On Thu, 2015-03-19 at 14:50 -0700, Eric Dumazet wrote:

quoted

Are you seeing this race on x86 ?

If IPI are not reliable on your arch, I am guessing you should fix them.

Otherwise, even without hotplug you'll have hangs.

Please try instead this patch :

diff --git a/net/core/dev.c b/net/core/dev.c

index
5d43e010ef870a6ab92895297fe18d6e6a03593a..baa4bff9a6fbe0d77d7921865c038060cb5efffd
100644

--- a/net/core/dev.c
+++ b/net/core/dev.c

@@ -4320,9 +4320,8 @@ static void net_rps_action_and_irq_enable(struct

softnet_data *sd)
 		while (remsd) {
 			struct softnet_data *next = remsd->rps_ipi_next;

-			if (cpu_online(remsd->cpu))
-				smp_call_function_single_async(remsd->cpu,
-							   &remsd->csd);
+			smp_call_function_single_async(remsd->cpu,
+						       &remsd->csd);
 			remsd = next;
 		}
 	} else


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