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I have been able to reproduce this bug, by doing a block-commit on the active layer (as written up in the description).  This also does not occur upstream.

Looking in GDB, we are in aio_poll & bdrv_drain_all, but I have not pinpointed a particular patch as a fix.

This should not result in any data loss, as the job should run to completion, and even if stopped early the chain should still be intact.  However, it is a bad user experience, as it is not known how long it will be until QEMU is responsive again (and it could potentially be a long time, if there is a lot of data to commit).

This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions

according to comment0.
verified this bug with qemu-kvm-rhev-2.6.0-24.

qemu-kvm active during block-mirror.

so, This bug is fixed.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2673.html