[Bug 48482] Star Wars Knights of the Old Republic randomly crashes after failed malloc

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48482

--- Comment #14 from Federico Dossena <info at fdossena.com> ---
(In reply to Stefan Dösinger from comment #13)
> WINEDEBUG=warn+heap doesn't write anything unless it detects corruption. It
> enables some extra code that will fill freed Heap memory with 0xfeeefeee and
> newly allocated ones with 0xfeedfeed (or similar. not sure). It also
> verifies some extra canary values when operating on heap allocations.
> 
> That making it large address aware doesn't help suggests that the heap use
> is not the issue here. Is the virtual memory size still in the 3+ GB range
> at the time of the crash? Heap corruption is pretty unlikely too. warn+heap
> is not guaranteed to catch it, but very likely.
> 
> So next guess would be a race condition. Did you try to force it to one CPU
> core with taskset? (e.g. taskset -c 1 wine kotor.exe)

Yes, I tried running the game with a single core and it doesn't fix it.

Since the game is statically linked, I made a very simple hack that doubles the
requested memory when malloc is called (I can provide a file diff if you want).
The game runs normally but obviously uses a bit more memory, however, it still
crashes after a few load screens, at the same exact point, with an access
violation instead of a null pointer.

So my initial findings might have been wrong (after all, reverse engineering
really isn't my thing), and I think that this might be a use after free thing.
I tried using valgrind to prove this, but it won't start for some reason. Is
there any other way to debug this?

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