I've been running for quite a while two Debian9 machines with 4.9 kernel, with DRBD syncing data between them. The link is directly connected Intel X540-AT2, with default settings except for MTU bumped to 9710; driver is ixgbe V4.4.0-k.
After upgrading to Kernel 4.13 (which includes ixgbe Version 5.1.0-k), I get some dozen kernel logs from DRBD (which is the same version on 4.9 and 4.13) stating that invalid header magics were received. tcpdump shows out-of-line data.
Testing with 4.14.7, I get the same problem. Switching MTU back to 1500 fixes the problem, so does disabling scatter-gather (which includes tso; disabling tso alone doesn't help)
Apparently, disabling scatter-gather does NOT fix the problem, seeing the same again.
large-receive-offload is off (default value), disabling gso and gro doesn't help either. So apparently only cutting mtu down to default 1500 helps.