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Re: [Qemu-devel] qcow2, lazy_refcounts and killing qemu
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] qcow2, lazy_refcounts and killing qemu |
Date: |
Mon, 1 Sep 2014 15:19:28 +0100 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
A test case, attached.
Note that you have to look at the output of the final qemu-img info
command. In the case where it goes wrong, the 'backing file:' and
'backing file format:' lines disappear completely. In the case where
the bug is not reproduced, these lines are still present.
It's 100% reproducible for me when lazy_refcounts=on, and 0%
reproducible when lazy_refcounts=off.
BUT it only occurs if the backing file is a remote source (nbd:... in
this case), not if the backing file is a plain file. Make of that
what you will.
Rich.
--
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qemu-lazy-refcounts.sh
Description: Bourne shell script