Re: iotest 240 is failing

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Fri, May 16, 2025 at 09:21:32AM +0200, Thomas Huth wrote:
> On 24/04/2025 11.39, Thomas Huth wrote:
> > On 26/03/2025 11.43, Thomas Huth wrote:
> > > On 11/03/2025 17.00, Kevin Wolf wrote:
> > > > From: Stefan Hajnoczi <stefanha@redhat.com>
> > > > 
> > > > Allow virtio-scsi virtqueues to be assigned to different IOThreads. This
> > > > makes it possible to take advantage of host multi-queue block layer
> > > > scalability by assigning virtqueues that have affinity with vCPUs to
> > > > different IOThreads that have affinity with host CPUs. The same feature
> > > > was introduced for virtio-blk in the past:
> > > > https://developers.redhat.com/articles/2024/09/05/scaling-virtio-blk-
> > > > disk- io-iothread-virtqueue-mapping
> > > 
> > >   Hi Stefan!
> > > 
> > > This patch seems to cause some troubles with iotest 240 in raw (and
> > > some other) mode:
> > > 
> > > 240   fail       [11:41:33] [11:41:34]   0.8s   (last: 0.8s)  output
> > > mismatch (see tests/qemu-iotests/scratch/raw-file-240/240.out.bad)
> > > --- tests/qemu-iotests/240.out
> > > +++ tests/qemu-iotests/scratch/raw-file-240/240.out.bad
> > > @@ -46,11 +46,11 @@
> > >   {"execute": "device_add", "arguments": {"bus": "scsi0.0", "drive":
> > > "hd0", "driver": "scsi-hd", "id": "scsi-hd0"}}
> > >   {"return": {}}
> > >   {"execute": "device_add", "arguments": {"bus": "scsi1.0", "drive":
> > > "hd0", "driver": "scsi-hd", "id": "scsi-hd1"}}
> > > -{"error": {"class": "GenericError", "desc": "Cannot change iothread
> > > of active block backend"}}
> > > +{"return": {}}
> > >   {"execute": "device_del", "arguments": {"id": "scsi-hd0"}}
> > >   {"return": {}}
> > >   {"execute": "device_add", "arguments": {"bus": "scsi1.0", "drive":
> > > "hd0", "driver": "scsi-hd", "id": "scsi-hd1"}}
> > > -{"return": {}}
> > > +{"error": {"class": "GenericError", "desc": "Duplicate device ID
> > > 'scsi- hd1'"}}
> > >   {"execute": "device_del", "arguments": {"id": "scsi-hd1"}}
> > >   {"return": {}}
> > >   {"execute": "blockdev-del", "arguments": {"node-name": "hd0"}}
> > > Failures: 240
> > > Failed 1 of 1 iotests
> > > 
> > > Could you please have a look?
> > 
> > Ping!
> > 
> > The problem still persists in QEMU 10.0 :-(
> 
> Ping^2 !
> 
> It's still failing. Could anybody please have a look?

Hi Thomas,
I will take a look on Thursday.

Stefan

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