Stop backtrace when we make no more progress.

2 files changed, 13 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 0d0120c..9e78199 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-07-30  Ulrich Drepper  <drepper@redhat.com>
+
+	* sysdeps/ia64/backtrace.c (backtrace_helper): Stop backtrace when
+	we make no more progress.
+
 2009-07-29  Ulrich Drepper  <drepper@redhat.com>
 
 	* math/s_fma.c: Don't define alias if __fma is a macro.
diff --git a/sysdeps/ia64/backtrace.c b/sysdeps/ia64/backtrace.c
index 423fed8..5cefb86 100644
--- a/sysdeps/ia64/backtrace.c
+++ b/sysdeps/ia64/backtrace.c
@@ -1,5 +1,5 @@
 /* Return backtrace of current program state.
-   Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
 
@@ -61,7 +61,13 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
   /* We are first called with address in the __backtrace function.
      Skip it.  */
   if (arg->cnt != -1)
-    arg->array[arg->cnt] = (void *) unwind_getip (ctx);
+    {
+      arg->array[arg->cnt] = (void *) unwind_getip (ctx);
+
+      /* Check whether we make any progress.  */
+      if (arg->cnt > 0 && arg->array[arg->cnt - 1] == arg->array[arg->cnt])
+	return _URC_END_OF_STACK;
+    }
   if (++arg->cnt == arg->size)
     return _URC_END_OF_STACK;
   return _URC_NO_REASON;