[GHC] #9722: ghcirun004 intermittently fails with ghc: ioManagerWakeup: write: Bad file descriptor

[GHC]

#9722: ghcirun004 intermittently fails with ghc: ioManagerWakeup: write: Bad file
descriptor
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                   Owner:  simonmar
            Type:  bug               |                  Status:  patch
        Priority:  high              |               Milestone:  7.10.1
       Component:  Runtime System    |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:  ghcirun004
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D714
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => patch
 * differential:   => Phab:D714


Comment:

 I have a workaround patch which sets the 'GC idle time' for ghci tests to
 0.3 seconds, which is the
 [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/runtime-
 control.html#rts-options-gc default] for user programs. This prevents the
 bug from triggering.

 We can keep this ticket open until the real bug is fixed.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9722#comment:15>
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