Re: Problem with Ubuntu 16.04 PV clients

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Thu, Jun 23, 2016 at 05:04:15PM -0600, Greg Oster wrote:
> On Thu, 23 Jun 2016 12:09:12 -0600
> Greg Oster <oster%netbsd.org@localhost> wrote:
> 
> > On Thu, 23 Jun 2016 16:16:30 +1200
> > Mark Davies <mark%ecs.vuw.ac.nz@localhost> wrote:
> > 
> > > On Tue, 21 Jun 2016 14:07:09 Greg Oster wrote:  
> > > > > I was seeing the same issue... but I've only debugged it to the
> > > > > point
> > > > > 
> > > > > where if change my 'disk' line to:
> > > > >  disk = [ ]
> > > > > 
> > > > > then it gets past that error..... (not to anything useful, of
> > > > > course, because it can't find the installation CD or the
> > > > > disks...)    
> > > > 
> > > > I forgot to mention:
> > > > 
> > > > This is on NetBSD-6.1.4/amd64 with Xen4.1 dom0.    
> > > 
> > > Yes, if I change the disk line to "disk = [ ]" it gets into running
> > > the ubuntu install script but not usefully as you say as there is no
> > > disk. This is NetBSD 7.0_STABLE/amd64 with either Xen4.2 dom0 or 4.5
> > > dom0
> > > 
> > > So how can we debug this further?  
> > 
> > I pulled down a kernel from here:
> > 
> >  http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc4-yakkety/
> > 
> > and while it doesn't crash, it also doesn't see the CDROM (image) or
> > the disk :(  'dmesg' shows the errors:
> > 
> > [    1.230336] xenbus_probe_frontend: Device with no driver:
> > device/vbd/768
> > [    1.230343] xenbus_probe_frontend: Device with no driver:
> > device/vbd/5632
> > [    1.230350] xenbus_probe_frontend: Device with no driver:
> > device/vif/0
> > 
> > which makes me wonder if the initrg.gz I'm using (from the 16.04 iso
> > image) is still missing something...
> 
> I've also tried the kernel and initrd.gz from here, with no further
> luck:
> 
> http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/installer-amd64/current/images/netboot/xen/

with this, the domU crashes just after
"No PS/2 controller found. Probing ports directly"
(XEN) Domain 271 (vcpu#0) crashed on cpu#7:
(XEN) ----[ Xen-4.5.2  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    7
(XEN) RIP:    e033:[<ffffffff8106c037>]
(XEN) RFLAGS: 0000000000010207   EM: 1   CONTEXT: pv guest (d271v0)
(XEN) rax: ffffffff81829db8   rbx: ffffffff8106c037   rcx: ffffffff8126396f
(XEN) rdx: ffffffff8106c037   rsi: ffffffff8182a5e8   rdi: ffffffff81829590
(XEN) rbp: ffff88003e1aa038   rsp: ffff88003e1aa038   r8:  0000000000030001
(XEN) r9:  00000000000000d1   r10: ffffea00001c5500   r11: 00000000000000d1
(XEN) r12: ffff88003e2f8000   r13: 0000000000000000   r14: 000000000000000b
(XEN) r15: ffffffff81829db8   cr0: 000000008005003b   cr4: 00000000000026f4
(XEN) cr3: 000000016bafb000   cr2: ffffffff81829db8
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: e033
(XEN) Guest stack trace from rsp=ffff88003e1aa038:
[...]

I've also seen:
[    0.585176] xen_netfront: Initialising Xen virtual ethernet driver
[    0.587485] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[    0.587517] IP: [<ffffffff813ef6e7>] rb_insert_color+0x17/0x190
[    0.587541] PGD 0
[    0.587552] Oops: 0000 [#1] SMP
[    0.587566] Modules linked in:
[    0.587582] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.4.0-21-generic #37-Ubuntu
[    0.587598] task: ffff88003e2f8000 ti: ffff88003e3àQÿÿsk.ti: fJÿÿe300000
[    0.587612] RIP: e030:[<ffffffff813ef6e7>]  [<ffffffff813ef6e7>] rb_insert_color+0x17/0x190
[    0.587631] RSP: e02@Rÿÿ003e303dLÿÿGS: 00010246
[    0.587640] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
[    0.587651] RDX: ffff8800071d Rÿÿ: ffff88Nÿÿ00 RDI: ffff880007165540
[    0.587662] RBP: ffff88003e303d10 R08: 000000000001a260 R09: ffffffff813eadcc
[    0.587673] R10: Sÿÿ00f6b800Pÿÿ0000000000000b R12: ffff880007165528
[    0.587684] R13: ffff8800071c2bb8 R14: ffff8800071c2bb8 R15: 0000000000000000
[    0.5`SÿÿS:  0000Rÿÿ0000(0000) GS:ffff88003f900000(0000) knlGS:0000000000000000
[    0.587718] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[ÀSÿÿ7728] CRTÿÿ00000000008 CR3: 0000000001e0a000 CR4: 0000000000002660

do you get something else ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--