We get the following error on occasion on our Lustre gateways (Lustre clients exporting filesystems over NFS for non-Lustre clients):

cmcl@foxtrot3 ~ -bash$
Message from syslogd@foxtrot3 at Nov 15 20:20:25 ...
kernel:LustreError: 3501:0:(niobuf.c:330:ptlrpc_register_bulk()) ASSERTION( desc->bd_md_count == 0 ) failed:

Message from syslogd@foxtrot3 at Nov 15 20:20:25 ...
kernel:LustreError: 3501:0:(niobuf.c:330:ptlrpc_register_bulk()) LBUG

Message from syslogd@foxtrot3 at Nov 15 20:20:25 ...
kernel:Kernel panic - not syncing: LBUG
packet_write_wait: Connection to 10.21.22.32 port 22: Broken pipe