On 3/26/22 01:57, Oleksij Rempel wrote:
On Fri, Mar 25, 2022 at 10:05:43AM -0700, Bart Van Assche wrote:
On 3/25/22 05:33, Oleksij Rempel wrote:
I have regression on iMX6 + USB storage device with this patch.
After plugging USB Flash driver (in my case USB3 Intenso 32GB) and
running mount /dev/sda1 /mnt, the command will never exit.
Reverting this patchs (322cff70d46) on top of v5.17 solves it for me.
How can I help you to debug this issue?
That is unexpected. Is there perhaps something special about the USB
stick for which the hang occurs, e.g. the queue depth it supports is
low? Can you please share the output of the following commands after
having inserted the USB stick that triggers the hang?
(cd /sys/class && grep -aH . scsi_host/*/can_queue scsi_device/*/device/{blacklist,inquiry,model,queue*,vendor}) | sort
Here it is:
root@test:/sys/class cat scsi_host/*/can_queue
1
root@test:/sys/class cat scsi_device/*/device/blacklist
root@test:/sys/class cat scsi_device/*/device/inquiry
Intenso Speed Line 1.00
root@test:/sys/class cat scsi_device/*/device/model
Speed Line
root@test:/sys/class cat scsi_device/*/device/queue*
1
none
root@test:/sys/class cat scsi_device/*/device/vendor
Intenso
I do not know, if there is something special about it. If needed, i can
take it apart to see what controller is used.
Thanks, this helps a lot. can_queue = 1 as I was suspecting. In a quick
test I noticed that I/O is about 10x slower for queue depth 1 and the
v5.17 mq-deadline scheduler. I will take a closer look at this tomorrow.
Bart.
