On Tue, 15 Dec 2015 01:35:27 +0000 "Nelson, Shannon" <shannon.nel...@intel.com> wrote:
> Using a slightly modified version of udpspam (see diff below - hopefully > not mangled by corporate email servers), where I set the SO_NO_CHECK > socket option and can specify a large buffer size, I can reliably get > the following WARN trace. I have reproduced this on both ixgbe and > i40e drivers using "udpspam-no-check <target-ip> 6000". > > It looks to me like this is in the Tx path before we get to the actual > NIC drivers, but I may be wrong. > > > [ 1757.644324] ------------[ cut here ]------------ > [ 1757.644333] WARNING: CPU: 22 PID: 5537 at net/core/dev.c:2423 > skb_warn_bad_offload+0x104/0x111() Was anyone able to take a look at this? There is a pretty clear reproducer in the original mail. I know SO_NO_CHECK is a lightly used option, but it does exist and we found a userspace program that tries to use it. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
