--- kstack/arch/i386/kernel/irq.c.~1~	Tue Jan 22 18:55:15 2002
+++ kstack/arch/i386/kernel/irq.c	Mon Jul 29 23:36:21 2002
@@ -577,7 +577,16 @@ asmlinkage unsigned int do_IRQ(struct pt
 	irq_desc_t *desc = irq_desc + irq;
 	struct irqaction * action;
 	unsigned int status;
+	long esp;
 
+	/* Debugging check for stack overflow: is there less than 1KB free? */
+	__asm__ __volatile__("andl %%esp,%0" : "=r" (esp) : "0" (8191));
+	if (unlikely(esp < (sizeof(struct task_struct) + 1024))) {
+		printk("Detected potential for stack overflows, stack left: %ld bytes\n",
+			esp - sizeof(struct task_struct));
+		show_stack(NULL);
+	}
+	
 	kstat.irqs[cpu][irq]++;
 	spin_lock(&desc->lock);
 	desc->handler->ack(irq);