[Bug 196136] New: gbde and "zpool create" -> locks up the computer

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196136

            Bug ID: 196136
           Summary: gbde and "zpool create" -> locks  up the computer
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: david at bitmail.cc

i'm trying to encrypt my external hard drive and am following the guide at
https://www.freebsd.org/doc/handbook/disks-encrypting.html

with UFS, i have no problems creating the filesystem. all works as expected.
however, i wanted to use ZFS instead: when i type "zpool create backup
/dev/da0p1.bde" the CPU usage goes through the roof (system CPU according to
top), and eventually the whole computer becomes unresponsive and locks up. i've
tried it multiple times with the same results. 

# gpart show da0
=>        40  7814037088  da0  GPT  (3.6T)
          40  7814037080    1  freebsd-zfs  (3.6T)
  7814037120           8       - free -  (4.0K)

# dmesg | grep da0
da0 at umass-sim0 bus 0 scbus9 target 0 lun 0
da0: <TOSHIBA MD04ACA400 0> Fixed Direct Access SCSI-6 device 
da0: Serial Number         X4RGK50ZFSBA
da0: 40.000MB/s transfers
da0: 3815447MB (7814037168 512 byte sectors: 255H 63S/T 486401C)
da0: quirks=0x2<NO_6_BYTE>

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