blktests failures with v5.19-rc1

[Keith Busch]

On Wed, Jun 15, 2022 at 02:47:27PM -0500, Bjorn Helgaas wrote:
> On Tue, Jun 14, 2022 at 04:00:45AM +0000, Shinichiro Kawasaki wrote:
> > 
> > Yeah, this WARN is confusing for us then it would be valuable to
> > test by blktests not to repeat it. One point I wonder is: which test
> > group the test case will it fall in? The nvme group could be the
> > group to add, probably.
> > 
> > Another point I wonder is other kernel test suite than blktests.
> > Don't we have more appropriate test suite to check PCI device
> > rescan/remove race ? Such a test sounds more like a PCI bus
> > sub-system test than block/storage test.
> 
> I'm not aware of such a test, but it would be nice to have one.
> 
> Can you share your qemu config so I can reproduce this locally?
> 
> Thanks for finding and reporting this!

Hi Bjorn,

This ought to be reproducible with any pci device that can be removed. Since we
initially observed with nvme, you can try with such a device. A quick way to
get one appearing in qemu is to add parameters:

        -drive id=n,if=none,file=null-co://,format=raw \
	-device nvme,serial=foobar,drive=n