On Wed, Aug 01, 2018 at 07:52:19PM +0800, Ming Lei wrote:
> On Wed, Aug 01, 2018 at 12:24:00PM +0100, Matt Hart wrote:
> > On 1 August 2018 at 11:59, Mark Brown <broo...@kernel.org> wrote:
> > > On Wed, Aug 01, 2018 at 06:51:09PM +0800, Ming Lei wrote:
> > >
> > >> You may have to provide some clue, such as dmesg log, boot disk, ...
> > >
> > >> I guess you don't use virtio-scsi/virtio-blk since both run at blk-mq
> > >> mode at default, even though without d5038a13eca72fb.
> > >
> > > Boot logs and so on can be found here:
> > >
> > >     https://kernelci.org/boot/id/5b618c9f59b514931f96ba97/
> > >     https://kernelci.org/boot/id/5b618ca359b514904d96bac5/
> > >     https://kernelci.org/boot/id/5b618cbc59b51492e896baad/
> > >
> > > (these are today's but the symptoms are the same.)  The ramdisk is
> > > unfortunately not linked through the UI, though we don't get that far.
> > 
> > And a full LAVA boot log from my lab
> > http://lava.streamtester.net/scheduler/job/138067
> > 
> > QEMU command line here:
> > http://lava.streamtester.net/scheduler/job/138067#L75
> > 
> > And a LAVA job definition, which includes the url of the ramdisk and kernel:
> > http://lava.streamtester.net/scheduler/job/138067/definition#defline76
> > 
> 
> Thanks for the sharing!
> 
> I can reproduce this issue with above script/initrd/kernel config, and looks
> the issue disappeared after 'scsi_mod.use_blk_mq=0' is passed.
> 
> Not see such issue with zero-day ktest config.
> 
> Looks a bit weird, given SCSI_MQ is nothing related with ramdisk.

Seems related with sr:

1) with scsi-mq
[    2.808204] ata2.01: NODEV after polling detection
[    2.809807] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[    2.827377] scsi 1:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ 
PQ: 0 ANSI: 5

2) without scsi_mq
[    5.549135] ata2.01: NODEV after polling detection
[    5.554404] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[    5.596143] scsi 1:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ 
PQ: 0 ANSI: 5
[    5.637126] sr 1:0:0:0: [sr0] scsi3-mmc drive: 4x/4x cd/rw xa/form2 tray
[    5.637870] cdrom: Uniform CD-ROM driver Revision: 3.20
[    5.648940] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    5.661605] sr 1:0:0:0: Attached scsi generic sg0 type 5


We may need to take a look at recent SCSI change.

Thanks,
Ming

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