Assertion `!(exist->nmirrors >= 2)' failed

[Karl-Philipp Richter <krichter722@aol.de>]

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Hi together,
I wondered whether

    $ sudo btrfs rescue chunk-recover -y /dev/loop2p1
    btrfs: chunk-recover.c:124: process_extent_buffer: Assertion
`!(exist->nmirrors >= 2)' failed.
    $ echo $?
    134

is an error in btrfs or an error message of (the correctly working)
btrfs. Any ideas what this could mean? I'm having this trouble with a
system which is so messed up that I even can't restore

    $ sudo btrfs restore /dev/loop2p1 /mnt/data_extension/restore
    parent transid verify failed on 1068982272 wanted 47618 found 47575
    parent transid verify failed on 1068982272 wanted 47618 found 47575
    parent transid verify failed on 1068982272 wanted 47618 found 47575
    parent transid verify failed on 1068982272 wanted 47618 found 47575
    Ignoring transid failure
    leaf parent key incorrect 1068982272
    Couldn't setup extent tree
    parent transid verify failed on 1068982272 wanted 47618 found 47575
    Ignoring transid failure
    leaf parent key incorrect 1068982272
    Couldn't read fs root: -1

I'm issueing the command because it seems to be the last thing I can do
to rescue any data of that partition.

This occurs with v3.12 (output of `btrfs --version`) as well as the
latest commit 24cf4d8c3ee924b474f68514e0167cc2e602a48d of btrfs-progs.

Best regards,
Kalle Richter


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