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Previously, live range of `ast_value` ended on the call right before rb_ast_dispose(), which led to premature collection and use-after-free. We observed this crashing on -O3, -DVM_CHECK_MODE, with GCC 11.4.0 on Ubuntu. Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org>
Previously, vm_make_env_each() (used during proc creation and for the debug inspector C API) picked up the non-GC-allocated iseq that rb_vm_push_frame_fname() creates, which led to a SEGV when the GC tried to mark the non GC object. Put a real iseq imemo instead. Speed should be about the same since the old code also did a imemo allocation and a malloc allocation. Real iseq allows ironing out the special-casing of dummy frames in rb_execution_context_mark() and rb_execution_context_update(). A check is added to RubyVM::ISeq#eval, though, to stop attempts to run dummy iseqs. [Bug #21180] Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org>
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