lots of messages like this:

LustreError: 6817:0:(pack_generic.c:425:lustre_msg_buf_v2()) msg 000000005c83b7a2 buffer[0] size 152 too small (required 184, opc=-1)

the issue was introduced with
commit 9ae40e4c5ecbc754e47b0570fedddc6963e03f9a
Author: Ann Koehler <amk@cray.com>
Date: Mon Jul 8 15:17:07 2019 -0500

LU-12523 ptlrpc: Add jobid to rpctrace debug messages

the root cause is that jobid is optional and some RPCs (LDLM callbacks) still use V2 ptlrpc with no space for jobid. probably it makes sense to revert the patch.