[Qemu-devel] [Bug 583296] Re: I/O errors with qemu-nbd/qcow2

[Paolo Bonzini]

qemu-nbd has been rewritten since 0.12.3.  Closing.

** Changed in: qemu
       Status: New => Fix Released

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Title:
  I/O errors with qemu-nbd/qcow2

Status in QEMU:
  Fix Released

Bug description:
  I tried to open a qcow2 file with qemu-nbd and backup the files in it.
  After some coping I get lot of I/O errors in dmesg and the system
  hangs. One time I got even a kernel panic (Of course on a productive
  Server ;-) )

  How to reproduce:
  1. Connect nbd to a qcow2 file, a virtual machine mustn't use this file:
  qemu-nbd --connect=/dev/nbd0 /mnt/qcow/andromeda.qcow2 
  2. Read some data from /dev/nbd0p1
  dd if=/dev/nbd0p1 of=/dev/null bs=1M

  After a few Seconds till Minutes somethings crash's

  Attached some dmesg logs

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