[BUG] btrfs.fsck failing to fix corrupted block

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Hi there,
I am newbie and recently started using btrfs. Now facing a weird problem.

FWIW, I am on archlinux, kenel v3.8.0, having Btrfs v0.20-rc1.
After an abnormal reboot, getting these errors while boot:

systemd.fsck[289]: checking extents
systemd.fsck[289]: checking fs roots
systemd.fsck[289]: checking root refs
systemd.fsck[289]: found 23728128 bytes used err is 0
systemd.fsck[289]: total csum bytes: 23092
systemd.fsck[289]: total tree bytes: 81920
systemd.fsck[289]: total fs tree bytes: 24576
systemd.fsck[289]: btree space waste bytes: 38038
systemd.fsck[289]: file data blocks allocated: 23646208
systemd.fsck[289]: referenced 23646208
systemd.fsck[289]: Btrfs v0.20-rc1
[   OK   ]  Started File System Check on /dev/sda1.
               Mounting /boot...
systemd.fsck[289]: checking extents
[   OK   ] Mounted /boot.
[   OK   ] Reached target Sound Card.
systemd.fsck[289]: checking fs roots
systemd.fsck[289]: checking root refs
systemd.fsck[289]: extent buffer leak: start 206893056 len 4096
systemd.fsck[289]: *** Error in `fsck.btrfs`: corrupted double-linked
list: 0x0000000002081d80 ***

and its not proceeding and stuck here.
I have the rescue disk handy, but not sure how can I fix this issue.
Any help please.

thanks,

--
~shripadr
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