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Re: [Qemu-discuss] qemu-img convert stuck

From: David Lee
Subject: Re: [Qemu-discuss] qemu-img convert stuck
Date: Wed, 18 Apr 2018 15:42:52 +0800

On Thu, Apr 12, 2018 at 11:57 PM, David Lee <address@hidden> wrote:
>>> We tested qemu-kvm-ev-2.9.0-16.el7_4.14.1 - where from the source RPM we
>>> verified it does contain ef6dada8b44e1e7c4bec5c1115903af9af415b50
>>> But the issue still exists.  The convert got stuck if one of the old
>>> active overlay
>>> had been 'vol-resize'd  with qemu monitor command to a larger size.  This 
>>> looks
>>> like a prerequisite but not sufficient condition to trigger this badness.
>> So it is a separate issue. Did you try upstream master as well?
>> Fam
> Not yet.

Stefan & FAM,

Here are the steps to reproduce this issue reliably:

# qemu-img create -f qcow2 test.qcow2 100m
... omitted
# qemu-img create -F qcow2 -f qcow2 -b test.qcow2 overlay.qcow2
... omitted
# qemu-img resize overlay.qcow2 +20m
Image resized.
# qemu-img create -F qcow2 -f qcow2 -b overlay.qcow2 overlay2.qcow2
... omitted
# qemu-img convert overlay2.qcow2 -f qcow2 -O qcow2 combined.qcow2

# qemu-img --version
qemu-img version 2.9.0(qemu-kvm-ev-2.9.0-16.el7_4.14.1)

Li Qun

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