From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 197875] Processes hang on attempted access of WDC WD30-EZRX 3TB
 HDD on HP Z420 Workstation
Date: Wed, 29 Nov 2017 16:36:47 +0000
Message-ID: <bug-197875-11613-JJxgs57LuM@https.bugzilla.kernel.org/>
References: <bug-197875-11613@https.bugzilla.kernel.org/>
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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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