btrfs module dependencies broken in 3.14?

[Roman Mamedov <rm@romanrm.net>]

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Hello,

Not sure if this has been reported somewhere closer to Btrfs development, and
not just in Debian... Anyways, just now I (also) hit this bug when upgrading my
kernel from 3.12.21 to 3.14.5 on one machine (but not on a number of others):

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747929

I use btrfs as my root FS, and the error early in the initramfs stage, is
along the lines of:

> FATAL: Error inserting btrfs...: Unknown symbol in 
> module, or unknown parameter (see dmesg)

(noting in dmesg).

The workaround has been detailed back in 2010:
https://lists.debian.org/debian-user/2010/06/msg02060.html

After adding "crc32c" into /etc/initramfs-tools/modules (for forced inclusion
into the initramfs) and regenerating the initramfs image, the btrfs module
started loading fine.

Interesting why this problem from 2010 has resurfaced in 3.14, with 3.12
working normally. Also why not every machine with a similar setup is affected
(I have several hosts with btrfs root, although both hardware and software
configurations are not identical but quite diverse), but as I said just one
for me.

-- 
With respect,
Roman

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