Thought I would add a couple more observations that I've made regarding the use
of DLLs vs static libs. I played around a little with compiling and running the
test applications in mpatrol/tests/fail.

1) If I compile and link the test application against the static mpatrol
library, all works as expected.

2) If I compile and link the test application against the mpatrol DLL, I get a
crash when I run.

3) If I compile my executable against the static mpatrol library, all works as
expected.

4) If I compile my executable against the mpatrol DLL, I get a crash when I
run. This is the exact situation of my original post.

5) I compile my executable against the static mpatrol library. But, this time,
my application contains calls against another DLL (call it "myappDLL"), so I
link my application against myappDLL. Regardless of whether myappDLL is
compiled against mpatrol static lib or mpatrol DLL, I get a crash.

6) Same as #5, but this time I do not compile myappDLL against mpatrol. All
works as expected (but I want to have all of my app DLLs using mpatrol, so this
doesn't help me)

7) Same as #5, but instead of compiling my executable against myappDLL, I use
LoadLibrary and GetProcAddress to call into myappDLL. Regardless of whether
myappDLL is compiled against static or DLL version of mpatrol, I get a crash
upon call to LoadLibrary.

I've read Greg Chicares' investigation documents posted in the files section of
this group, but I don't see anything in his work about crashes, only errors and
corruption in the log file.


--- In mpatrol@yahoogroups.com, "greg80303" <grutz@...> wrote:
>
> Windows XP SP3 / MinGW
>
> I have downloaded the 1.5.1 SVN tag tree and built it myself. I simply went
into <mpatrol>/build/windows and executed "make -f Makefile.mingw all", then
copied the include files to my include directory and the mpatrolmt.dll file to
the same directory as my executable.
>
> I am trying to use mpatrol to do some memory analysis on a piece of software.
The complete system is pretty complex, but I am starting with only a small
piece. Our "launcher" is a simple executable that does some reading of
configuration files and then calls DLL entry points (via
LoadLibrary/GetProcAddress) to start the rest of the system. So, the launcher
itself is not linked against any external DLLs from our system.
>
> The compile line for my launcher looks something like this:
>
> gcc -c -mno-cygwin -g -DRI_HAVE_STDINT_H -Wall -Ic:/<myproject>/include
-include mpatrol.h -I./Win32 main.c -o
c:/<myproject>/gen/Win32/debug/launcher/main.o
>
> gcc -c -mno-cygwin -g -DRI_HAVE_STDINT_H -Wall -Ic:/<myproject>/include
-include mpatrol.h -I./Win32 -Ic:/<myproject>/include Win32/port.c -o
c:/<myproject>/gen/Win32/debug/launcher/./Win32/port.o
>
> g++ -mno-cygwin -o c:/<myproject>/install/Win32/debug/bin/ri.exe
c:/<myproject>/gen/Win32/debug/launcher/main.o
c:/<myproject>/gen/Win32/debug/launcher/./Win32/port.o
-Lc:/<myproject>/install/Win32/debug/bin -lmpatrolmt
>
> The program crashes before ever getting to my main(). Running in GDB, I get
the following SIGSEGV notification:
>
> (gdb) run
> Starting program: c:/<myproject>/install/Win32/debug/bin/ri.exe
c:/<myproject>/launcher/launcher_win32.cfg
> [New thread 656.0xaac]
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x7c9104da in ntdll!RtlStatMemoryStream () from C:\WINDOWS\system32\ntdll.dll
> (gdb)
>
> The mpatrol.log file is created and there is some information in it. So, I
rebuilt mpatrol with debug symbols and put a breakpoint in __mp_printversion()
to see if I could learn anything.
>
> (gdb) run
> Starting program: c:/<myproject>/install/Win32/debug/bin/ri.exe
c:/<myproject>/src/launcher/launcher_win32.cfg
> [New thread 1108.0xd7c]
>
> Breakpoint 1, __mp_printversion () at ../../src/diag.c:1805
> (gdb) where
> #0 __mp_printversion () at ../../src/diag.c:1805
> #1 0x004d575f in __mp_init () at ../../src/inter.c:508
> #2 0x004d5f8a in __mp_alloc (l=128, a=0, f=AT_MALLOC, s=0x0, t=0x0, u=0,
g=0x0, h=0, k=1) at ../../src/inter.c:873
> #3 0x004da8d1 in malloc (l=128) at ../../src/malloc.c:55
> #4 0x004c10c3 in DllMainCRTStartup@12 () from
c:\<myproject>\install\Win32\debug\bin\mpatrolmt.dll
> #5 0x7c90118a in ntdll!LdrSetAppCompatDllRedirectionCallback () from
C:\WINDOWS\system32\ntdll.dll
> #6 0x004c0000 in ?? ()
> #7 0x00000001 in ?? ()
> #8 0x0022fd30 in ?? ()
> #9 0x004c1060 in __dll_exit () from
c:\<myproject>\install\Win32\debug\bin\mpatrolmt.dll
> #10 0x7c91c4da in ntdll!LdrHotPatchRoutine () from
C:\WINDOWS\system32\ntdll.dll
> #11 0x7c921194 in ntdll!RtlMapGenericMask () from
C:\WINDOWS\system32\ntdll.dll
> #12 0x7c92108f in ntdll!RtlMapGenericMask () from
C:\WINDOWS\system32\ntdll.dll
> #13 0x7c90e437 in ntdll!LdrCreateOutOfProcessImage () from
C:\WINDOWS\system32\ntdll.dll
>
> I can step all the way through until I am back in the DllMainCRTStartup
function. Then, the next step causes the crash. Any ideas for me? Any more
information I could provide to help?
>
> Greg
>