> recv01 3 FAIL : invalid recv buffer ; returned 0 (expected -1), Ok. I see the problem in the source. When the packet hits the user context TCP path (= netstat -s | grep TCPHPHitsToUser increases by one) the EFAULT is not currently passed up. It is not that hard to fix. -Andi - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html