On Sun, 2013-06-30 at 08:26 +0800, Joe Jin wrote: > So far we suspected it caused by iscsi called sendpage(), and later page > be unmapped but still trying copy skb. We'll try to disable sg to see if > help or no.
sendpage() should increment page refcounts for every page frag of an skb, therefore page should not be unmapped. Of course userland can either rewrite the content, or unmap() the page, but the underlying page cannot be freed as long skb is not freed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
