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References: <BC29A004BA570342A4CC0044A3845572CFCE4DB9@H3CMLB12-EX.srv.huawei-3com.com>
From: Thomas Huth <thuth@redhat.com>
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Date: Wed, 25 Oct 2017 09:22:04 +0200
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Subject: Re: [Qemu-devel] qemu-img crash when resize a qcow2 file created
 with preallocation=full/falloc .
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To: Changlimin <changlimin@h3c.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Cc: Qemu-block <qemu-block@nongnu.org>, Max Reitz <mreitz@redhat.com>

On 24.10.2017 05:28, Changlimin wrote:
> Hi,
> I am glad to see that qcow2 file created with preallocation=full/falloc can be resized. But when I test it, qemu-img crashs.
> qemu-img: block/qcow2-refcount.c:530: qcow2_refcount_area: Assertion `!(start_offset % s->cluster_size)' failed.
> 
> These are commands:
> qemu-img create -f qcow2 -o preallocation=full full.img 1G
> qemu-img resize --preallocation=full full.img +1G

Which version of qemu-img are you using? v2.10 or the latest git master
branch?

 Thomas