Ahh! did btrfs just explode on me?

[Chris Murphy]

On Wed, Jan 21, 2015 at 9:35 AM, Neal Becker <ndbecker2 at gmail.com> wrote:

> Jan 21 11:32:17 nbecker1 kernel: [   96.851478] WARNING: CPU: 0 PID: 1749 at
> fs/btrfs/delayed-inode.c:1410 btrfs_assert_delayed_root_empty+0x39/0x40 [btrfs]

Looks like this:
http://www.spinics.net/lists/linux-btrfs/msg40858.html
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.3

You should do three things: if the fs is still mounted, update your
backup; then install kernel 3.18.3 from updates-testing repo; then use
btrfs check --repair using btrfs-progs 3.18.

Since 3.17.8 didn't get this patch, and 3.17 is EOL, it won't ever get
it. Looks like the patch is in 3.18.3, and 3.14.29. And it's easier to
go with 3.18.3, which is in updates-testing.

Next you should reboot from Fedora 21 live media, and 'dnf upgrade
btrfs-progs' so that you have btrfs-progs 3.18.1, which is stable. And
use 'btrfs check --repair' in case there are any missing files, this
should find it. After this, you'd update the backup again in case the
first one lacks the missing files.


-- 
Chris Murphy