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

[Kevin Wolf]

Am 03.05.2010 23:26, schrieb Peter Lieven:
> 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.

Can you get a stack backtrace with gdb?

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

If it works in the same setup with an older qemu version, bisecting
might help.

Kevin