Re: FreeBSD 12.3/13.1 NFS client hang

Hi!

> > I'm having issues with the NFS clients on FreeBSD 12.3 and 13.1

I have it with an 13.0p7 client against an 13.1 server with
a hanging soft-mount (I tried unmount to change it to a hard mount).

61585  93- D+        0:00.00 umount /office/serv
61635 133  D         0:00.00 umount -f /office/serv
 7784 138  D         0:00.00 umount -N /office/serv

and procstat:

# procstat -kk 7784
  PID    TID COMM                TDNAME              KSTACK                       
 7784 107226 umount              -                   mi_switch+0xc1 sleeplk+0xec lockmgr_xlock_hard+0x345 _vn_lock+0x48 vget_finish+0x21 cache_lookup+0x299 vfs_cache_lookup+0x7b lookup+0x68c namei+0x487 kern_unmount+0x164 amd64_syscall+0x10c fast_syscall_common+0xf8 
# procstat -kk 61635
  PID    TID COMM                TDNAME              KSTACK                       
61635 775458 umount              -                   mi_switch+0xc1 sleeplk+0xec lockmgr_slock_hard+0x382 _vn_lock+0x48 vget_finish+0x21 cache_lookup+0x299 vfs_cache_lookup+0x7b lookup+0x68c namei+0x487 sys_statfs+0xc3 amd64_syscall+0x10c fast_syscall_common+0xf8 
# procstat -kk 61585
  PID    TID COMM                TDNAME              KSTACK                       
61585 516164 umount              -                   mi_switch+0xc1 sleeplk+0xec lockmgr_xlock_hard+0x345 nfs_lock+0x2c vop_sigdefer+0x2b _vn_lock+0x48 vflush+0x151 nfs_unmount+0xc3 vfs_unmount_sigdefer+0x2e dounmount+0x437 kern_unmount+0x332 amd64_syscall+0x10c fast_syscall_common+0xf8 

ps-axHl can be found at

https://people.freebsd.org/~pi/logs/ps-axHl.txt

> > systems hanging when using a CentOS 7 server.
> First, make sure you are using hard mounts. "soft" or "intr" mounts won't
> work and will mess up the session sooner or later. (A messed up session could
> result in no free slots on the session and that will wedge threads in
> nfsv4_sequencelookup() as you describe.
> (This is briefly described in the BUGS section of "man mount_nfs".)
> 
> Do a:
> # nfsstat -m
> on the clients and look for "hard".

No output at all for that 8-(

-- 
pi@FreeBSD.org         +49 171 3101372                  Now what ?