Issue #15229: An OSError subclass whose __init__ doesn't call back
OSError.__init__ could produce incomplete instances, leading to crashes
when calling str() on them.
diff --git a/Misc/NEWS b/Misc/NEWS
index bca959b..44a3d14 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #15229: An OSError subclass whose __init__ doesn't call back
+  OSError.__init__ could produce incomplete instances, leading to crashes
+  when calling str() on them.
 
 Library
 -------