This is unlikely to be the problem, but it is a fun story:

Many years ago there was a bug in the KVM kernel code that failed to
correctly context switch all the registers in virtual machines.
In this case, the somewhat obscure debug registers. So if I was
running debugger tests inside a virtual machine, and the test was
using a address trap (where the debug registers can be set to
generate an interrupt when you reference a specific memory location),
then sometimes programs running on the host machine would get the
address trap if they referenced that memory address :-). After much
head scratching I managed to produce a test case that could trigger
the bug nearly instantly and reported the bug, which was actually
fixed.

I suppose the virtual box kernel code might have introduced such
a bug, but that's probably unlikely.
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