, resulting in a hard lockup panic when there is, in
> fact, no lockup.
I just checked, and it looks like this is already included in the
following kernel releases:
4.9.104 4.14.45 4.16.13 4.17
and it does not apply to the 4.4.y tree at all.
If it needs to go into 4.4, can you please send a working backport?
thanks,
greg k-h
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2018-06-21 20:50 perf/x86/intel: Fix large period handling on Broadwell CPUs Jim Mattson
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