CURRENT r331284: crashing with USB

From: Hartmann, O. <>
Date: Wed, 21 Mar 2018 12:07:18 +0100

Incident: CURRENT r331284 can be brought down reliably with an USB
flash drive plugged in and out without mounting or doing anything with

I first recognized the incident with a ZFS on a SanDisk 32GB USB 3.0
flash drive. Plugging the USB flash and typing "zpool import" revealed
the very first time I issue this command the existence of the ZFS
fielsystem. Usually, I import then this USB drive for maintenance
purposes. Now, typing "zpool import" a second time, nothing is shown at
all. I see that umass0 has been destroyed - although the USB drive is
still plugged in.

Pulling the USB flash drive without having actually imported the
ZFS makes CURRENT crash and reboot.

I tried different USB flash drives, 3.0, 2.0, different boxes running
CURRENT, different hardware (Notebooks, Fujitsu workstations, HP
servers). It seems that the USB subsystem does have a serious problem -
not the ZFS. I can plugin the USB and then unplug it and after two or
three times doing this, the box goes down.

Does anyone else observe this bug?

By the way: all ZFS USB drives I use or all other USB flash drives
cause no problem on FreeBSD 11.1-RELENG-p7!

Kind regards,

Received on Wed Mar 21 2018 - 10:07:27 UTC

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