[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
-------------------------------------+-------------------------------------

Comment (by AndreasVoellmy):

 I'll keep trying to reproduce... in the meantime, can you try to recompile
 ghc with the following definition in rts/posix/Signals.c? Then recreate
 the bug and we will hopefully have a bit more info to help debug:

 {{{
 void
 ioManagerWakeup (void)
 {
     int r;
     int fd;
     // Wake up the IO Manager thread by sending a byte down its pipe
     if (io_manager_wakeup_fd >= 0) {
 #if defined(HAVE_EVENTFD)
         StgWord64 n = (StgWord64)IO_MANAGER_WAKEUP;
         fd = io_manager_wakeup_fd;
         r = write(fd, (char *) &n, 8);
 #else
         StgWord8 byte = (StgWord8)IO_MANAGER_WAKEUP;
         fd = io_manager_wakeup_fd;
         r = write(fd, &byte, 1);
 #endif
         if (r == -1) {
             perror("ioManagerWakeup: write(A)");
             sysErrorBelch("ioManagerWakeup: write; fd: %d", fd);
         }
     }
 }
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9722#comment:23>
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