Date: Fri, 31 May 2024 15:39:01 -0400 From: J David <j.david.lists@gmail.com> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: NFSv4 hangs on 13.3 Message-ID: <CABXB=RTH6s25EMQzDbg8WPr1hKtjKOJGVh3no0TFcNC=ufwXCw@mail.gmail.com>
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In an attempt to narrow down the problems we have with NFS v4.2, we've set up a FreeBSD 13.3 server that mirrors some read-only data from our Linux NFS servers. We are still observing occasional hangs on the FreeBSD 13.3 client machines. When these hangs occur, anything that touches the mountpoint (including "umount -N") hangs indefinitely. There is nothing in dmesg. The only even slightly informative data I could gather is an "ls /mount/point" kstack: $ sudo procstat -kk 94676 PID TID COMM TDNAME KSTACK 94676 976876 ls - mi_switch+0xbf sleeplk+0xea lockmgr_slock_hard+0x3a5 nfs_lock+0x29 vop_sigdefer+0x2a _vn_lock+0x47 vfs_cache_root+0x9d vfs_root_sigdefer+0x35 lookup+0x88a namei+0x24a kern_statat+0xf8 sys_fstatat+0x27 amd64_syscall+0x110 fast_syscall_common+0xf8 During this time, the NFS server continues serving other clients, and the affected client can access other NFS servers without hanging. The "nfsstat -m" for this mountpoint looks like this: nfsv4,minorversion=2,oneopenown,tcp,resvport,nconnect=1,hard,cto,nolockd,sec=sys,acdirmin=3,acdirmax=60,acregmin=5,acregmax=60,nametimeo=60,negnametimeo=60,rsize=65536,wsize=65536,readdirsize=65536,readahead=1,wcommitsize=16777216,timeout=120,retrans=2147483647 with these mount flags in /etc/fstab: ro,nfsv4,minorversion=2,tcp,nosuid,noatime,nolockd,oneopenown Is there anything more we can do to help identify this issue? Thanks for any advice!home | help
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