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Date: Tue, 20 Dec 2011 08:04:31 +0000
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20111220080431.GA8664@stefanha-thinkpad.localdomain>
References: <20111209131037.2413.97284.malonedeb@gac.canonical.com>
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In-Reply-To: <20111219172622.31593.92992.malone@gac.canonical.com>
Subject: Re: [Qemu-devel] [Bug 902148] Re: qemu-img V1.0 hangs on creating
 Image (0.15.1 runs)
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To: Michael Niehren <902148@bugs.launchpad.net>
Cc: qemu-devel@nongnu.org

On Mon, Dec 19, 2011 at 05:26:22PM -0000, Michael Niehren wrote:
> i got the following output with your patch:
> 
> Formatting 'test.img', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536
> bdrv_rw_co_entry is_write 0 sector_num 0 nb_sectors 1 =waiting for rwco.ret != NOT_DONE
> waiting for rwco.ret != NOT_DONE
> 0
> bdrv_rw_co_entry is_write 1 sector_num 0 nb_sectors 1 =waiting for rwco.ret != NOT_DONE
> 0
> bdrv_rw_co_entry is_write 1 sector_num 128 nb_sectors 128 =waiting for rwco.ret != NOT_DONE
> 0
> bdrv_rw_co_entry is_write 1 sector_num 128 nb_sectors 128 =-5
> waiting for rwco.ret != NOT_DONE
> waiting for rwco.ret != NOT_DONE
> waiting for rwco.ret != NOT_DONE
> ....
> 
> and runs forever

The '=-5' is an Input/Output Error (EIO).  For some reason bdrv_rw_co()
is still waiting for the request to finish after the error has been
returned.

Is it possible for you to make the qemu-img binary available so I could
try to reproduce this and debug it?

Stefan