[GHC] #15038: Memory Corruption (strange closure type)

[GHC]

#15038: Memory Corruption (strange closure type)
-------------------------------------+-------------------------------------
        Reporter:  andrewthad        |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9718             |  Differential Rev(s):  Phab:D4652
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 > I also realized that unarise uses absentError wrong: absentError expects
 an Addr# argument (for a string that represents the "absent" argument) but
 unarise just uses absentError without an argument. So there's also a type
 error.

 I think your patch is to fix this problem.  But I see nothing about giving
 it an argument of the right type ... I see stuff about not giving it an
 argument at all for some reason; and strange stable pointers.

 If we are going to fix #9718, how much of this do we need?   Perhaps very
 little?

 At least, if there's
 1. something that is necessary regardless; and
 2. something that's a temporary sticking plaster to deal with the absence
 of #9718
 then let's keep them separate so we can revert (2) when we get #9718.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15038#comment:28>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler