Re: blktests failures with v5.19-rc1

[Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

On Jun 15, 2022 / 17:16, Keith Busch wrote:
> 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

Hello Bjorn,

Did you have chance to reproduce the WARN? Recently, it was reported again [1]
and getting attention.

[1] https://lore.kernel.org/linux-block/4ed3028b-2d2f-8755-fec2-0b9cb5ad42d2@fujitsu.com/

-- 
Shin'ichiro Kawasaki