Please disregard this message as I sent it to the wrong group. Sorry for the distraction. - Dave On Wed, 2007-08-15 at 13:57 -0400, David Daeschler wrote:

I'm sorry this post is so long, I'm looking for someone who may have experienced this, or knows enough about what I am rambling about to help me. I haven't been able to run our app built with MINGW for a week now, and It's starting to become a problem.

This is a followup to a previous post entitled "Wrong DLL init routine being called?". I am starting a new post because it appears as if the stack traces I was getting before were wrong. I now have more information, and feel I am closer to solving this.

When I try to load a test application I'm receiving the message:

"The application failed to initialize properly (0xc0000005). Click on OK to terminate the application."

I am not using auto-imports, so solutions referring to them have not helped me.

I have always been winding up in malloc during the crashes I've been experiencing in calls to DLL initialization routines. I've been able to get a stack trace that lands up inside dllcrt1.c (the STATIC MINGW runtime) and shows me which call to malloc is segfaulting. The stack trace is as follows:

#0 0x003e14a0 in malloc () #1 0x003e111c in DllMainCRTStartup@12 (hDll=0x3e0000, dwReason=1, lpReserved=0x22fd30) at dllcrt1.c:56 #2 0x7c9011a7 in ntdll!LdrSetAppCompatDllRedirectionCallback () from C:\WINDOWS\system32\ntdll.dll #3 0x003e0000 in ?? () #4 0x00000001 in ?? () #5 0x003e10c0 in __dll_exit () at dllcrt1.c:149 #6 0x00000000 in ?? ()

with frame 1 (inside dllcrt1.c) as:

(gdb) f 1 #1 0x003e111c in DllMainCRTStartup@12 (hDll=0x3e0000, dwReason=1, lpReserved=0x22fd30) at dllcrt1.c:56 56 first_atexit = (p_atexit_fn*) malloc (32 * sizeof (p_atexit_fn)); Current language: auto; currently c (gdb) list 51 #endif 52 53 /* Initialize private atexit table for this dll. 54 32 is min size required by ANSI */ 55 56 first_atexit = (p_atexit_fn*) malloc (32 * sizeof (p_atexit_fn)); 57 if (first_atexit == NULL ) /* can't allocate memory */ 58 { 59 errno=ENOMEM; 60 return FALSE;

Notice line 56. It seems innocent enough, how could a call to malloc be crashing? Well I called malloc from insidge gdb, and it worked fine, so I then dug further in and noticed that the malloc symbol that gdb is seeing is:

(gdb) print malloc $1 = {<text variable, no debug info>} 0x40c780 <malloc>

0x40c780, okay, lets see a disassembly:

Dump of assembler code for function malloc: 0x0040c780 <malloc+0>: jmp *0x41b1dc

So there is a jump to 0x41b1dc, sure enough that lands us inside of:

(gdb) disas 0x41b1dc Dump of assembler code for function _imp__malloc: 0x0041b1dc <_imp__malloc+0>: pop %es 0x0041b1dd <_imp__malloc+1>: les (bad),%eax 0x0041b1de <_imp__malloc+2>: ret $0x77

Ahh, import stub that leads us to:

(gdb) disas _imp__malloc Dump of assembler code for function msvcrt!malloc: 0x77c2c407 <msvcrt!malloc+0>: mov %edi,%edi 0x77c2c409 <msvcrt!malloc+2>: push %ebp 0x77c2c40a <msvcrt!malloc+3>: mov %esp,%ebp 0x77c2c40c <msvcrt!malloc+5>: cmpl $0x0,0x77c62418 0x77c2c413 <msvcrt!malloc+12>: jne 0x77c2c420 <msvcrt!malloc+25> 0x77c2c415 <msvcrt!malloc+14>: call 0x77c1ef38 <msvcrt!__initenv+77> 0x77c2c41a <msvcrt!malloc+19>: test %eax,%eax 0x77c2c41c <msvcrt!malloc+21>: jne 0x77c2c420 <msvcrt!malloc+25> 0x77c2c41e <msvcrt!malloc+23>: pop %ebp 0x77c2c41f <msvcrt!malloc+24>: ret 0x77c2c420 <msvcrt!malloc+25>: pushl 0x77c61808 0x77c2c426 <msvcrt!malloc+31>: pushl 0x8(%ebp) 0x77c2c429 <msvcrt!malloc+34>: call 0x77c2c3d4 <msvcrt!free+441> 0x77c2c42e <msvcrt!malloc+39>: pop %ecx 0x77c2c42f <msvcrt!malloc+40>: pop %ecx 0x77c2c430 <msvcrt!malloc+41>: pop %ebp 0x77c2c431 <msvcrt!malloc+42>: ret 0x77c2c432 <msvcrt!malloc+43>: int3 0x77c2c433 <msvcrt!malloc+44>: int3 0x77c2c434 <msvcrt!malloc+45>: int3 0x77c2c435 <msvcrt!malloc+46>: int3 0x77c2c436 <msvcrt!malloc+47>: int3 End of assembler dump.

