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Re: port-xen/50659: Xen4.5 crash with vnds
The following reply was made to PR kern/50659; it has been noted by GNATS.
From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: Christoph Badura <bad%bsd.de@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
Subject: Re: port-xen/50659: Xen4.5 crash with vnds
Date: Thu, 24 Mar 2016 22:34:31 +0100
On Thu, Mar 24, 2016 at 10:22:36PM +0100, Christoph Badura wrote:
> On Thu, Mar 24, 2016 at 09:38:06PM +0100, Manuel Bouyer wrote:
> > > If you looks at the linux hotplug scripts, they do their own serialization
> > > as appropriate. "grep -r _lock hotplug/Linux".
> > I tried to do something with shlock(1) but it doens't work, it's too
> > slow and xl times out.
> > Maybe flock would work but older NetBSD don't have it ...
> I noticed that you said before that shlock was too slow. I'm surprised.
> The linux claim_lock functions calls out to perl...
the problem is that shlock can't wait on the lock by itself.
If it fail you have to retry, and in sh I didn't find a way to sleep
for less than 1s before retry (or you could busy-wait but I'm not sure
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
NetBSD: 26 ans d'experience feront toujours la difference
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