[Qemu-devel] [Bug 1359394] Re: virtio block device hangs after "virtio_blk virtio3: requests:id 0 is not a head!"

[Thomas Huth]

Triaging old bug tickets ... can you still reproduce this issue with the
latest version of QEMU and the kernel?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1359394

Title:
  virtio block device hangs after "virtio_blk virtio3: requests:id 0 is
  not a head!"

Status in QEMU:
  Incomplete

Bug description:
  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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