Got the same problem! No power failure. Just a normal reboot. And now I
am unable to mount my homefolder anymore :(

When issuing the command:
# mount -t btrfs /dev/sda5 /home

Get the following in dmesg:
[  534.320436] device fsid dddfdf4a-a846-4a61-a749-616389fd35bc devid 1 transid 
197638 /dev/sda5
[  534.326524] parent transid verify failed on 32522240 wanted 197242 found 
197636
[  534.326535] parent transid verify failed on 32522240 wanted 197242 found 
197636
[  534.326541] parent transid verify failed on 32522240 wanted 197242 found 
197636
[  534.326546] parent transid verify failed on 32522240 wanted 197242 found 
197636
[  534.327081] btrfs: open_ctree failed

When executing
# btrfsck /dev/sda5
got the following in terminal:

parent transid verify failed on 32522240 wanted 197242 found 197636
parent transid verify failed on 32522240 wanted 197242 found 197636
parent transid verify failed on 32522240 wanted 197242 found 197636
btrfsck: disk-io.c:412: find_and_setup_root: Assertion `!(!root->node)' failed.
Aborted

This is on ubuntu 11.10 on latest default kernel. Also upgraded from PPA to 
Linux kernel 3.2 with no luck :(
My harddisk is SSD.

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https://bugs.launchpad.net/bugs/793410

Title:
  btrfsck assert failure: btrfsck: disk-io.c:416: find_and_setup_root:
  Assertion `!(!root->node)' failed.

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