Crash confuses me

[Marcus Meissner]

On Thu, Mar 07, 2013 at 07:53:57PM +0000, Graham wrote:
> I use a LD_PRELOAD before running wine so that i can debug my application.
> 
> The library which is preloaded is able to replace system dlsym and from
> that, other consequence library call.
> 
> There is no problem until, i put some Detour code(hot patching) into the
> kernel32.dll.so address space.  But the very funny things is this
> **    THE PROGRAM CRASHES BEFORE MY HOTPATCH IS APPLIED **
> 
> so it seems somehow  the order of cause and effect is extremely weird
> and frightening to me. How can a piece of code which is not excecuted be
> teh cause for errors PRIOR/BEFORE to its execution.  And this is surely
> happening because when i uncomment the Hotpatch/detour lines the problem
> goes away.
> 
> here are some lines from the crashs ...
> 
> err:module:attach_process_dlls "user32.dll" failed to initialize, aborting
> err:module:LdrInitializeThunk Main exe initialization for
> L"C:\\windows\\system32\\winemenubuilder.exe" failed, status c0000005
> wine: Unhandled page fault on execute access to 0x7c9e4cd7 at address
> 0x7c9e4cd7 (thread 000b), starting debugger...
> err:module:DelayLoadFailureHook failed to delay load
> user32.dll.BroadcastSystemMessageW
> wine: Call from 0x7b83ba92 to unimplemented function
> user32.dll.BroadcastSystemMessageW, aborting
> wine: Unimplemented function user32.dll.BroadcastSystemMessageW called
> at address 0x7b83ba92 (thread 001d), starting debugger...
> 
> Another thing to notice is that this was tested using wine1.4.1
> 
> However it DOES work with wine1.5.10 ... to get something to work for me
> is not the challenge, its to understand the logic behind why something
> does not.
> 
> THanks a lot and I am grateful for any who contributes his knowledge to
> this problem i am a real NOVICE

"real NOVICE" and using LD_PRELOAD or "hotpatching" does not fit together for me...?

- wine uses it own elfloader, which might cause issues.

- during loading/linking it might also interact already.

what should the LD_PRELOAD thing achieve? Can perhaps a wine internal debug mechanism
be used already?

Ciao, Marcus