[Bug 200737] panic writing to usb disk

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200737

            Bug ID: 200737
           Summary: panic writing to usb disk
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: freebsd-usb at FreeBSD.org
          Reporter: walter at pelissero.de

Created attachment 157575
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=157575&action=edit
Panic screen

WD 2TB SATA disk in a USB dock.
The dock is detected as:

Jun  9 16:13:47 sandokan kernel: da0 at umass-sim0 bus 0 scbus13 target 0 lun 0
Jun  9 16:13:47 sandokan kernel: da0: <asmedia ASMT1153e 0> Fixed Direct Access
SPC-4 SCSI device
Jun  9 16:13:47 sandokan kernel: da0: Serial Number 123456789596
Jun  9 16:13:47 sandokan kernel: da0: 40.000MB/s transfers
Jun  9 16:13:47 sandokan kernel: da0: 1907729MB (3907029168 512 byte sectors:
255H 63S/T 243201C)
Jun  9 16:13:47 sandokan kernel: da0: quirks=0x2<NO_6_BYTE>

Trying to rsync a directory tree to it, yields after a while a panic (see
screen shots).
For the benefit of the search engine here is the transcript:

READ(10) CDB: 28 00 cc 23 44 40 00 00 40 00
CAM Status: Scsi Status Error
SCSI status: check condition
SCSI sense: medium error asc:11,0 (Unrecovered read error)
Error 5: unretryable error 
[...]
g_vfs_done(): label/odeon.eli[WRITE(offset=..., legnth=...)]error = 5
Panic: cannot reassign paging buffer

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