Anyone else failing to validate on 'linker_unload'?

[Edward Z. Yang]

Yes, this one is failing for me too. Probably related to the
recent object unload patch for http://ghc.haskell.org/trac/ghc/ticket/8039

Excerpts from Ryan Newton's message of Fri Aug 30 21:51:24 -0700 2013:
> That test builds an executable named 'linker_unload' which segfaults for
> me.  Valgrind says this:
> 
> 
>     ==42800== Invalid read of size 8
>     ==42800==    at 0x66945F: checkUnload (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x657F7A: GarbageCollect (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x651790: scheduleDoGC (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x6518B4: performGC_ (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x403BB1: main (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==  Address 0x5bfdd20 is 80 bytes inside a block of size 120
> free'd
>     ==42800==    at 0x4C273F0: free (vg_replace_malloc.c:446)
>     ==42800==    by 0x66945E: checkUnload (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x657F7A: GarbageCollect (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x651790: scheduleDoGC (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x6518B4: performGC_ (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
>     ==42800==    by 0x403BB1: main (in
> /home/beehive/ryan_scratch/validate14/testsuite/tests/rts/linker_unload)
> 
> This went the same across a couple different independent checkouts.
> 
>   -Ryan