Comment 8 for bug 1359146

Right now 3.17-rc1 would show the virtio related issue only. With the current 3.16 we have there is still the writeback hung task issue mingled in (except with a kernel version of 3.16.0-10.15 or later), see bug #1357295.
Using Xen paravirt drives, there is no crash. This hints that it is something directly related to the combination of virtio disks and bcache. This looks to be an upstream problem still. So for this bug we should concentrate on either 3.17 or the latest Utopic kernel.