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

[André Weidemann]

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 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.


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.

Regards
 André