https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205166

            Bug ID: 205166
           Summary: OS craching on USB connection.
           Product: Base System
           Version: 10.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: freebsd-usb@FreeBSD.org
          Reporter: agni...@gmail.com

I have home server:
http://www.gigabyte.com/products/product-page.aspx?pid=5118#ov
this computer have 3 USB ports, two USB 2.0 and one USB 3.0. On USB 2.0 ports I
have two external USB storages and they are mirrored with gmirror. When I
connect USB 3.0 storage to USB 3.0 port OS crashing or new attached on top of
one of USB 2.0. For example:
Dec  4 09:56:26 server kernel: da0 at umass-sim0 bus 0 scbus1 target 0 lun 0
Dec  4 09:56:26 server kernel: da0: <WD 5000AAV External 1.65> Fixed Direct
Access SPC-2 SCSI device
Dec  4 09:56:26 server kernel: da0: Serial Number
57442D574341554631333931313437
Dec  4 09:56:26 server kernel: da0: 40.000MB/s transfers
Dec  4 09:56:26 server kernel: da0: 476940MB (976773168 512 byte sectors: 255H
63S/T 60801C)
Dec  4 09:56:26 server kernel: da0: quirks=0x2<NO_6_BYTE>
Dec  4 09:56:26 server kernel: da1 at umass-sim1 bus 1 scbus2 target 0 lun 0
Dec  4 09:56:26 server kernel: da1: <WD 5000AAV External 1.65> Fixed Direct
Access SPC-2 SCSI device
Dec  4 09:56:26 server kernel: da1: Serial Number
57442D574341554631343634353130
Dec  4 09:56:26 server kernel: da1: 40.000MB/s transfers
Dec  4 09:56:26 server kernel: da1: 476940MB (976773168 512 byte sectors: 255H
63S/T 60801C)
Dec  4 09:56:26 server kernel: da1: quirks=0x2<NO_6_BYTE>

On top on da1:
Dec  4 21:39:32 server kernel: da1 at umass-sim1 bus 1 scbus2 target 0 lun 0
Dec  4 21:39:32 server kernel: da1: <ASMT 2105 0> Fixed Direct Access SPC-4
SCSI device
Dec  4 21:39:32 server kernel: da1: Serial Number 123456789012
Dec  4 21:39:32 server kernel: da1: 400.000MB/s transfers
Dec  4 21:39:32 server kernel: da1: 2861588MB (5860533168 512 byte sectors:
255H 63S/T 364801C)
Dec  4 21:39:32 server kernel: da1: quirks=0x2<NO_6_BYTE>
Dec  4 21:41:28 server kernel: da1 at umass-sim1 bus 1 scbus2 target 0 lun 0
Dec  4 21:41:28 server kernel: da1: <ASMT 2105 0> s/n 123456789012 detached

Crash example:

Dec  4 09:56:26 server syslogd: kernel boot file is /boot/kernel/kernel
Dec  4 09:56:26 server kernel: panic: initiate_write_inodeblock_ufs2: already
started
Dec  4 09:56:26 server kernel: cpuid = 0
Dec  4 09:56:26 server kernel: KDB: stack backtrace:
Dec  4 09:56:26 server kernel: #0 0xffffffff80984e30 at kdb_backtrace+0x60
Dec  4 09:56:26 server kernel: #1 0xffffffff809489e6 at vpanic+0x126
Dec  4 09:56:26 server kernel: #2 0xffffffff809488b3 at panic+0x43
Dec  4 09:56:26 server kernel: #3 0xffffffff80b84c1a at
softdep_disk_io_initiation+0x10ca
Dec  4 09:56:26 server kernel: #4 0xffffffff80ba432e at ffs_geom_strategy+0x15e
Dec  4 09:56:26 server kernel: #5 0xffffffff809d0372 at bufwrite+0x142
Dec  4 09:56:26 server kernel: #6 0xffffffff809d2ac1 at vfs_bio_awrite+0x3d1
Dec  4 09:56:26 server kernel: #7 0xffffffff809dc7a1 at vop_stdfsync+0x241
Dec  4 09:56:26 server kernel: #8 0xffffffff8082f306 at devfs_fsync+0x26
Dec  4 09:56:26 server kernel: #9 0xffffffff80e72a47 at VOP_FSYNC_APV+0xa7
Dec  4 09:56:26 server kernel: #10 0xffffffff809efc8b at sched_sync+0x3ab
Dec  4 09:56:26 server kernel: #11 0xffffffff8091244a at fork_exit+0x9a

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