Index: linux-2.6.18.8/arch/i386/kernel/signal.c
===================================================================
--- linux-2.6.18.8.orig/arch/i386/kernel/signal.c
+++ linux-2.6.18.8/arch/i386/kernel/signal.c
@@ -391,7 +391,7 @@ static int setup_frame(int sig, struct k
 	 * The tracer may want to single-step inside the
 	 * handler too.
 	 */
-	regs->eflags &= ~TF_MASK;
+	regs->eflags &= ~(TF_MASK | X86_EFLAGS_DF);
 	if (test_thread_flag(TIF_SINGLESTEP))
 		ptrace_notify(SIGTRAP);
 
@@ -485,7 +485,7 @@ static int setup_rt_frame(int sig, struc
 	 * The tracer may want to single-step inside the
 	 * handler too.
 	 */
-	regs->eflags &= ~TF_MASK;
+	regs->eflags &= ~(TF_MASK | X86_EFLAGS_DF);
 	if (test_thread_flag(TIF_SINGLESTEP))
 		ptrace_notify(SIGTRAP);
 
Index: linux-2.6.18.8/arch/x86_64/ia32/ia32_signal.c
===================================================================
--- linux-2.6.18.8.orig/arch/x86_64/ia32/ia32_signal.c
+++ linux-2.6.18.8/arch/x86_64/ia32/ia32_signal.c
@@ -493,7 +493,7 @@ int ia32_setup_frame(int sig, struct k_s
 	regs->ss = __USER32_DS; 
 
 	set_fs(USER_DS);
-    regs->eflags &= ~TF_MASK;
+    regs->eflags &= ~(TF_MASK | X86_EFLAGS_DF);
     if (test_thread_flag(TIF_SINGLESTEP))
         ptrace_notify(SIGTRAP);
 
@@ -589,7 +589,7 @@ int ia32_setup_rt_frame(int sig, struct 
 	regs->ss = __USER32_DS; 
 
 	set_fs(USER_DS);
-	regs->eflags &= ~TF_MASK;
+    regs->eflags &= ~(TF_MASK | X86_EFLAGS_DF);
     if (test_thread_flag(TIF_SINGLESTEP))
         ptrace_notify(SIGTRAP);
 
Index: linux-2.6.18.8/arch/x86_64/kernel/signal.c
===================================================================
--- linux-2.6.18.8.orig/arch/x86_64/kernel/signal.c
+++ linux-2.6.18.8/arch/x86_64/kernel/signal.c
@@ -302,7 +302,7 @@ static int setup_rt_frame(int sig, struc
 	   see include/asm-x86_64/uaccess.h for details. */
 	set_fs(USER_DS);
 
-	regs->eflags &= ~TF_MASK;
+	regs->eflags &= ~(TF_MASK | X86_EFLAGS_DF);
 	if (test_thread_flag(TIF_SINGLESTEP))
 		ptrace_notify(SIGTRAP);
 #ifdef DEBUG_SIG