From: Peter Lieven <pl@dlh.net>
Subject: Qemu-KVM 0.12.3 and Multipath -> Assertion
Date: Mon, 03 May 2010 23:26:44 +0200
Message-ID: <4BDF3F94.1080608@dlh.net>
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To: kvm@vger.kernel.org, qemu-devel@nongnu.org
Sender: kvm-owner@vger.kernel.org

Hi Qemu/KVM Devel Team,

i'm using qemu-kvm 0.12.3 with latest Kernel 2.6.33.3.
As backend we use open-iSCSI with dm-multipath.

Multipath is configured to queue i/o if no path is available.

If we create a failure on all paths, qemu starts to consume 100%
CPU due to i/o waits which is ok so far.

1 odd thing: The Monitor Interface is not responding any more ...

What es a really blocker is that KVM crashes with:
kvm: /usr/src/qemu-kvm-0.12.3/hw/ide/internal.h:507: bmdma_active_if: 
Assertion `bmdma->unit != (uint8_t)-1' failed.

after the multipath has reestablisched at least one path.

Any ideas? I remember this was working with earlier kernel/kvm/qemu 
versions.

Thanks,
Peter