--- linux-3.14.12/kernel/signal.c.orig	2014-12-02 18:50:24.472593199 -0800
+++ linux-3.14.12/kernel/signal.c	2014-12-02 18:56:35.581041811 -0800
@@ -1340,7 +1340,7 @@
  * send the signal on exit of the trap.
  */
 #ifdef ARCH_RT_DELAYS_SIGNAL_SEND
-	if (in_atomic()) {
+	if (in_atomic() || irqs_disabled()) {
 		if (WARN_ON_ONCE(t != current))
 			return 0;
 		if (WARN_ON_ONCE(t->forced_info.si_signo))
--- linux-3.14.12/arch/arm/kernel/signal.c.orig	2014-12-02 18:30:13.275058413 -0800
+++ linux-3.14.12/arch/arm/kernel/signal.c	2014-12-02 18:33:24.727574197 -0800
@@ -592,6 +593,15 @@
 				}
 				syscall = 0;
 			} else {
+
+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
+				if (unlikely(current->forced_info.si_signo)) {
+					struct task_struct *t = current;
+					force_sig_info(t->forced_info.si_signo,	&t->forced_info, t);
+					t->forced_info.si_signo = 0;
+				}
+#endif
+
 				clear_thread_flag(TIF_NOTIFY_RESUME);
 				tracehook_notify_resume(regs);
 			}
--- linux-3.14.12/arch/arm/include/asm/signal.h.orig	2014-12-02 18:28:12.469745395 -0800
+++ linux-3.14.12/arch/arm/include/asm/signal.h	2014-12-02 18:29:53.760172049 -0800
@@ -1,6 +1,20 @@
 #ifndef _ASMARM_SIGNAL_H
 #define _ASMARM_SIGNAL_H
 
+/*
+ * Because exceptions run with IRQs 
+ * disabled while calling arm_notify_die(), but arm_notify_die() may call
+ * force_sig_info() which will grab the signal spin_locks for the
+ * task, which in PREEMPT_RT_FULL are mutexes.  By defining
+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
+ * trap.
+ */
+#if defined(CONFIG_PREEMPT_RT_FULL)
+#define ARCH_RT_DELAYS_SIGNAL_SEND
+#endif
+
+
 #include <uapi/asm/signal.h>
 
 /* Most things should be clean enough to redefine this at will, if care