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

From	"Aaron D. Johnson" <debbugreporter@fnord.greeley.co.us>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	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
Date	2026-02-10 20:50 +0100
Message-ID	<Mn1Ue-hdU5-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: src:linux
Version: 6.18.9-1
Severity: important

Console output attached.

-- Package-specific info:
** Kernel log: boot messages should be attached

** Model information
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
revision	: 3.2 (pvr 003e 0302)
platform	: pSeries
model		: IBM,8204-E8A
machine		: CHRP IBM,8204-E8A
Device Tree model: IBM,8204-E8A

** Configuration for modprobe:
blacklist arkfb
blacklist aty128fb
blacklist atyfb
blacklist radeonfb
blacklist cirrusfb
blacklist cyber2000fb
blacklist kyrofb
blacklist matroxfb_base
blacklist mb862xxfb
blacklist neofb
blacklist pm2fb
blacklist pm3fb
blacklist s3fb
blacklist savagefb
blacklist sisfb
blacklist tdfxfb
blacklist tridentfb
blacklist vt8623fb
options snd_pcsp index=-2
options cx88_alsa index=-2
options snd_atiixp_modem index=-2
options snd_intel8x0m index=-2
options snd_via82xx_modem index=-2
options md_mod start_ro=1
options bonding max_bonds=0
options dummy numdummies=0
options ifb numifbs=0

** Network interface configuration:
*** /etc/network/interfaces:

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

*** /etc/network/interfaces.d/eth0:

allow-hotplug eth0

iface eth0 inet dhcp

iface eth0 inet6 auto

** PCI devices:
not available

** USB devices:
not available


-- System Information:
Debian Release: forky/sid
  APT prefers unreleased
  APT policy: (500, 'unreleased'), (500, 'unstable')
Architecture: ppc64

Kernel: Linux 6.1.0-9-powerpc64 (SMP w/8 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-image-6.18.9+deb14-powerpc64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.150
ii  kmod                                    34.2-2+b1
ii  linux-base                              4.15
ii  linux-base-6.18.9+deb14-powerpc64       6.18.9-1

Versions of packages linux-image-6.18.9+deb14-powerpc64 recommends:
pn  apparmor  <none>

Versions of packages linux-image-6.18.9+deb14-powerpc64 suggests:
pn  debian-kernel-handbook  <none>
pn  firmware-linux-free     <none>
hi  grub-ieee1275           2.06-12
pn  linux-doc-6.18          <none>
pn  mkvmlinuz               <none>

Versions of packages linux-image-6.18.9+deb14-powerpc64 is related to:
pn  firmware-amd-graphics      <none>
pn  firmware-atheros           <none>
pn  firmware-bnx2              <none>
pn  firmware-bnx2x             <none>
pn  firmware-brcm80211         <none>
pn  firmware-cavium            <none>
pn  firmware-cirrus            <none>
pn  firmware-intel-graphics    <none>
pn  firmware-intel-misc        <none>
pn  firmware-intel-sound       <none>
pn  firmware-ipw2x00           <none>
pn  firmware-ivtv              <none>
pn  firmware-iwlwifi           <none>
pn  firmware-libertas          <none>
pn  firmware-marvell-prestera  <none>
pn  firmware-mediatek          <none>
pn  firmware-misc-nonfree      <none>
pn  firmware-myricom           <none>
pn  firmware-netronome         <none>
pn  firmware-netxen            <none>
pn  firmware-nvidia-graphics   <none>
pn  firmware-qcom-soc          <none>
pn  firmware-qlogic            <none>
pn  firmware-realtek           <none>
pn  firmware-samsung           <none>
pn  firmware-siano             <none>
pn  firmware-ti-connectivity   <none>
pn  xen-hypervisor             <none>

-- no debconf information

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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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