I've made a little progress - compiled from the tmp branch of
btrfs-progs-unstable, and the unsupported feature error message goes
away.  However, now I segfault when running any command after three
parent transid failures.  Gdb gives me this:

Starting program: /home/xbmc/btrfs-progs-unstable/btrfs-debug-tree /dev=
/sda1
parent transid verify failed on 6038227976192 wanted 337418 found 33785=
3
parent transid verify failed on 6038227976192 wanted 337418 found 33785=
3
parent transid verify failed on 6038227976192 wanted 337418 found 33785=
3

Program received signal SIGSEGV, Segmentation fault.
find_first_block_group (root=3D0x61d1b0, path=3D0x61ef10, key=3D0x7ffff=
fffe240)
    at extent-tree.c:3028
3028                    if (slot >=3D btrfs_header_nritems(leaf)) {

Any possible way to recover from this?

On Fri, May 20, 2011 at 8:08 AM, Craig Johnson [off-list ref] wro=
te:

After upgrading from 2.6.39-rc7 to 2.6.39 this morning, I tried to
mount my 3 disk btrfs volume (no subvolumes, space caching enabled,
lzo compression) and received some parent transid errors (going back
to rc7 didn't help, though):

btrfs: disk space caching is enabled
parent transid verify failed on 6038227976192 wanted 337418 found 337=

853

parent transid verify failed on 6038227976192 wanted 337418 found 337=

853

parent transid verify failed on 6038227976192 wanted 337418 found 337=

853

parent transid verify failed on 6038227976192 wanted 337418 found 337=

853

parent transid verify failed on 6038227976192 wanted 337418 found 337=

853

Failed to read block groups: -5
btrfs: open_ctree failed

Tried to mount without space_cache give the same message.

Trying to run btrfsck (or btrfs-debug-tree), compiled from git gives =

me this:

couldn't open because of unsupported option features (8).
btrfsck: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
Aborted


I see an Ubuntu bug (748340 -
https://bugs.launchpad.net/ubuntu/+source/btrfs-tools/+bug/748340)
with a similar output (they get an unsupported option features (2)
instead of (8)), but there isn't any resolution that I see. =A0Is the=

re

anything I can do to resolve this? =A0I can't mount degraded or ro or
anything. =A0Thanks!

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