[GHC] #11406: RTS gets stuck in scheduleDetectDeadlock()

[GHC]

#11406: RTS gets stuck in scheduleDetectDeadlock()
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonmar):

 This is probably an infinite loop, i.e. a blackhole.  The trace you added
 forces something too early and causes a deadlock.

 For some reason we don't detect and report blackhole loops as `<<loop>>`
 in GHC, that is probably worth investigating.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11406#comment:1>
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