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Re: [Xen-users] DomU stuck in boot

  • To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
  • From: Thomas Graves <tgraves@xxxxxxxxxxxxx>
  • Date: Thu, 17 Jun 2010 07:02:05 -0700
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  • Thread-topic: [Xen-users] DomU stuck in boot

On 6/16/10 9:58 PM, "Fajar A. Nugraha" <fajar@xxxxxxxxx> wrote:

On Thu, Jun 17, 2010 at 4:31 AM, Thomas Graves <tgraves@xxxxxxxxxxxxx> wrote:
> Hello,
> I am running xen-3.3.1 with rhel5.3 dom0.
> I have a rhel5.3 domU that is stuck in the boot process. It seems it is
> trying to bring up the network.  We see this problem only occassionally.

So it's not login console not displayed, only something that happens

Right, I’ve seen it happen 3 times in the past month or so.  It will start to boot and I can see the console up to the the line  ( Bringing up loopback interface:  [  OK  ]) and then the console stops and it never gets to the login prompt and the network isn’t up yet so I can’t get into it.  

> It has been stuck for a few days now. I did a dump-core on it and it seems
> to be doing network start -> ifup-eth ifcfg-eth0 boot -> ip link set dev
> eth0 up -> hypercall.  I'm somewhat assuming it made the hypercall but never
> got the event back but I'm not sure as I'm new to this.   Does anyone have a
> good pointers on how exactly hypercalls work or any info on looking at
> event-channels?  Any ideas why it might be stuck?

I never had this problem, but here's several things you might want to try:
- udate your OS. RHEL 5.5. is out already. At least update your kernel-xen rpm.
- update your Xen version. Xen 3.4.2 (the easy way is from Gitco) has
been quite stable for me. If you want to try latest version, you could
also test Xen 4.0

I actually just upgraded a box to rhel5.4 and xen3.4.2 so I’ll try it there to see if I see it but since it doesn’t happen very often probably won’t know for sure for a while.   

Any pointers on good reads on debugging the events or ring buffers?  Like how to map xenstore info to something useful to look at:
 tx-ring-ref = "768"
 rx-ring-ref = "769"
 event-channel = "14"

Thanks again
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