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The deprecated/deleted usbfs kernel driver gets really unhappy when
SELinux denies it access to directories. On flo (3.4.0 kernel), this
comes across as an SELinux denial followed by a kernel panic.

Steps to reproduce:

  1. plug in a USB device.
  2. notice nothing happens.
  3. unplug the USB device
  4. plug it in again, watch for restart.

Expected:
  USB device works

Actual:
  [329180.030242] Host mode: Set DC level as 0x68 for flo.
  [329180.030395] msm_hsusb_host msm_hsusb_host: Qualcomm On-Chip EHCI Host Controller
  [329180.030639] Unable to create devices usbfs file
  [329180.030944] type=1400 audit(1425327845.292:12): avc: denied { search } for pid=24033 comm="kworker/0:1" name="/" dev="usbfs" ino=291099 scontext=u:r:kernel:s0 tcontext=u:object_r:usbfs:s0 tclass=dir
  [329180.060394] msm_hsusb_host msm_hsusb_host: new USB bus registered, assigned bus number 1
  [329180.091583] msm_hsusb_host msm_hsusb_host: irq 132, io mem 0x12500000
  [deleted]
  [329180.120178...