[Bug 1835660] Re: initramfs unpacking failed

[Dimitri John Ledkov]

So lz4 compressed initrd looks like this with hexdump

568f580 0523 00ac 54bf 4152 4c49 5245 2121 0021
568f590 0001 1cff 0050 0000 0000               
568f59a

I do wonder what ram is initialized too, and how those things look when
kernel reads initrd from memory as loaded by the bootloader / qemu.

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https://bugs.launchpad.net/bugs/1835660

Title:
  initramfs unpacking failed

Status in OEM Priority Project:
  New
Status in initramfs-tools package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  "initramfs unpacking failed: Decoding failed",  message appears on
  boot up.

  If I "update-initramfs" using gzip instead of lz, then boot up passes
  without decoding failed message.

  ---

  However, we currently believe that the decoding error reported in
  dmesg is actually harmless and has no impact on usability on the
  system.

  Switching from lz4 to gzip compression, simply papers over the
  warning, without any benefits, and slows down boot.

  Kernel should be fixed to correctly parse lz4 compressed initrds, or
  at least lower the warning, to not be user visible as an error.

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