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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