[PATCH] NOHZ: Produce debug output instead of a BUG()

The BUG_ON() in tick_nohz_stop_sched_tick() triggers on some boxen.
Remove the BUG_ON and print information about the pending softirq
to allow better debugging of the problem.

Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/time/tick-sched.c

···
 		goto end;
 
 	cpu = smp_processor_id();
-	BUG_ON(local_softirq_pending());
+	if (unlikely(local_softirq_pending()))
+		printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+		       local_softirq_pending());
 
 	now = ktime_get();
 	/*