On Fri, Mar 22, 2024 at 12:11:44PM +0100, Roland Mainz wrote: > Hi! > > ---- > > After updating my Debian 11 and RHEL 9 installations with Linux kernel > 6.6.20-rt25 I start getting the following error messages > "svc_tcp_read_marker nfsd RPC fragment too large". > Client side is Linux NFSv4.2 client (Debian&&RHEL, both default kernel > and Linux 6.6.20-rt25)+ms-nfs41-client HEAD. > > Is this a know issue, and is there a patch for it ? The "fragment too large" message means the incoming RPC frame has the high-order bit set in its TCP record marker. It could mean: 1. The client is trying to send an RPC message that is split over multiple RPC fragments. The Linux in-kernel RPC server does not support that. 2. The TCP byte stream has gotten out of sync with the RPC framing. That's a sign of a bug or misconfiguration somewhere, though not necessarily on the NFS server. Wireshark can help you sort it out. -- Chuck Lever
