Hi, all Sorry to bother you. lock_mtab in xfstests/src/t_mtab.c waits only for LOCK_TIMEOUT, which is 10. After that it emits an error message. However when NFSv4 client fails to lock a file in nfs4_retry_setlk (eg. locking conflict), it backs off for 30s before retrying. So generic/089 frequently fails for NFSv4. I'm wondering if there's a workaround to this problem. My kernel version is 4.19.24 Thanks, Yihao Wu
