Pause an MJIT worker when JIT is cancelled

NEWS.md

@@ -179,6 +179,8 @@ Excluding feature bug fixes.
 * `--jit-verbose` and `--jit-warning` output "JIT cancel" when JIT-ed
   code is disabled because TracePoint or GC.compact is used.
 
+* Pause an MJIT worker when JIT-ed code gets disabled.
+
 * `RubyVM::MJIT` is renamed to `RubyVM::JIT`. [[Feature #17490]]
 
 ## Static analysis

mjit.c

@@ -91,6 +91,9 @@ mjit_cancel_all(const char *reason)
     if (mjit_opts.warnings || mjit_opts.verbose) {
         fprintf(stderr, "JIT cancel: Disabled JIT-ed code because %s\n", reason);
     }
+
+    // Currently we never re-enable JIT calls. Thus we don't need to run JIT anymore.
+    mjit_pause(false);
 }
 
 // Deal with ISeq movement from compactor