The sre test suite currently overruns the stack on Win64, Linux64, and Monterey
(64-bit AIX) This is because the RECURSION_LIMIT is too low. This patch lowers
to recusion limit to 7500 such that the recusion check fires before a segfault.
Fredrik suggested/approved the fix in private email, modulo sre's recusion
limit checking no being necessary when PyOS_CheckStack is implemented for
Windows.
diff --git a/Modules/_sre.c b/Modules/_sre.c
index b87282c..29e92ac 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -58,9 +58,18 @@
/* -------------------------------------------------------------------- */
/* optional features */
-/* prevent run-away recursion (bad patterns on long strings) */
+/* prevent run-away recursion (bad patterns on long strings)
+ Require a smaller recursion limit for a number of 64-bit platforms
+ to prevent stack overflow:
+ Win64 - MS_WIN64, Linux64 - __LP64__, Monterey (64-bit AIX) - _LP64
+ XXX Or maybe this should be defined for all SIZEOF_VOIDP>4 platforms?
+*/
#if !defined(USE_STACKCHECK)
-#define USE_RECURSION_LIMIT 10000
+# if defined(MS_WIN64) || defined(__LP64__) || defined(_LP64)
+# define USE_RECURSION_LIMIT 7500
+# else
+# define USE_RECURSION_LIMIT 10000
+# endif
#endif
/* enables fast searching */