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FreeNAS server was randomly crashing:

(da0:umass-sim0:0:0:0): Retrying command
(da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 00 24 26 9d 00 00 10 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Error 5, Retries exhausted
root@freenas:/mnt/data #

The USB drive is causing this.

root@wine:~ # usbconfig
ugen0.1: <Intel EHCI root HUB> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
ugen1.1: <Intel EHCI root HUB> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
ugen1.2: <vendor 0x8087 product 0x0024> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
ugen0.2: <vendor 0x8087 product 0x0024> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (0mA)
ugen0.3: <SanDisk Cruzer Blade> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (224mA)

root@wine:~ # usbconfig -u 0 -a 3 dump_device_desc
ugen0.3: <SanDisk Cruzer Blade> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (224mA)

  bLength = 0x0012
  bDescriptorType = 0x0001
  bcdUSB = 0x0210
  bDeviceClass = 0x0000  <Probed by interface class>
  bDeviceSubClass = 0x0000
  bDeviceProtocol = 0x0000
  bMaxPacketSize0 = 0x0040
  idVendor = 0x0781
  idProduct = 0x5567
  bcdDevice = 0x0100
  iManufacturer = 0x0001  <SanDisk>
  iProduct = 0x0002  <Cruzer Blade>
  iSerialNumber = 0x0003  <4C531001561109121142>
  bNumConfigurations = 0x0001

Switched to a different USB stick and the problem went away.

Lesson: Not all USB sticks are created equally.

FreeNAS