It turns out the scribbling is almost it! The crash is not the scribbling itself, but the "char buf[JACK_THREAD_STACK_TOUCH];". This is usually something huge. If you make it smaller, the crash goes away - for me, the critical value is 14528 (OK), 14529 (crashes). It seems that the end of buf is getting close to 0xC0000000 when the size of buf is 14528, and maybe something starts to go over.
Now, I don't know anything about memory issues, so why is 0xC0000000 so important?
That is very interesting! It might be worth posting a bit of history and this info to wine-devel, and see if someone has an idea. It would be necessary to describe the relationships between libjack/fst/jack_fst/Wine (it is a bit complicated ;)
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