From owner-freebsd-net@freebsd.org  Wed Jan 11 23:50:26 2017
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Date: Thu, 12 Jan 2017 02:50:20 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Michael Sinatra <michael+lists@burnttofu.net>
Cc: Rick Macklem <rmacklem@uoguelph.ca>,
 "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
Subject: Re: NFSv4 stuck
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On Wed, Jan 11, 2017 at 03:20:22PM -0800, Michael Sinatra wrote:

> On 01/11/17 14:59, Slawa Olhovchenkov wrote:
> > On Wed, Jan 11, 2017 at 10:39:42PM +0000, Rick Macklem wrote:
> >
> >> "umount -f" is your only chance. However, if there is already a non-forced
> >> dismount stuck, it won't work because the non-forced dismount will have
> >> the mounted-on vnode locked.
> >
> > I am use 'intr,soft' flags -- why ignored?
> 
> intr and soft are considered dangerous with nfsv4.  See the "BUGS" 
> section of the mount_nfs(8) man page.

Currently I am see dangerous w/o intr: system need reboot, application
don't killable.