[GHC] #14346: 8.2.1 regression: heap corruption after safe foreign calls

[GHC]

#14346: 8.2.1 regression: heap corruption after safe foreign calls
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        Reporter:  andrewchen        |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  highest           |            Milestone:
       Component:  Runtime System    |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by andrewchen):

 I am running arch linux x64 on a i5-4200U laptop.

 I'm able to reproduce with just the system ghc:
 {{{
 ghc Main.hs test.c -threaded -O1 -fforce-recomp
 [1 of 1] Compiling Main             ( Main.hs, Main.o )
 Linking Main ...
 }}}

 For me the program fails within seconds:
 {{{
 $ time ./Main
 value mismatch
 value mismatch
 value mismatch
 value mismatch
 zsh: segmentation fault (core dumped)  ./Main
 ./Main  2.19s user 0.20s system 67% cpu 3.553 total
 }}}

 I'm also able to reproduce the issue in a fedora virtual machine on the
 same physical machine using ghc 8.2.1 binaries downloaded from
 haskell.org.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14346#comment:3>
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