Re: [PATCH] SCSI: delay run queue if device is blocked in scsi_dev_queue_ready()

Johannes Thumshirn
2017-12-04T08:19:33Z

Hi Ming,

Ming Lei <ming.lei@redhat.com> writes:
> This issue can be triggered by the following script:
>
> #!/bin/sh
> rmmod scsi_debug
> modprobe scsi_debug max_queue=1
>
> DEVICE=`ls -d /sys/bus/pseudo/drivers/scsi_debug/adapter*/host*/target*/*/block/* | head -1 | xargs basename`
>
> DISK_DIR=`ls -d /sys/block/$DEVICE/device/scsi_disk/*`
>
> echo "using scsi device $DEVICE"
> echo "-1" >/sys/bus/pseudo/drivers/scsi_debug/every_nth
> echo starting loop $i
> echo "temporary write through" >$DISK_DIR/cache_type
> echo "128" >/sys/bus/pseudo/drivers/scsi_debug/opts
> echo none > /sys/block/$DEVICE/queue/scheduler
> dd if=/dev/$DEVICE of=/dev/null bs=1M iflag=direct count=1 &
> sleep 5
> echo "0" >/sys/bus/pseudo/drivers/scsi_debug/opts
> wait
> echo "SUCCESS"

Can you please submit a test-case for blktest as well, given you have a
nice reproducer?

Thanks,
Johannes
--
Johannes Thumshirn Storage
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