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[Jürg Häfliger <2084664@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2084664

Title:
  Unable to boot J-hwe-6.8 kernel on openstack ppc64el VM

Status in ubuntu-kernel-tests:
  New
Status in linux-meta-hwe-6.8 package in Ubuntu:
  New

Bug description:
  This issue was found on Oct. 08 and affecting the s2024.09.02 and
  2024.09.30 cycle.

  The Jammy PowerPC VM on openstack refused to boot the J-hwe-6.8 kernel
  installed by running `sudo apt install kernel-testing--linux-hwe-6.8--
  full--generic`

  This issue can be found on both scalingstack_bos01 and
  scalingstack_bos02 region. For instances on scalingstack_bos02 you can
  see the system failed to find the root device and panics:

  [    0.288925] clk: Disabling unused clocks
  [    0.289052] md: Waiting for all devices to be available before autodetect
  [    0.289096] md: If you don't use raid, use raid=noautodetect
  [    0.289137] md: Autodetecting RAID arrays.
  [    0.289163] md: autorun ...
  [    0.289181] md: ... autorun DONE.
  [    0.289351] /dev/root: Can't open blockdev
  [    0.289383] VFS: Cannot open root device "UUID=b0bdf9d3-cb0f-4096-8d38-9071b53e0b8c" or unknown-block(0,0): error -6
  [    0.289449] Please append a correct "root=" boot option; here are the available partitions:
  [    0.289501] 0800        20971520 sda 
  [    0.289504]  driver: sd
  [    0.289547]   0801        20962287 sda1 0004e4f7-ac99-42ec-a415-0cc181049bb1
  [    0.289549] 
  [    0.289615]   0802            8192 sda2 8e56d7a3-2727-4f86-b2ba-8ed729683119
  [    0.289617] 
  [    0.289684] List of all bdev filesystems:
  [    0.289709]  ext3
  [    0.289710]  ext2
  [    0.289728]  ext4
  [    0.289745]  squashfs
  [    0.289763]  vfat
  [    0.289781]  fuseblk
  [    0.289798] 
  [    0.289833] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
  [    0.289884] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.8.0-45-generic #45~22.04.1-Ubuntu
  [    0.289935] Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1203 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries
  [    0.290001] Call Trace:
  [    0.290019] [c00000000738fb40] [c0000000016c20f8] dump_stack_lvl+0xe0/0x10c (unreliable)
  [    0.290075] [c00000000738fb70] [c0000000001933ec] panic+0x300/0x524
  [    0.290120] [c00000000738fc10] [c00000000300ce6c] mount_root_generic+0x208/0x444
  [    0.290173] [c00000000738fce0] [c00000000300d2c8] prepare_namespace+0x98/0x430
  [    0.290225] [c00000000738fd70] [c00000000300c220] kernel_init_freeable+0x32c/0x37c
  [    0.290278] [c00000000738fde0] [c00000000001145c] kernel_init+0x34/0x2a8
  [    0.290322] [c00000000738fe50] [c00000000000debc] ret_from_kernel_user_thread+0x14/0x1c
  [    0.290374] --- interrupt: 0 at 0x0
  [    0.292503] pstore: backend (nvram) writing error (-1)

  This can even be reproduced with an older kernel that used to work,
  just deploy and Jammy PowerPC vm on openstack and install the 6.8
  kernel from -updates pocket.

  From Stefan's investigation, ppc64el in openstack boots with 6.8 if we
  only install the virtual subset (linux-image-virtual-hwe-22.04)

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