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Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2

From Salvatore Bonaccorso <carnil@debian.org>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2
Date 2026-10-05 07:50 +0200
Message-ID <NKJKh-3DOG-1@gated-at.bofh.it> (permalink)
References (7 earlier) <NKszL-3uls-5@gated-at.bofh.it> <NKBjH-3z8D-7@gated-at.bofh.it> <NKBjH-3z8D-5@gated-at.bofh.it> <NJ8MN-2Mjk-3@gated-at.bofh.it> <NKBjH-3z8D-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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Hi all,

On Sun, Oct 04, 2026 at 10:47:17PM +0200, Bernhard Schmidt wrote:
> On 04/10/26 02:16 PM, Bernhard Schmidt wrote:
> 
> Hi,
> 
> > What I don't get though, I followed Salvatore's instructions from a stock
> > Debian kernel which say
> > 
> >     cp /boot/config-$(uname -r) .config
> >     yes '' | make localmodconfig
> >     make savedefconfig
> >     mv defconfig arch/x86/configs/my_defconfig
> > 
> > so all settings should be the same. But as I wrote before, the kernel sizes
> > are wildly different, so possibly something went wrong here.
> > 
> > -rw-r--r--  1 root root   283542 Oct  3 15:02 config-6.12+unreleased-amd64
> > -rw-r--r--  1 root root   171116 Oct  2 01:00 config-6.12.107
> > -rw-r--r--  1 root root   283337 Aug 29 06:19 config-6.12.107+deb13-amd64
> > -rw-r--r--  1 root root   171310 Oct  2 01:05 config-6.12.111
> > -rw-r--r--  1 root root   283542 Sep 28 14:18 config-6.12.111+deb13-amd64
> > 
> > root@nm3:/boot# grep CONFIG_INTEL_IOMMU_DEFAULT_ON config-6.12*
> > config-6.12+unreleased-amd64:# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
> > config-6.12+unreleased-amd64:CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y
> > config-6.12.107:# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
> > config-6.12.107+deb13-amd64:# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
> > config-6.12.107+deb13-amd64:CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y
> > config-6.12.111:# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
> > config-6.12.111+deb13-amd64:# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
> > config-6.12.111+deb13-amd64:CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y
> > 
> > That setting is not set for both my kernels, the trixie kernels and the one
> > Salvatore sent out yesterday. So maybe it's enabled somewhere else in Debian
> > (a kernel patch)?
> > 
> > Anyway, I booted "my" .111 with intel_iommu=on now and it shows the "Adding
> > to iommu group" messages, so it should crash now.
> 
> Nope :-(
> 
> That kernel (built straight from the linux-stable tree) does not crash,
> even with IOMMU enabled. At least for the last 8 hours.
> 
> So although I copied over the config as instructed the 6.12.111-stable
> tree behaves differently, has a wildly different size of the .config and
> the binaries, and does not crash.

So this mgiht now be the same as in meanwhile reported upstream,
https://lore.kernel.org/stable/20261004122616.56714cbd@nargothrond/

Regards,
Salvatore

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Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Bernhard Schmidt <berni@debian.org> - 2026-10-04 00:10 +0200
  Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Ben Hutchings <ben@decadent.org.uk> - 2026-10-04 13:30 +0200
    Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Bernhard Schmidt <berni@debian.org> - 2026-10-04 22:50 +0200
      Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Salvatore Bonaccorso <carnil@debian.org> - 2026-10-05 07:50 +0200
        Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Bernhard Schmidt <berni@debian.org> - 2026-10-05 13:10 +0200
          Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Salvatore Bonaccorso <carnil@debian.org> - 2026-10-05 13:20 +0200
            Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Salvatore Bonaccorso <carnil@debian.org> - 2026-10-06 09:20 +0200

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