Hi Bruce, I've also find different failures on NFS 4.0: SEC7 st_secinfo.testRPCSEC_GSS : FAILURE SECINFO returned mechanism list without RPCSEC_GSS LOCK24 st_lock.testOpenUpgradeLock : FAILURE OP_LOCK should return NFS4_OK, instead got NFS4ERR_BAD_SEQID They're on stable kernel 5.12.3-1-default (openSUSE). I saw them also on older kernel 4.19.0-16-amd64 (Debian). Any idea how to find whether are these are wrong setup or test bugs or real kernel bugs? Upstreaming your scripts or better documenting the setup would be great. Kind regards, Petr