From be7a91709b90825990e571b2f20cea937d5eef6c Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Tue, 26 Sep 2006 10:52:34 +0200
Subject: [PATCH] Check for end of stack trace before falling back

Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 4ac18b0..28e5334 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -292,6 +292,8 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
 				if ((long)UNW_SP(&info) < 0) {
 					ops->warning(data, "Leftover inexact backtrace:\n");
 					stack = (unsigned long *)UNW_SP(&info);
+					if (!stack)
+						return;
 				} else
 					ops->warning(data, "Full inexact backtrace again:\n");
 			} else if (call_trace >= 1)
-- 
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