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[Qemu-devel] Qemu-KVM 0.12.3 and Multipath -> Assertion

From: Peter Lieven
Subject: [Qemu-devel] Qemu-KVM 0.12.3 and Multipath -> Assertion
Date: Mon, 03 May 2010 23:26:44 +0200
User-agent: Thunderbird (Macintosh/20100228)

Hi Qemu/KVM Devel Team,

i'm using qemu-kvm 0.12.3 with latest Kernel
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.


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