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Bug#1127635: linux-image-6.18.9+deb14-powerpc64: fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI setup

Cross-posted to 3 groups.

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Uwe =?utf-8?Q?Kleine-K=C3=B6nig?= writes:
> You reported this issue about 6.18 while running 6.1.  Does that
> mean that 6.1 works fine?  If so, can you bisect over the packaged
> kernel packages to find out when the problem was introduced?  Also
> trying 6.19 (currently in experimental) would be a good test.

Heh.  linux-image-6.1.0-9-powerpc64 works without any issues, yes.  No
issues requiring modules be blacklisted.  And, while I am at it,
linux-image-6.18.15+deb14-powerpc64 works more or less as expected
with ehci_pci blacklisted, too.

The 6.1.0-9 kernel package (and the grub packages installed on this
machine) are from an 11.0.0 vintage ppc64 netinstall ISO.  I think
from
https://cdimage.debian.org/cdimage/ports/snapshots/2023-05-14/debian-11.0.0-ppc64-NETINST-1.iso
There were grub bugs that on the 12.x and 13.x installer ISOs that
prevented me getting the installation image to even start a kernel.
And I haven't yet tried the grub-ieee1275 2.14-2 packages.  But that
is an issue for different bug report.

Back to the topic at hand...  I'd be happy bisecting kernel packages
and reporting results.  But will need a little help locating the
archives for unreleased architectures.  Any pointers in that direction
would be great.

> Another thing that might be worth to try: There are two different
> flavours for powerpc kernel: the normal ones and the 64k pages ones.
> IIUC your machine should be able to work with both flavours.  It
> would be obscure but not totally unheard of, if this makes a
> difference.

I will give that a try and report results, too.  Probably sooner than
the kernel package bisecting process.

> Other than that it might be worth to forward upstream to the USB and
> powerpc maintainers.  But if you can do the bisection I suggest to
> wait with that and then include your findings in that report.

Sounds like a reasonable plan.

> > Unfortunately for our purposes here, this IBM beast is being
> > gifted to a friend sometime soon.  I think I have it until 10
> > March.  But am happy to try new kernel packages until such time as
> > it leaves my possession.
>
> If this happens before the bug details are worked out and said
> friend won't continue the investigation, we'll probably close this
> bug.

I understand.  Unreleased architecture, unreproducible...

I've started working with the -64k kernel package.  Expect some
updates soon.

Thanks!

- Aaron

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Bug#1127635: linux-image-6.18.9+deb14-powerpc64: fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI setup "Aaron D. Johnson" <debbugreporter@fnord.greeley.co.us> - 2026-02-10 20:50 +0100
  Bug#1127635: linux-image-6.18.9+deb14-powerpc64: fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI setup Uwe Kleine-König <ukleinek@debian.org> - 2026-02-22 12:40 +0100
  Processed: Re: Bug#1127635: linux-image-6.18.9+deb14-powerpc64:  fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI  setup "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-02-22 12:40 +0100
  Bug#1127635: linux-image-6.18.9+deb14-powerpc64: fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI setup Uwe Kleine-König <ukleinek@debian.org> - 2026-03-04 22:30 +0100
    Bug#1127635: linux-image-6.18.9+deb14-powerpc64: fails to boot on IBM 8204-E8A (POWER6 p550) LPAR, NULL deref in PCI MSI setup "Aaron D. Johnson" <adj@fnord.greeley.co.us> - 2026-03-05 01:00 +0100
  Processed: Re: [Patch] PCI/MSI: Handle lack of irqdomain gracefully "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-11 12:30 +0100

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