NFSv4 stuck

[Eugene Grosbein]

12.01.2017 6:50, Slawa Olhovchenkov пишет:
> 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.

NFSv4 confiders "intr,soft" dangerous for data generated by poorly written applications, not for a OS.
Just switch back to NFSv3 if you value reliability of your machines more.
NFSv3 processes "intr,soft" just fine.