3.15rc2 hanging processes on exit.

[Dave Jones]

I've got a test box that's running my fuzzer that is in an odd state.
The processes are about to end, but they don't seem to be making any
progress.  They've been spinning in the same state for a few hours now..

perf top -a is showing a lot of time is being spent in page_fault and bad_gs

there's a large trace file here from the function tracer:
http://codemonkey.org.uk/junk/trace.out

	Dave

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