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

From: André Weidemann
Subject: [Qemu-devel] Re: Qemu-KVM 0.12.3 and Multipath -> Assertion
Date: Tue, 04 May 2010 07:38:09 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv: Gecko/20100317 Lightning/1.0b1 Thunderbird/3.0.4

Hi Peter,
On 03.05.2010 23:26, Peter Lieven wrote:

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

I have the same issue on my machine, although I am using local storage (LVM or a physical disk) to write my data to. I reported the "Assertion failed" on March 17th to the list. Marcello and Avi had asked some question back then, but I don't know if they have come up with a fix for it.


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