Sergei Trofimovich authored Jul 07, 2015 and Ben Gamari committed Jul 07, 2015

Alexander found a interesting case:
1. We have a queue of two waiters in a blocked_queue
2. first file descriptor changes state to RUNNABLE,
   second changes to INVALID
3. awaitEvent function dequeued RUNNABLE thread to a
   run queue and attempted to dequeue INVALID descriptor
   to a run queue.

Unqueueing INVALID fails thusly:
        #3  0x000000000045cf1c in barf (s=0x4c1cb0 "removeThreadFromDeQueue: not found")
                               at rts/RtsMessages.c:42
        #4  0x000000000046848b in removeThreadFromDeQueue (...) at rts/Threads.c:249
        #5  0x000000000049a120 in removeFromQueues (...) at rts/RaiseAsync.c:719
        #6  0x0000000000499502 in throwToSingleThreaded__ (...) at rts/RaiseAsync.c:67
        #7  0x0000000000499555 in throwToSingleThreaded (..) at rts/RaiseAsync.c:75
        #8  0x000000000047c27d in awaitEvent (wait=rtsFalse) at rts/posix/Select.c:415

The problem here is a throwToSingleThreaded function that tries
t...