Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP Proliant G6)

From	Joerg Roedel <joro@8bytes.org>
Newsgroups	linux.kernel
Subject	Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP Proliant G6)
Date	2016-07-13 11:10 +0200
Message-ID	<rUol3-VT-1@gated-at.bofh.it> (permalink)
References	(2 earlier) <rU58K-4Sa-23@gated-at.bofh.it> <rU6Rd-66R-73@gated-at.bofh.it> <rUmCC-8ei-55@gated-at.bofh.it> <rUnyG-oj-15@gated-at.bofh.it> <rUnIl-rS-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Jul 13, 2016 at 11:31:02AM +0300, Meelis Roos wrote:
> > > Bisecting kernel configs shows that it's DMAR+IOMMU. When it is 
> > > activated, there is high probability of NMI-s in random places.
> > 
> > Hmm, strange. But nothing could really surprise when you have an HP
> > BIOS.
> 
> BIOS P64 01/22/2015. There seems to be a newer 2015.08.16 BIOS out but 
> the release notes only describe updated CPU microcode for security 
> reasons.

It is probably something HP is selling as a "feature" and not a BIOS
bug.

> > Can you probably use the faulty config and bisect this down to a
> > specific commit? In v4.7-rc1 some changes to the iova-allocation code
> > got merged, but I have no idea how those could cause NMIs.
> 
> Will try but I do not know a working base yet - this was broken in both 
> 4.6 and 4.7-rc.

Oh, in that case it is not related to the recent iova changes. Does the
box have any hardware error log which you can access and send to us
(right after some NMIs happened)?


Thanks,

	Joerg

Thread

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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