[GHC] #8094: Intermittent segfault when using ghc-7.6.3 -e on OSX 10.6.8

[GHC]

#8094: Intermittent segfault when using ghc-7.6.3 -e on OSX 10.6.8
----------------------------------+----------------------------------
        Reporter:  rampion        |            Owner:
            Type:  bug            |           Status:  new
        Priority:  normal         |        Milestone:
       Component:  Compiler       |          Version:  7.6.3
      Resolution:                 |         Keywords:
Operating System:  MacOS X        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by rampion):

 The ghc-7.6.3 rebuilt from source doesn't seem to display the segfaulting
 behaviour:

 {{{
 % cd ~/ghc-7.6.3-installed/bin
 % ./ghc -e 0
 0
 % ./ghc -e 0
 0
 % ./ghc -e 0
 0
 }}}

 So I'm happy.  I ran `make test` on the install:

 {{{
 % cd ~/ghc-7.6.3-source
 % make test
 ...
 OVERALL SUMMARY for test run started at Fri Jul 26 03:41:47 EDT 2013
     3403 total tests, which gave rise to
    14437 test cases, of which
        0 caused framework failures
    11363 were skipped

     2982 expected passes
       47 had missing libraries
       35 expected failures
        0 unexpected passes
       10 unexpected failures

 Unexpected failures:
    ffi/should_run  fptr02 [bad exit code] (normal)
    ghci/linking    ghcilink003 [bad exit code] (normal)
    ghci/linking    ghcilink006 [bad exit code] (normal)
    perf/compiler   T4801 [stat too good] (normal)
    perf/compiler   T5642 [stat too good] (normal)
    perf/compiler   T6048 [stat not good enough] (optasm)
    perf/compiler   T783 [stat not good enough] (normal)
    perf/haddock    haddock.Cabal [stat not good enough] (normal)
    perf/haddock    haddock.base [stat not good enough] (normal)
    perf/haddock    haddock.compiler [stat not good enough] (normal)
 }}}

 So not perfect, but I'm not familiar enough with the test suite to say
 whether it's good enough.

 There still seem to be some weird linking issues, because when I moved my
 source directory to an alternate location, I got similar shared object
 warnings in gdb:

 {{{
 % mv ~/ghc-7.6.3-source ~/they-will-never-look-for-me-here
 % cd ~/ghc-7.6.3-installed/lib/ghc-7.6.3/
 % gdb ./ghc
 GNU gdb 6.3.50-20050815 (Apple version gdb-1515) (Sat Jan 15 08:33:48 UTC
 2011)
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you
 are
 welcome to change it and/or distribute copies of it under certain
 conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for
 details.
 This GDB was configured as "x86_64-apple-darwin"...Reading symbols for
 shared libraries .... done

 warning: Could not find object file
 "/Users/rampion/ghc-7.6.3-source/rts/dist/build/libHSrts_thr.a(prep_cif.o)"
 - no debug information available for "../src/prep_cif.c".


 warning: Could not find object file
 "/Users/rampion/ghc-7.6.3-source/rts/dist/build/libHSrts_thr.a(types.o)" -
 no debug information available for "../src/types.c".


 warning: Could not find object file
 "/Users/rampion/ghc-7.6.3-source/rts/dist/build/libHSrts_thr.a(ffi64.o)" -
 no debug information available for "../src/x86/ffi64.c".


 warning: Could not find object file
 "/Users/rampion/ghc-7.6.3-source/rts/dist/build/libHSrts_thr.a(darwin64.o)"
 - no debug information available for
 "/var/folders/E2/E2IvfJ2xE4C08q9IjJeZfE+++TI/-Tmp-//ccugdkbo.s".


 (gdb)
 }}}

 But this turns out to be not an indicator of whether the segfaulting
 behaviour will occur, as `~/ghc-7.6.3-installed/bin/ghc -e 0` still works
 fine consistently.

 Thanks! I'd be happy to package this build up for other Snow Leopard
 users, if you think that's appropriate.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8094#comment:2>
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