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'bad tree block start' mount failure...

Booting linux 3.3, I found a particular set of steps [1] produces an
fs which is unmountable [2]. This also occurs when data is written
after mounting, so is entirely possible to hit in practice if RAID-0
is used.

Many thanks,

--- [1]

mkfs.btrfs -m raid0 -d raid0 /dev/sdb1 /dev/sdc1
mount /dev/sdb1 /mnt
umount /mnt
mount /dev/sdb1 /mnt -o compress
umount /mnt
mount /dev/sdb1 /mnt -o ssd
umount /mnt
mount /dev/sdb1 /mnt -o discard
umount /mnt
mount /dev/sdb1 /mnt
<mount failure>

--- [2]

[13259.593809] btrfs bad tree block start 0 37715968
[13259.593832] btrfs: failed to read tree root on sdc1
[13259.594221] btrfs: open_ctree failed
Daniel J Blueman
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