(Merge 3.1) Issue #11768: The signal handler of the signal module only calls
Py_AddPendingCall() for the first signal to fix a deadlock on reentrant or
parallel calls. PyErr_SetInterrupt() writes also into the wake up file.
diff --git a/Misc/NEWS b/Misc/NEWS
index 7381397..ad532ab 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -55,6 +55,10 @@
 Library
 -------
 
+- Issue #11768: The signal handler of the signal module only calls
+  Py_AddPendingCall() for the first signal to fix a deadlock on reentrant or
+  parallel calls. PyErr_SetInterrupt() writes also into the wake up file.
+
 - Issue #11442: Add a charset parameter to the Content-type in SimpleHTTPServer
   to avoid XSS attacks.