File gdb-7.7-bnc891040-1.patch of Package gdb

commit 824344ca4f9765b5598aed2c11b6f3caf5cc77ba
Author: Markus Metzger <markus.t.metzger@intel.com>
Date:   Mon Mar 18 16:43:05 2013 +0100

    frame: do not assume unwinding will succeed
    
    In get_frame_unwind_stop_reason, remove the assumption that further frame
    unwinding will succeed.
    
    gdb/
    2013-02-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
    
    	* frame.c (get_frame_unwind_stop_reason): Unconditionally call
    	get_prev_frame_1.

diff --git a/gdb/frame.c b/gdb/frame.c
index b72d5e4..8cd607b 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -2522,13 +2522,10 @@ get_frame_sp (struct frame_info *this_frame)
 enum unwind_stop_reason
 get_frame_unwind_stop_reason (struct frame_info *frame)
 {
-  /* If we haven't tried to unwind past this point yet, then assume
-     that unwinding would succeed.  */
-  if (frame->prev_p == 0)
-    return UNWIND_NO_REASON;
+  /* Fill-in STOP_REASON.  */
+  get_prev_frame_1 (frame);
+  gdb_assert (frame->prev_p);
 
-  /* Otherwise, we set a reason when we succeeded (or failed) to
-     unwind.  */
   return frame->stop_reason;
 }