[Bug 1987567] Re: Xen Dom0 linux boot fails with multiple initrd files

Mauricio Faria de Oliveira 1987567 at bugs.launchpad.net
Wed Aug 24 22:07:52 UTC 2022 

Merge Request for Kinetic/devel series:
https://code.launchpad.net/~mfo/grub/+git/grub/+merge/428882

** Description changed:

+ [Impact]
+ 
+ The linux_xen template seems to be broken for multiple initrd files.
+ 
+ Linux fails to boot when it needs a real initrd but early/microcode
+ initrd(s) are found by grub-mkconfig.
+ 
+ The 2 patches (merged upstream [2]) allow more than one initrd to be
+ actually loaded, and the real/non-microcode initrd get used by Linux.
+ 
+ More details in the patchset cover letter [1].
+ 
+ [Test Plan]
+ 
+     $ sudo apt install microcode-initrd
+ 
+     $ du --bytes /boot/...
+     13660416 /boot/vmlinuz-5.4.0-122-generic
+     33062542 /boot/initrd.img-5.4.0-122-generic
+     5045248  /boot/microcode.cpio
+ - Original:
+ 
+     [    2.505207] Kernel panic - not syncing: VFS: Unable to mount root
+     fs on unknown-block(0,0)
+ 
+ - Patch 1:
+ 
+     [    1.890498] Freeing initrd memory: 4928K
+     ...
+     [    2.710948] Kernel panic - not syncing: VFS: Unable to mount root
+     fs on unknown-block(0,0)
+ 
+ - Patch 2:
+ 
+     [    1.968578] Freeing initrd memory: 32288K
+     ...
+     [    2.844889] Run /init as init process
+     [    2.916532] systemd-udevd[148]: Starting version 245.4-4ubuntu3.17
+ 
+ [Where problems could occur]
+ 
+ Regressions would be likely to manifest when booting Linux under Xen
+ with more than one initrd file (changes contained in this code path).
+ 
+ [Other Info]
+ 
+ [1] https://lists.gnu.org/archive/html/grub-devel/2022-08/msg00137.html
  [PATCH 0/2] templates/linux_xen: Properly handle multiple initrd files
- https://lists.gnu.org/archive/html/grub-devel/2022-08/msg00137.html
  
- ~/git/grub$ git log --oneline -2 origin/master -- util/grub.d/20_linux_xen.in
+ grub.git commits:
  18d8eafdea23 templates/linux_xen: Properly order the multiple initrd files
  b4b4acaf4ec7 templates/linux_xen: Properly load multiple initrd files

** Description changed:

  [Impact]
  
  The linux_xen template seems to be broken for multiple initrd files.
  
  Linux fails to boot when it needs a real initrd but early/microcode
  initrd(s) are found by grub-mkconfig.
  
  The 2 patches (merged upstream [2]) allow more than one initrd to be
  actually loaded, and the real/non-microcode initrd get used by Linux.
  
  More details in the patchset cover letter [1].
  
  [Test Plan]
  
-     $ sudo apt install microcode-initrd
+     $ sudo apt install microcode-initrd
  
-     $ du --bytes /boot/...
-     13660416 /boot/vmlinuz-5.4.0-122-generic
-     33062542 /boot/initrd.img-5.4.0-122-generic
-     5045248  /boot/microcode.cpio
+     $ du --bytes /boot/...
+     13660416 /boot/vmlinuz-5.4.0-122-generic
+     33062542 /boot/initrd.img-5.4.0-122-generic
+     5045248  /boot/microcode.cpio
+ 
  - Original:
  
-     [    2.505207] Kernel panic - not syncing: VFS: Unable to mount root
-     fs on unknown-block(0,0)
+     [    2.505207] Kernel panic - not syncing: VFS: Unable to mount root
+     fs on unknown-block(0,0)
  
  - Patch 1:
  
-     [    1.890498] Freeing initrd memory: 4928K
-     ...
-     [    2.710948] Kernel panic - not syncing: VFS: Unable to mount root
-     fs on unknown-block(0,0)
+     [    1.890498] Freeing initrd memory: 4928K
+     ...
+     [    2.710948] Kernel panic - not syncing: VFS: Unable to mount root
+     fs on unknown-block(0,0)
  
  - Patch 2:
  
-     [    1.968578] Freeing initrd memory: 32288K
-     ...
-     [    2.844889] Run /init as init process
-     [    2.916532] systemd-udevd[148]: Starting version 245.4-4ubuntu3.17
+     [    1.968578] Freeing initrd memory: 32288K
+     ...
+     [    2.844889] Run /init as init process
+     [    2.916532] systemd-udevd[148]: Starting version 245.4-4ubuntu3.17
  
  [Where problems could occur]
  
  Regressions would be likely to manifest when booting Linux under Xen
  with more than one initrd file (changes contained in this code path).
  
  [Other Info]
  
  [1] https://lists.gnu.org/archive/html/grub-devel/2022-08/msg00137.html
  [PATCH 0/2] templates/linux_xen: Properly handle multiple initrd files
  
  grub.git commits:
  18d8eafdea23 templates/linux_xen: Properly order the multiple initrd files
  b4b4acaf4ec7 templates/linux_xen: Properly load multiple initrd files

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https://bugs.launchpad.net/bugs/1987567

Title:
  Xen Dom0 linux boot fails with multiple initrd files

Status in grub2 package in Ubuntu:
  In Progress
Status in grub2 source package in Focal:
  Triaged
Status in grub2 source package in Jammy:
  Triaged
Status in grub2 source package in Kinetic:
  In Progress

Bug description:
  [Impact]

  The linux_xen template seems to be broken for multiple initrd files.

  Linux fails to boot when it needs a real initrd but early/microcode
  initrd(s) are found by grub-mkconfig.

  The 2 patches (merged upstream [2]) allow more than one initrd to be
  actually loaded, and the real/non-microcode initrd get used by Linux.

  More details in the patchset cover letter [1].

  [Test Plan]

      $ sudo apt install microcode-initrd

      $ du --bytes /boot/...
      13660416 /boot/vmlinuz-5.4.0-122-generic
      33062542 /boot/initrd.img-5.4.0-122-generic
      5045248  /boot/microcode.cpio

  - Original:

      [    2.505207] Kernel panic - not syncing: VFS: Unable to mount root
      fs on unknown-block(0,0)

  - Patch 1:

      [    1.890498] Freeing initrd memory: 4928K
      ...
      [    2.710948] Kernel panic - not syncing: VFS: Unable to mount root
      fs on unknown-block(0,0)

  - Patch 2:

      [    1.968578] Freeing initrd memory: 32288K
      ...
      [    2.844889] Run /init as init process
      [    2.916532] systemd-udevd[148]: Starting version 245.4-4ubuntu3.17

  [Where problems could occur]

  Regressions would be likely to manifest when booting Linux under Xen
  with more than one initrd file (changes contained in this code path).

  [Other Info]

  [1] https://lists.gnu.org/archive/html/grub-devel/2022-08/msg00137.html
  [PATCH 0/2] templates/linux_xen: Properly handle multiple initrd files

  grub.git commits:
  18d8eafdea23 templates/linux_xen: Properly order the multiple initrd files
  b4b4acaf4ec7 templates/linux_xen: Properly load multiple initrd files

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