--- arch/arm/kernel/smp.c

+++ arch/arm/kernel/smp.c

@@ -672,7 +672,9 @@ void handle_IPI(int ipinr, struct pt_reg

break;

case IPI_CPU_BACKTRACE:

+ irq_enter();

ipi_cpu_backtrace(cpu, regs);

+ irq_exit();

break;

default: