Issue #14173: Avoid crashing when reading a signal handler during interpreter shutdown.

diff --cc Misc/NEWS
index 64b1efcf6ad2676d8d36b6e4f502362fbc4cfbef,da68f262c2de818e501802fa3cb34a5e43300f2d..ab268c80bc1d5b86e8913a3d390a53a2d496b302
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -69,6 -47,11 +69,9 @@@ Core and Builtin
  Library
  -------
  
 -- Issue #16316: mimetypes now recognizes the .xz and .txz (.tar.xz) extensions.
 -
+ - Issue #14173: Avoid crashing when reading a signal handler during
+   interpreter shutdown.
+ 
  - Issue #15902: Fix imp.load_module() accepting None as a file when loading an
    extension module.
  

diff --cc Modules/signalmodule.c
Simple merge