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virtio block device hangs after "virtio_blk virtio3: requests:id 0 is not a head!"
The virtual machine is running block layer workloads, interrupted by unclean reboots (echo b > /proc/sysrq-trigger). Kernel version is 3.14.
Sometimes, I get this message on boot:
"virtio_blk virtio3: requests:id 0 is not a head!"
Then, I/O to the virtio block devices just hangs.
Unfortunately I don't have a test case and this is kind of hard to reproduce, but it seems related to having I/O in flight when the kernel is forced to reboot.
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