[libvirt-users] external snapshots freezes block device since qemu 2.8

[Piotr Rybicki]

Hello there.

I discovered, that since qemu 2.8 , external snapshots (very similar to: 
http://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit), 
freezes block device after:

# virsh blockcommit (...)

There is no error message after completion of the command above.
I'm using gluster + ZFS fuse mount as a storage for a VM on gentoo.
libvirt debug showed nothing helpful.
With qemu <2.8 -: snapshots are working as expected.

Is this a known issue?
Is it qemu or libvirt ?

If it helps, how can i diagnose this further?

Thank You & Best regards
Piotr Rybicki