The current context may be changed in `mrb_vm_exec`; ref
MODIFY
src/vm.c
src/vm.c
@@ -973,15 +973,15 @@ mrb_vm_run(mrb_state *mrb, struct RProc *proc, mrb_value self, unsigned int stac
stack_clear(c->stack + stack_keep, nregs - stack_keep);
c->stack[0] = self;
result = mrb_vm_exec(mrb, proc, irep->iseq);
- if (c->ci - c->cibase > cioff) {
- c->ci = c->cibase + cioff;
- }
if (mrb->c != c) {
if (mrb->c->fib) {
mrb_write_barrier(mrb, (struct RBasic*)mrb->c->fib);
}
mrb->c = c;
}
+ else if (c->ci - c->cibase > cioff) {
+ c->ci = c->cibase + cioff;
+ }
return result;
}

The current context may be changed in `mrb_vm_exec`; ref #3668 #4104