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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: Christoph Badura <bad%bsd.de@localhost>
To: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost,
Subject: Re: port-xen/50659: Xen4.5 crash with vnds
Date: Thu, 24 Mar 2016 18:53:20 +0100
On Wed, Mar 23, 2016 at 09:23:22AM +0100, Manuel Bouyer wrote:
> I think it is Xen's problem.
> I noticed that xen 4.5 starts domUs concurently (/etc/rc.d/xendomains start)
> which prevented be from upgrading to 4.5 because of concurency problems
> in my network scripts (local change).
> Now if it runs scripts for each block device (or, I guess, each
> network device) in parallel, then we have a problem.
xl does indeed run the device hotplug scripts in parallel. c.f.
If you looks at the linux hotplug scripts, they do their own serialization
as appropriate. "grep -r _lock hotplug/Linux".
This is clearly a problem with the NetBSD hotplug scripts. C.f. pkg/51008.
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