Comment 226 for bug 1470250

First of all thanks for your effort guys (sorry, I cannot really help you out, I am a Java Developer and not into Ubuntu Kernel)!

I do experience these problems with a Hyper-V environment I operate for a volunteer fire departement.

I am not sure about the following fact, but testing around made it reasonable. My VMs (Ubuntu 14.04) were more likely to get into read-only state if the backup takes very long. When I backup only a few VMs, I usually have the problem very infrequently. If I backup more (or all) VMs, the problem occurs nearly at every backup.

Not sure if this helps indicating the problem, but maybe makes it easier to reproduce the bug, maybe by increasing the size of the disks (or even the used space).