ruby-core

> > Sorry, I missed your message about in_jit.  Trying ccan/list now
> > as r65468
> 
> Reverted r65468 for now because all MJIT CIs failed (sorry, was
> tired and needed to go afk for a bit)

Possible fix on top of r65468 (if unreverted) but I'm too tired to
wait for local tests to finish a few times right now...

```
diff --git a/mjit_worker.c b/mjit_worker.c
index 5008e6d8bc..b8ebb29812 100644
--- a/mjit_worker.c
+++ b/mjit_worker.c
@@ -1041,6 +1041,13 @@ convert_unit_to_func(struct rb_mjit_unit *unit, struct rb_call_cache *cc_entries
     in_jit = TRUE;
     CRITICAL_SECTION_FINISH(3, "before mjit_compile to wait GC finish");
 
+    /* We need to check again here because we could've waited on GC above */
+    if (unit->iseq == NULL) {
+        if (!mjit_opts.save_temps)
+            remove_file(c_file);
+        free_unit(unit);
+        return (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
+    }
     {
         VALUE s = rb_iseq_path(unit->iseq);
         const char *label = RSTRING_PTR(unit->iseq->body->location.label);
```

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