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Date: Wed, 3 Aug 2011 16:07:06 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20110803130706.GA12262@redhat.com>
References: <4E36E5F7.6060202@cisco.com>
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Subject: Re: [Qemu-devel] qemu-kvm aborts - vhost_dev_unassign_memory:
 Assertion `to >= 0' failed.
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To: David Ahern <daahern@cisco.com>
Cc: aliguori@us.ibm.com, Avi Kivity <avi@redhat.com>, KVM mailing list <kvm@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org>

On Mon, Aug 01, 2011 at 11:44:23AM -0600, David Ahern wrote:
> qemu-kvm.git as of:
> 
> commit dacdc4b10bafbb21120e1c24a9665444768ef999
> Merge: 7b69d4f 0af4922
> Author: Avi Kivity <avi@redhat.com>
> Date:   Sun Jul 31 11:42:26 2011 +0300
> 
>     Merge branch 'upstream-merge' into next
> 
> is aborting with the error:
> 
> qemu-kvm: qemu-kvm.git/hw/vhost.c:123: vhost_dev_unassign_memory:
> Assertion `to >= 0' failed.
> Aborted
> 
> $ git bisect bad
> 00cb2a99f5e7f73c4fff54ae16c7b6acf463ab5c is the first bad commit
> commit 00cb2a99f5e7f73c4fff54ae16c7b6acf463ab5c
> Author: Avi Kivity <avi@redhat.com>
> Date:   Tue Jul 26 14:26:17 2011 +0300
> 
>     pc: convert pc_memory_init() to memory API
> 
>     Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
>     Signed-off-by: Avi Kivity <avi@redhat.com>
>     Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
> 
> :040000 040000 3d709c2cab75b934030fb9fbdfa99024c855b2a6
> 720d362f9702f15d16519093555182169d0b09bd M	hw
> 

Thanks for the report.
As Avi pointed out it's a vhost bug that got exposed
by a memory API change.
I have posted a patch which should fix that problem -
could you please try it and let me know?

Thanks!

-- 
MST