btrfs: failed to read chunk root

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Hello,

trying out btrfs on my linux installation. I am running Funtoo with
Linux 3.0 kernel. After a reboot kernel panicked (no access to error
log since it is my root volume that failed). I get this using a rescue
cd (2.6.38, btrfs v 0.19) and then trying to mount :

[  752.129118] btrfs bad tree block start 0 131072
[  752.129152] btrfs: failed to read chunk root on sda5
[  752.132190] btrfs: open_ctree failed
[ 1132.984600] device label deux devid 1 transid 86 /dev/sdb3
[ 1171.796682] device fsid 9d42de57e2bebde7-4824b05acb3c538d devid 1
transid 346 /dev/sda5

Trying btrfsck:
btrfsck: disk-io.c:721: open_ctree_fd: Assertion `!(!chunk_root->node)' failed.

It had worked alright during the last couple of reboots. Before
rebooting I created a new btrfs volume which I am able to mount
without problems in rescue mode.

Thanks for any help,
Espen
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