diff --git a/Lib/test/test_faulthandler.py b/Lib/test/test_faulthandler.py
index 75d303cd212c82..bcebaef0a5101a 100644
--- a/Lib/test/test_faulthandler.py
+++ b/Lib/test/test_faulthandler.py
@@ -795,6 +795,7 @@ def test_register_fd(self):
     def test_register_threads(self):
         self.check_register(all_threads=True)
 
+    @support.skip_if_sanitizer("gh-129825: hangs under TSAN", thread=True)
     def test_register_chain(self):
         self.check_register(chain=True)