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Date: Tue, 09 Jul 2013 11:17:05 +0800 From: Jason Wang <jasowang@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>, David Miller <davem@...emloft.net> Subject: Re: [PATCH 0/2] virtio_net: fix race in RX VQ processing On 07/08/2013 05:05 PM, Michael S. Tsirkin wrote: > Jason Wang reported a race in RX VQ processing: > virtqueue_enable_cb is called outside napi lock, > violating virtio serialization rules. > The race has been there from day 1, but it got especially nasty in 3.0 > when commit a5c262c5fd83ece01bd649fb08416c501d4c59d7 > "virtio_ring: support event idx feature" > added more dependency on vq state. > > Please review, and consider for 3.11 and for stable. > > Jason, could you please report whether this fixes the issues for you? Yes, I confirm this fixes the issue. Since I can only reproduce it by adding udelay in virtqueue_enable_cb() after virtio_mb(). I validate this also with this. Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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