[GHC] #4362: error in multithreaded program "epollControl: does not exist (No such file or directory)"

[GHC]

#4362: error in multithreaded program "epollControl: does not exist (No such file
or directory)"
------------------------------------------+---------------------------------
  Reporter:  guest                        |          Owner:       
      Type:  bug                          |         Status:  new  
  Priority:  normal                       |      Milestone:  7.0.2
 Component:  libraries/base               |        Version:  7.1  
Resolution:                               |       Keywords:       
  Testcase:                               |      Blockedby:       
Difficulty:                               |             Os:  Linux
  Blocking:                               |   Architecture:  x86  
   Failure:  Incorrect result at runtime  |  
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Changes (by StefanWehr):

  * status:  closed => new
  * resolution:  invalid =>


Comment:

 The system call activities you've observed were caused by the sample
 program, however, the {{{epoll}}} problem is still there after removing
 the source for these activities.

 I've attached a new version of the sample programs, which fixes two
 things:

  * It ensures that no socket operation is performed on a socket after it
 has been closed. I also checked the output of stract: no more recvfrom
 after a close without an intervening open.
  * It replaces http-enumerator with a very simply HTTP download function.

 The server still produces the epoll errors after the clients have been
 connected. As before, stopping the clients also stops the epoll errors
 from happening. Starting the clients again causes the epoll error to
 appear again. Also as before, the epoll errors disappear if the clients
 close their sockets explicitly via sClose (see the line with the comment
 in Clients.hs).

 I've also run the sample program under MacOSX (which does not support
 epoll). No problems on this platform.

 GHC Version: 7.0.1

 OS: Linux 2.6.34-gentoo-r1

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4362#comment:13>
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