Date: Thu, 12 Jan 2017 16:15:04 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Eugene Grosbein <eugen@grosbein.net> Cc: Michael Sinatra <michael+lists@burnttofu.net>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, Rick Macklem <rmacklem@uoguelph.ca> Subject: Re: NFSv4 stuck Message-ID: <20170112131504.GG30374@zxy.spb.ru> In-Reply-To: <58771EA6.1020104@grosbein.net> References: <20170111220818.GD30374@zxy.spb.ru> <YTXPR01MB0189449C0DC06F53E93A3EF9DD660@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM> <20170111225922.GE30374@zxy.spb.ru> <bfe09d16-8fdd-81b1-082b-bdf409d57be4@burnttofu.net> <20170111235020.GF30374@zxy.spb.ru> <58771EA6.1020104@grosbein.net>
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On Thu, Jan 12, 2017 at 01:13:58PM +0700, Eugene Grosbein wrote: > 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. What data? In may case no data. In may case just root idle tcsh. And I am got dangerous for OS: application stuck, nfs don't unmount, any call to nfs function is stuck (lsof, for example) > Just switch back to NFSv3 if you value reliability of your machines more. > NFSv3 processes "intr,soft" just fine. By implementation, not by designg. NFSv4 have some features need for me.
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