fixes a regression from #12055

Author: kripken

tests/test_browser.py

@@ -4912,12 +4912,12 @@ def test_zzz_zzz_4GB_fail(self):
     self.emcc_args += ['-O2', '-s', 'ALLOW_MEMORY_GROWTH', '-s', 'MAXIMUM_MEMORY=4GB', '-s', 'ABORTING_MALLOC=0']
     self.do_run_in_out_file_test('tests', 'browser', 'test_4GB_fail.cpp', js_engines=[V8_ENGINE])
 
+  @unittest.skip("only run this manually, to test for race conditions")
   @requires_threads
   def test_manual_pthread_proxy_hammer(self):
     # the specific symptom of the hang that was fixed is that the test hangs
     # at some point, using 0% CPU. often that occured in 0-200 iterations, but
-    # to make the test fast it runs a lower number. increase "ITERATIONS" when
-    # bisecting.
+    # you may want to adjust "ITERATIONS".
     self.btest(path_from_root('tests', 'pthread', 'test_pthread_proxy_hammer.cpp'),
                expected='0',
                args=['-s', 'USE_PTHREADS=1', '-O2', '-s', 'PROXY_TO_PTHREAD',