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[Qemu-devel] external snapshots freezes block device since qemu 2.8

From: Piotr Rybicki
Subject: [Qemu-devel] external snapshots freezes block device since qemu 2.8
Date: Thu, 9 Mar 2017 11:11:09 +0100
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1

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

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