Re: CVS commit: src/sys/kern

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Mon, Oct 01, 2018 at 07:04:04AM +0000, Emmanuel Dreyfus wrote:
> On Sun, Sep 30, 2018 at 11:13:11AM +0200, J. Hannken-Illjes wrote:
> > This change is wrong, there is no upper time limit for a successfull
> > file system suspension.
> 
> Indeed, it can be infinite, as I experienced here:
> http://mail-index.netbsd.org/tech-kern/2018/09/21/msg024099.html
> 
> A umount, vndconfig or fssconfig failing with EAGAIN is indeed
> bad,

It's actually quite bad if it happens at shutdown time.

> but I doubt you will advocate that freezing the whole system 
> forever is better.

at the very last, the timeout should be much longer (at last several
seconds) before deciding if it would hang forever. 


> I have machines where the above described 
> scenario became 100% reproductible with the NetBSD 8.0 upgrade, 
> this is just a shame.

Yes, it's a bug, probably related to vndconfig'ing a file on the
same filesystem as /dev. I use vnconfig a lot myself and I've never seen
it.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--