Good, this is where I would expect to be, right at home inside of msvcrt. But now take a look at the first frame of our original stack trace.

#0 0x003e14a0 in malloc ()

0x3e14a0.. Umm, hmmm, wierd. Let's see where that leads us?

(gdb) disas 0x3e14a0 Dump of assembler code for function malloc: 0x003e14a0 <malloc+0>: jmp *0x90c0609c

I'd hate to say it, but there is no 0x90x0609c. That explains the segfault.

Let's see what else is around 0x3e14a0...

(gdb) disas 0x3e1490 Dump of assembler code for function _pei386_runtime_relocator: 0x003e1470 <_pei386_runtime_relocator+0>: mov $0x90c03034,%ecx 0x003e1475 <_pei386_runtime_relocator+5>: push %ebp 0x003e1476 <_pei386_runtime_relocator+6>: cmp $0x90c03034,%ecx 0x003e147c <_pei386_runtime_relocator+12>: mov %esp,%ebp 0x003e147e <_pei386_runtime_relocator+14>: jae 0x3e1498 <_pei386_runtime_relocator+40> 0x003e1480 <_pei386_runtime_relocator+16>: mov 0x4(%ecx),%edx 0x003e1483 <_pei386_runtime_relocator+19>: mov (%ecx),%eax 0x003e1485 <_pei386_runtime_relocator+21>: add $0x8,%ecx 0x003e1488 <_pei386_runtime_relocator+24>: add $0x90c00000,%edx 0x003e148e <_pei386_runtime_relocator+30>: add %eax,(%edx) 0x003e1490 <_pei386_runtime_relocator+32>: cmp $0x90c03034,%ecx 0x003e1496 <_pei386_runtime_relocator+38>: jb 0x3e1480 <_pei386_runtime_relocator+16> 0x003e1498 <_pei386_runtime_relocator+40>: pop %ebp 0x003e1499 <_pei386_runtime_relocator+41>: ret End of assembler dump.

That looks like static libgcc to me. So is libgcc calling the wrong malloc for some reason? Why? Is this a relocation problem? Is there any way I can fix this? Is there anyone else I should be asking?

I am using the dwarf2 GCC 4.2.1, but I had the same results with gcc 3.4.5 (though with less details on the crash)

I was thinking that maybe shared libgcc would fix my problem, but I can't seem to link with it. When I specify -shared-libgcc it says I'm missing libgcc_s.a which I can't find anywhere.

Details on my setup:

$ gcc -v Using built-in specs. Target: mingw32 Configured with: ../gcc-4.2.1-2-src/configure --with-gcc --enable-libgomp --host=mingw32 --build=mingw32 --target=mingw32 --program-suffix=-dw2 --with-arch=i486 --with-tune=generic --disable-werror --prefix=/mingw --with-local-prefix=/mingw --enable-threads --disable-nls --enable-languages=c,c ++,fortran,objc,obj-c++,ada --disable-win32-registry --disable-sjlj-exceptions --enable-libstdcxx-debug --enable-cxx-flags=-fno-function-sections -fno-data-sections --enable-version-specific-runtime-libs --disable-bootstrap Thread model: win32 gcc version 4.2.1-dw2 (mingw32-2)

$ld -v GNU ld version 2.17.50 20060824

MINGW runtime is a debug compiled version of mingw-runtime-3.13

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