[Bug 20852] New: Strange memory corruption in test_FindFirstChangeNotification

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20852

           Summary: Strange memory corruption in
                    test_FindFirstChangeNotification
           Product: Wine
           Version: 1.1.33
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: download, source, testcase
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: dank at kegel.com


http://kegel.com/wine/valgrind/logs/2009-10-21-19.42/vg-kernel32_change.txt
(and probably for as long as I've been running valgrind) have the warning

 Invalid write of size 4
    at  RtlFreeAnsiString (rtlstr.c:170)
    by  RemoveDirectoryW (path.c:1350)
    by  RemoveDirectoryA (path.c:1364)
    by  test_FindFirstChangeNotification (change.c:182)
    by  func_change (change.c:883)
    by  run_test (test.h:535)
    by  main (test.h:585)
  Address 0x7f21eeac is on thread 1's stack

Inserting a function call in RemoveDirectoryW()
(anywhere) sometimes makes the warning go away.

It seems that the first function call after the unix 
rmdir() at
http://source.winehq.org/source/dlls/kernel32/path.c#L1349
triggers this warning...
even if the function call is just a print statement.

To reproduce:
 install valgrind (after applying the workaround
for the regression that keeps wine from working,
https://bugs.kde.org/show_bug.cgi?id=205541#c1 )
 build wine
 cd ~/wine-git/dlls/kernel32/tests
 ~/wine-git/wine winemine &
 valgrind --trace-children=yes ~/wine-git/wine kernel32_test.exe.so change.c

It still happens if I comment out all but
test_FindFirstChangeNotification()
at the bottom of change.c.

This could also be a bug in valgrind, I suppose; I filed an issue
there for this a while ago as https://bugs.kde.org/show_bug.cgi?id=211701

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