Public bug reported:

I noticed that my Nexus 4 crashed while doing a

grep "1" -r /

in an adb shell as user phablet. After narrowing it down, it looks like
I can reliably crash my device by just doing a

cat /sys/devices/system/cpaccess/cpaccess0/cp_rw

as a normal user. After doing it about three times, all aspects of the
device still work as expected, but it no longer identifies itself via
USB, not even when in recovery mode. This might be a different issue,
but it has never happened before, so I do think it might have been
caused by the crashes.

** Affects: linux-mako (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1425290

Title:
  Reading from /sys/devices/system/cpaccess/cpaccess0/cp_rw crashes the
  Nexus 4

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