linux-kernel - Re: 4.7-rc6: NMI in intel

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Message-ID: <5630546.0MIYeGNSYG@vostro.rjw.lan>
Date:	Tue, 12 Jul 2016 14:40:23 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Meelis Roos <mroos@...ux.ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-pm@...r.kernel.org, Len Brown <lenb@...nel.org>
Subject: Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6

On Tuesday, July 12, 2016 03:27:19 PM Meelis Roos wrote:
> > On HP Proliant DL360 G6, Debian unstable 4.6 kernel runs fine but 
> > selfcompiled 4.7-rc6 and 4.7-rc7 sometimes crash with NMI from 
> > intel_idle. Sometimes it boots fine. With intel_idle disabled, it has 
> > booted successful so far in 2 tries, one with rc6 and one with rc7.
> 
> More testing shows it can NMI on acpi_idle too, not just intel_idle.
> 
> > Screenshot with some backtrace: 
> > http://kodu.ut.ee/~mroos/intel-idle-NMI.png
> 
> http://kodu.ut.ee/~mroos/acpi-idle-NMI.png

There were almost no changes in the ACPI idle driver between 4.6 and
4.7-rc, so the reason is somewhere else.

Have you tried any earlier 4.7-rc?

The only change between 4.6 and now in the ACPI processor stuff at all is
this one

86314751c794 ACPI / processor: Avoid reserving IO regions too early

so does it help if that's reverted?

Otherwise, any chances to bisect?

Thanks,
Rafael