Re: kern/49810: netbsd-6-1 branch XEN3_DOM0 kernel crashes on boot

[Harry Waddell <waddell%caravaninfotech.com@localhost>]

On Fri, 3 Apr 2015 16:22:10 -0700
Harry Waddell <waddell%caravaninfotech.com@localhost> wrote:

> On Fri,  3 Apr 2015 20:10:07 +0000 (UTC)
> Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> 
> > The following reply was made to PR kern/49810; it has been noted by GNATS.
> > 
> > From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
> > To: gnats-bugs%NetBSD.org@localhost
> > Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost, netbsd-bugs%NetBSD.org@localhost
> > Subject: Re: kern/49810: netbsd-6-1 branch XEN3_DOM0 kernel crashes on boot
> > Date: Fri, 3 Apr 2015 22:09:49 +0200
> > 
> >  On Fri, Apr 03, 2015 at 12:15:00AM +0000, waddell%caravaninfotech.com@localhost wrote:
> >  > >Number:         49810
> >  > >Category:       kern
> >  > >Synopsis:       netbsd-6-1 branch XEN3_DOM0 kernel crashes on boot
> >  > >Confidential:   no
> >  > >Severity:       critical
> >  > >Priority:       medium
> >  > >Responsible:    kern-bug-people
> >  > >State:          open
> >  > >Class:          sw-bug
> >  > >Submitter-Id:   net
> >  > >Arrival-Date:   Fri Apr 03 00:15:00 +0000 2015
> >  > >Originator:     Harry Waddell
> >  > >Release:        netbsd-6-1 ftom ftp://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-6-1/201503310940Z/
> >  > >Organization:
> >  > >Environment:
> >  > NetBSD  6.1.5_PATCH NetBSD 6.1.5_PATCH (GENERIC) amd64
> >  > >Description:
> >  > booting the latest netbsd 6.1 branch XEN DOM0 kernel from the daily builds causes a crash on boot. I have found this problem on a 1 year old supermicro server and using a vmware test system. The GENERIC kernel from the same time period boots without any issues. 
> >  > 
> >  > I have two screen grabs with the crash back trace at
> >  > 
> >  > http://www.extremelymodern.com/netbsd-6-1-branch-xen-crash-on-boot-1.png
> >  > 
> >  > and 
> >  > 
> >  > http://www.extremelymodern.com/netbsd-6-1-branch-xen-crash-on-boot-2.png
> >  > 
> >  > In both cases, xen is xen 4.2 from pkgsrc-2014Q4 branch as of yesterday.
> >  
> >  Do you mean that an older netbsd-6-1 branch kernel used to boot ?
> >  
> >  -- 
> >  Manuel Bouyer <bouyer%antioche.eu.org@localhost>
> >       NetBSD: 26 ans d'experience feront toujours la difference
> >  --
> >  
> 
> 
> Yes. The previous kernel is running now. 
> 
> kern.ostype = NetBSD
> kern.osrelease = 6.1.4_PATCH
> kern.osrevision = 601000400
> kern.version = NetBSD 6.1.4_PATCH (XEN3_DOM0)
> 
> HW
> 
> 


I was able to boot the 201504050400Z kernel. I don't know if my attempt to boot the previous
kernel was a fluke, but unfortunately the system which had the problem is in production 
so I can't do much in the way of testing on it. 

The vmware system crash was something of a red herring. The crash I reported was the result of 
booting DOM0 with all the available memory in the system (4096M), which is not possible since the 
xen kernel uses some memory. I did some testing and with the dom0_max_vcpus=1 given when booting
netbsd, the system crashes when there is not enough memory rather than giving an error 
message about the lack of memory and rebooting. This seems like a bug, but not a terribly critical
one. 

Harry Waddell










dom0_max_vcpus=1