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[Qemu-devel] [Bug 1349972] Re: qcow2-refcount: qemu-io crashes on 'disca

From: Kevin Wolf
Subject: [Qemu-devel] [Bug 1349972] Re: qcow2-refcount: qemu-io crashes on 'discard' command
Date: Fri, 08 May 2015 11:13:15 -0000

I sent a patch that fixes the original problem that Maria reported. It's
hard to say whether this is the same problem as you saw, Sam, but it's
quite possible.

** Changed in: qemu
       Status: New => In Progress

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   qcow2-refcount: qemu-io crashes on 'discard' command

Status in QEMU:
  In Progress

Bug description:
  qemu-io is killed by SIGIOT at the 'discard' command on the image
  having no refcount information.

  1. Unpack test.img and backing_img.qed in the same directory (see the 
attached archives for images)
  2. Make a copy of test.img to copy.img (qemu-io modifies the image before 
being kill, therefore the image backup is necessary)
  3. Run the command

  qemu-io copy.img -c 'discard 2210816 2856448'

  Result: qemu-io is killed by SIGIOT with the reason:

  qemu-io: block/qcow2-refcount.c:468: update_refcount_discard:
  Assertion `d->bytes + length == new_end - new_start' failed.

  The image was generated by the image fuzzer.

  qemu.git HEAD: 1d80eb7a680d

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