Keep vm->orig_progname alive

`vm->orig_progname` can be different from `vm->progname` when user
code assigns to `$0`. While `vm->progname` is kept alive by the
global table, nothing marked `vm->orig_progname`.

[Bug #15887]

1 files changed, 1 insertions, 0 deletions

diff --git a/vm.c b/vm.c
index 1bc1ed757f..9dd97e77c7 100644
--- a/vm.c
+++ b/vm.c
@@ -2248,6 +2248,7 @@ rb_vm_mark(void *ptr)
 	rb_gc_mark(vm->loaded_features);
 	rb_gc_mark(vm->loaded_features_snapshot);
 	rb_gc_mark(vm->top_self);
+        rb_gc_mark(vm->orig_progname);
 	RUBY_MARK_UNLESS_NULL(vm->coverages);
         /* Prevent classes from moving */
         rb_mark_tbl(vm->defined_module_hash);