[Bug 197875] Processes hang on attempted access of WDC WD30-EZRX 3TB HDD on HP Z420 Workstation

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=197875

--- Comment #5 from Bart Van Assche (bvanassche@acm.org) ---
So command processing got stuck. Since there are two code paths in recent
kernels we need to know whether or not scsi-mq was used. Hence please provide
the output of the following command:

for d in /sys/block/*; do sfx=""; [ -e "$d/mq" ] && sfx=" [mq]"; echo "$d$sfx";
done

If the above command reports that scsi-mq is being used for the WDC disk,
please check whether the following command resolves the lockup:

for d in /sys/kernel/debug/block/*/state; do echo kick >$d; done

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