[Bug 1835660] Re: initramfs unpacking failed

[Gon Solo]

Has this to do with BLK_DEV_RAM being compiled as a module? From
init/initramfs.c:

>       if (IS_ENABLED(CONFIG_BLK_DEV_RAM))
>                printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
>        else
>                printk(KERN_INFO "Unpacking initramfs...\n");

>        err = unpack_to_rootfs((char *)initrd_start, initrd_end - initrd_start);
>        if (err) {
>#ifdef CONFIG_BLK_DEV_RAM
>                populate_initrd_image(err);
>#else
>                printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
>#endif

So the IS_ENABLED line is true while the ifdef CONFIG_BLK_DEV_RAM line
seems to evaluate to false.

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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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