[Mono-bugs] [Bug 81685][Wis] Changed - Stack Overflow detection

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Changed by robertj at gmx.net.

http://bugzilla.ximian.com/show_bug.cgi?id=81685

--- shadow/81685	2007-05-21 16:49:11.000000000 -0400
+++ shadow/81685.tmp.21024	2007-05-21 19:34:26.000000000 -0400
@@ -44,6 +44,36 @@
 For trusted execution (our regular code path) I think we would not
 needs this, but we could probably have this optionally enabled for
 when we pass some flag to the runtime (maybe it should be enabled with
 --debug and --security)
 
 
+
+------- Additional Comments From robertj at gmx.net  2007-05-21 19:34 -------
+Besides the gc problem with the altstack, there is another one:
+"finally" code could overflow the altstack, which leads to an
+untrappable SIGSEGV, as like no altstacks were in use.
+
+The sample is first forcing a SIGSEGV, then it's overflowing
+the (pretty small) altstack:
+
+using System;
+
+class T
+{
+        static void Recurse (int i)
+        {
+                if (i % 1000 == 0) Console.Write (".");
+                Recurse (i + 1);
+        }
+
+        static void Main ()
+        {
+                try {
+                        object o = null;
+                        o.Equals (o);
+                } finally {
+                        Recurse (1);
+                }
+        }
+}
+