Fix segfault in mark_locations_array #10
Merged
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This commit fixes a segfault in mark_locations_array.
This segfault was a result of treating one of the pthread's stacks as the stack of the thread starting garbage collection. When mark_current_machine_context saves the current machine state into a jump buffer, it was using the wrong stack, causing mark_locations_array to be called with weird arguments which eventually led to a segfault.
Perhaps predictably, shit still does not work, but garbage collection will now complete a single pass on gc-test/simple.rb.