Cannot mount vol after balance crash

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Added 2 drives to my RAID10, then ran btrfs balance. The system appears
to have crashed after several hours (I was ssh'd in at the time on my
local network). When I reboot the Arch system, I ran btrfs check and no
errors were reported.

However, attempting to mount the vol hangs the system. Trying to mount
the system in recovery mode also hangs the system.

    ─────  uname -a                                                                                                                             ~
Linux luna 4.8.13-1-ARCH #1 SMP PREEMPT Fri Dec 9 07:24:34 CET 2016 x86_64 GNU/Linux
    ─────     btrfs --version                                                                                                                   ~
btrfs-progs v4.9
    ─────     btrfs fi show                                                                                                                     ~
Label: 'Archlinux'  uuid: e5ee12ac-7fb3-4e73-b9b2-a5cfb35145ae
        Total devices 1 FS bytes used 66.41GiB
        devid    1 size 111.24GiB used 111.24GiB path /dev/sda2

Label: 'Share'  uuid: 9102bb33-49ad-4baf-a88d-1c7622bff938
        Total devices 6 FS bytes used 4.20TiB
        devid    1 size 2.73TiB used 1.90TiB path /dev/sdc
        devid    2 size 2.73TiB used 1.90TiB path /dev/sdd
        devid    3 size 2.73TiB used 1.90TiB path /dev/sde
        devid    4 size 2.73TiB used 1.90TiB path /dev/sdb
        devid    5 size 2.73TiB used 440.34GiB path /dev/sdf
        devid    6 size 2.73TiB used 440.34GiB path /dev/sdg

    ─────     btrfs fi df /home # Replace /home with the mount point of your btrfs-filesystem                                                   ~
Data, single: total=109.22GiB, used=64.92GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=2.02GiB, used=1.48GiB
GlobalReserve, single: total=179.64MiB, used=0.00B

The dmesg log when attempting to mount the vol can be found at url

http://cwillu.com:8080/108.63.177.210/1

Any ideas what can be done to be able to mount the volume and complete
the balancing?

NOTE: the wiki link for mailing list subscribe instructions links to
a page indicating web subscriptions are no longer handled with no
instructions how do subscribe manually -- presumably by sending
a subscribe email request. Would appreciate a reply or cc to this email
(and instructions how to subscribe to the mailing list).

Regards,
Steven

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