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Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6

From Meelis Roos <mroos@linux.ee>
Newsgroups linux.kernel
Subject Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6
Date 2016-07-13 09:20 +0200
Message-ID <rUmCC-8ei-25@gated-at.bofh.it> (permalink)
References <rU4FH-4He-11@gated-at.bofh.it> <rU4Z8-4Ol-15@gated-at.bofh.it> <rU58K-4Sa-23@gated-at.bofh.it> <rU6Rd-66R-73@gated-at.bofh.it>
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> > > > 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?
> 
> I tried selfcompiled 4.6.0 now with the same conf that 4.7-rc's have and 
> after multiple tries I got the same NMI out of 4.6 too, from kernfs 
> lookup (that seems to just a random victim).
> 
> So this is not a 4.7 regression and probably not idle-releated.

Confirmed this is about IOMMU+DMAR, I'm continuing in another reply 
thread with other CC-s to not bother linux-pm people with it.

-- 
Meelis Roos (mroos@linux.ee)

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Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 Meelis Roos <mroos@linux.ee> - 2016-07-12 14:30 +0200
  Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-07-12 14:40 +0200
    Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 Meelis Roos <mroos@linux.ee> - 2016-07-13 09:20 +0200
    Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 10:20 +0200
      Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 10:30 +0200
        Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:10 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 11:20 +0200
            Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:50 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 11:40 +0200
            Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:50 +0200
              Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 12:20 +0200
                Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Alex Williamson <alex.williamson@redhat.com> - 2016-07-13 17:00 +0200
                Re: IOMMU+DMAR causing NMIs-s Meelis Roos <mroos@linux.ee> - 2016-07-14 00:00 +0200
                Re: IOMMU+DMAR causing NMIs-s Alex Williamson <alex.williamson@redhat.com> - 2016-07-14 01:10 +0200
                Re: IOMMU+DMAR causing NMIs-s Joerg Roedel <joro@8bytes.org> - 2016-07-14 10:40 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Henrique de Moraes Holschuh <hmh@hmh.eng.br> - 2016-07-13 16:00 +0200

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