I seem to have run into a heisenbug involving destructors and the
GC. I'm kind of stuck at this point and need help tracking down
the issue.
I put the broken code in a branch called heisenbug on github:
https://github.com/higgsjs/Higgs/tree/heisenbug
The problem manifests itself on runs of `make test` (my
unittests), but only some of the time. I wrote a script to run
`make test` repeatedly to try and find a solution:
https://github.com/higgsjs/Higgs/blob/heisenbug/source/repeatmaketest.py
The problem usually manifests itself after 5 to 15 runs on my
machine. I get a segmentation fault, not always in the same
place. The randomness seems to stem from address space
randomization.
It seems the issue is caused by my freeing/reinitializing the VM
during unit tests. More specifically, commenting out this line
makes the problem go away:
https://github.com/higgsjs/Higgs/blob/heisenbug/source/runtime/vm.d#L741
Higgs can run all of my benchmarks without ever failing, but
restarting the VM during `make test` seems to be causing this
problem to happen. It's not impossible that there could be
another underlying issue, such as the JITted code I generate
corrupting some memory location, but it would seem that if this
were the case, the issue would likely show up outside of unit
tests. Any help would be appreciated.
