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Re: xen 3.4.3 SRPM

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Hi Pasi,

Had a hiccup overnite:

The host became unresponsive in a weird way. The time stopped incrementing.

Turns out the clock stopped ticking (which I put down to the interrupts being 
disconnected).

Anyway I decided I'd reset the time using 'time -s 10:41:30'.

Kaboom, or actually deathly silence. The machine fully stopped dead in its 
tracks.

Just prior to this I connected to the console of one of the 64PV machines 
which was just running a ping from yesterday. Anyway, 60,000 or so lines of 
pings went to the console zipping up the screen. Then it was dead. I did a 
CTRL-C and eventually it returned to the prompt.

So I looked at the other 64PV machine, which was also pining, and identical 
situation.

So I reckon, there's some kind of buffer overflow going on when you're not "xm 
console MACHINE" connected. Once you pass 60,000 lines of text this buffer 
overflow causes the RTC to hangup somehow.

I pressed the reset button, but this time the 2 64PV machines are not logged 
in. I'll just let it go and see if it keeps going.

Cheers
V 

On Tue, 22 Jun 2010 04:29:06 pm Pasi Kärkkäinen wrote:
> On Tue, Jun 22, 2010 at 12:03:53PM +1000, Virgil wrote:
> > Hi Pasi,
> > 
> > On Mon, 21 Jun 2010 08:57:55 pm Pasi Kärkkäinen wrote:
> > > On Mon, Jun 21, 2010 at 01:56:36PM +0300, Pasi Kärkkäinen wrote:
> > > > On Mon, Jun 21, 2010 at 02:28:15PM +1000, Virgil wrote:
> > > > > Another quick update....
> > > > > 
> > > > > xen-4.0.1-0.1.rc3.fc13.src.rpm just compiled this under fc12.
> > > > > 
> > > > > Identical results with this too (i.e. it's probably in the kernel).
> > > > > 
> > > > > I have a (silly) idea for the serial console. The wiki page
> > > > > recommends using a phone camera to capture the screen....
> > > > > 
> > > > > Well my idea is to add an n-millisecond delay every time the output
> > > > > stream in Xen sees a \n. This would delay the screen updates enough
> > > > > for the camera to see them. The n should be configurable on the
> > > > > kernel boot command line. It's set to 0 right now.
> > > > 
> > > > Yeah, we really need to get a log somehow to troubleshoot your
> > > > problem.
> > > > 
> > > > Serial console log would be the best:
> > > > http://wiki.xensource.com/xenwiki/XenSerialConsole
> > > 
> > > Btw are you running the latest kernel:
> > > http://koji.fedoraproject.org/koji/taskinfo?taskID=2254110
> > > 
> > > Or are you running custom/self compiled kernel?
> > 
> > Everything is working with:
> > xen-4.0.1-0.1.rc3 compiled from source on fc12 machine and
> > 2.6.32.14-1.2.107.xendom0.fc12.x86_64 from the  myoung repo.
> > 
> > All fixed.
> 
> Good to hear it works!
> 
> > We also now have a "null modem" cable to another old computer with a COM
> > port. Turns out I was the only old man that could remember what a null
> > modem cable is. The young guy said "wtf"? Also turns out I'm the only
> > one who knows what minicom is and what 8N1 means :-)
> 
> Hehe.. yeah I guess young people don't get to play with serial consoles
> nowadays, until they're doing networking stuff..
> 
> So I guess most SOL devices in servers go unused.. :)
> 
> -- Pasi
> 
> > All VMs are now running concurrently.
> > 
> > Very happy again. Thanks.
> > V
> > 
> > > -- Pasi
> > > 
> > > > > Cheers
> > > > > V
> > > > > 
> > > > > On Mon, 21 Jun 2010 12:10:17 pm Virgil wrote:
> > > > > > Just a quick update:
> > > > > > 
> > > > > > Just tried xen-4.0.0-2. Recompile from source on fc12.x86_64.
> > > > > > 
> > > > > > identical behaviour.
> > > > > > 
> > > > > > Cheers
> > > > > > V
> > > > > > 
> > > > > > On Fri, 18 Jun 2010 03:17:19 pm Virgil wrote:
> > > > > > > On Sat, 29 May 2010 11:26:50 pm M A Young wrote:
> > > > > > > > If anyone wants to test xen 3.4.3, I have put up a source RPM
> > > > > > > > at
> > > > > > > > http://myoung.fedorapeople.org/dom0/src/xen-3.4.3-0.91.fc13.
> > > > > > > > src.r pm
> > > > > > > > 
> > > > > > > >   	Michael Young
> > > > > > > > 
> > > > > > > > --
> > > > > > > > xen mailing list
> > > > > > > > xen@xxxxxxxxxxxxxxxxxxxxxxx
> > > > > > > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > > > > > > 
> > > > > > > Hi list,
> > > > > > > 
> > > > > > > Host crashing on 64FC12 kernel -105 dom0 when 2 PV64 machines
> > > > > > > are run.
> > > > > > > 
> > > > > > > I can run HV32WinXP and HV32FC12 and 1 PV64FC12 all at the same
> > > > > > > time.
> > > > > > > 
> > > > > > > However, when any combination involves 2 PV64FC12 (kernel
> > > > > > > version doesn't matter) the host crashes.
> > > > > > > 
> > > > > > > Running on the -97 dom0 everything works in all combos.
> > > > > > > 
> > > > > > > Using Xen 3.4.3.
> > > > > > > 
> > > > > > > Turning off the virt network cards in the PV64FC12 machines
> > > > > > > makes things go (obviously not much use though).
> > > > > > > 
> > > > > > > Tried disabling IPV6, firewall stuff etc. etc.
> > > > > > > 
> > > > > > > Sometimes it would fire up and go but whichever machine is
> > > > > > > started second gets really long ping times like it's not
> > > > > > > receiving unless it sends something (if that makes sense).
> > > > > > > Sooner or later the host crashes.
> > > > > > > 
> > > > > > > Strangely a PV64FC12 and a PV64FC10 machine coexist happily.
> > > > > > > It's only when a second PV64FC12 machine starts up.
> > > > > > > 
> > > > > > > V
> > > > > > > --
> > > > > > > xen mailing list
> > > > > > > xen@xxxxxxxxxxxxxxxxxxxxxxx
> > > > > > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > > > > > 
> > > > > > --
> > > > > > xen mailing list
> > > > > > xen@xxxxxxxxxxxxxxxxxxxxxxx
> > > > > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > > > > 
> > > > > --
> > > > > xen mailing list
> > > > > xen@xxxxxxxxxxxxxxxxxxxxxxx
> > > > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > > > 
> > > > --
> > > > xen mailing list
> > > > xen@xxxxxxxxxxxxxxxxxxxxxxx
> > > > https://admin.fedoraproject.org/mailman/listinfo/xen
--
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