Hello. Incident: CURRENT r331284 can be brought down reliably with an USB flash drive plugged in and out without mounting or doing anything with it. 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, OliverReceived on Wed Mar 21 2018 - 10:07:27 UTC
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