non-threaded rts and CollectGarbage

[Moritz Angermann]

Hi there!

in the non-threaded rts we use itimer to do light weight scheduling of
threads via SIGALRM signals.  I'm seeing quite a bit of heap corruption on
aarch64, and it appears that I also see a lot of signal handling in the GC,
for example during evacuate.

Is there a fundamental reason why we can't just disable the timer during GC?

Cheers,
 Moritz
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