[Bug 10141] New: Valgrind reports heap error early in wine startup

http://bugs.winehq.org/show_bug.cgi?id=10141

Summary: Valgrind reports heap error early in wine startup
           Product: Wine
           Version: CVS/GIT
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: wine-misc
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Sometimes on my core 2 gutsy laptop, warn+heap make test
fails in msvcrt on tests/heap.c, so I tried it under
valgrind:

$ cd dlls/msvcrt/tests
$ WINEDEBUG=warn+heap valgrind --trace-children=yes
--suppressions=$HOME/supp.txt ../../../tools/runtest -P wine -M msvcrt.dll -T
../../.. -p msvcrt_test.exe.so heap.c

(where supp.txt is system dependent and optional; it just skips false
positives.  I'll attach mine.)

Here's the first error in the output:

==12738== Invalid write of size 1
==12738==    at 0x4023894: memset (mc_replace_strmem.c:490)
==12738==    by 0x43F178E: HEAP_CreateFreeBlock (heap.c:143)
==12738==    by 0x43F184D: HEAP_ShrinkBlock (heap.c:567)
==12738==    by 0x43F24D9: RtlAllocateHeap (heap.c:1220)
==12738==    by 0x43F8FBA: load_builtin_callback (loader.c:1256)
==12738==    by 0x402CABC: wine_dll_set_callback (loader.c:480)
==12738==    by 0x43F61C7: __wine_process_init (loader.c:2504)
==12738==    by 0x402C448: wine_init (loader.c:645)
==12738==    by 0x7BF0139A: main (main.c:111)
==12738==  Address 0x7F000140 is not stack'd, malloc'd or (recently) free'd

Amusingly, this error happens regardless of what app you try to run,
even a nonexistant one emits the same error, e.g.
$ WINEDEBUG=warn+heap valgrind --trace-children=yes
--suppressions=$HOME/supp.txt xyzzy

Is this real, or a false positive?  Maybe somebody just forgot
an annotation in ntdll?