[GHC] #7993: ghc 7.6 (not 7.4) sometimes hangs at child process exit on s390x

[GHC]

#7993: ghc 7.6 (not 7.4) sometimes hangs at child process exit on s390x
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        Reporter:  cjwatson        |            Owner:
            Type:  bug             |           Status:  new
        Priority:  normal          |        Milestone:
       Component:  Runtime System  |          Version:  7.6.3
      Resolution:                  |         Keywords:
Operating System:  Linux           |     Architecture:  Other
 Type of failure:  Other           |       Difficulty:  Unknown
       Test Case:                  |       Blocked By:
        Blocking:                  |  Related Tickets:
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Changes (by pmylund):

 * cc: simonmar (added)


Comment:

 I am experiencing the same issue, but on x86_64, and with my own
 application which uses GHC (7.6.2) threads. On occasion a thread will loop
 forever, and give the same kind of output from strace. (Is it the same
 issue?)

 Unfortunately I don't know how to begin troubleshooting. Whatever I do to
 try to reproduce it in a smaller test, the problem goes away if I don't
 use the combination of threads, STM and exception handling that I have in
 my larger application.

 I will keep trying and report back, but any input is appreciated.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7993#comment:3>
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