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It also fails on multithdreaded programs, unless you add even more assumptions on the allocator.

"Multidreaded programs" :-)

This was at least a decade before multithreading in C and Unix. But yes this "technique" would have failed miserably in a multithreaded environment.

I mean, it wouldn't even work with interrupts, technically (though an interrupt that plays "nice" shouldn't allocate).