[Bug 1970402] Re: Initrd out of memory error after upgrade to 22.04

[Sébastien Le Callonnec]

I had the same issue compiling a 5.15.36 kernel on Ubuntu 22.04,
initrd.img (.tmp) below was causing Out of memory:

-rw-r--r--  1 root root  13628696 May 23 22:58 initrd.img-5.15.36+
-rw-r--r--  1 root root 515731970 May 23 22:58 initrd.img-5.15.36+.tmp

Switching MODULES=most (which produced .tmp above) to MODULES=dep in
/etc/initramfs-tools/initramfs.conf produced the smaller initrd.img, and
fixed the issue.

$ cat /proc/meminfo
MemTotal:       16065036 kB
...

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Title:
  Initrd out of memory error after upgrade to 22.04

Status in initramfs-tools package in Ubuntu:
  Incomplete

Bug description:
  After upgrading to 22.04 system is unbootable because of "out of memory" error when loading initial ramdisk. I was able to fix it by editing cat /etc/initramfs-tools/initramfs.conf
  and changing configuration to:
  MODULES=dep
  COMPRESS=xz
  RUNSIZE=15%

  Not sure which one helped, but I can test it if needed.

  System information:
  Description:    Ubuntu 22.04 LTS
  Release:        22.04

  initramfs-tools:
    Installed: 0.140ubuntu13
    Candidate: 0.140ubuntu13
    Version table:
   *** 0.140ubuntu13 500
          500 http://pl.archive.ubuntu.com/ubuntu jammy/main amd64 Packages
          500 http://pl.archive.ubuntu.com/ubuntu jammy/main i386 Packages
          100 /var/lib/dpkg/status

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