Re: [Xen-devel] domU crashing, trying to determine why

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Jan 14, 2011 at 12:31:22PM -0500, micah anderson wrote:
> On Mon, 3 Jan 2011 12:14:25 -0500, Konrad Rzeszutek Wilk 
> <konrad.wilk@xxxxxxxxxx> wrote:
> > On Mon, Jan 03, 2011 at 12:03:34PM -0500, micah anderson wrote:
> > > On Mon, 3 Jan 2011 11:40:31 -0500, Konrad Rzeszutek Wilk 
> > > <konrad.wilk@xxxxxxxxxx> wrote:
> > > > > > I've got this setup:
> > > > > > 
> > > > > > vcpus=2
> > > > > > cpus=[1,3]
> > > > 
> > > > Is there anything in the Xen hypervisor ring buffer? You might need to 
> > > > enable the 
> > > > full logging of the guest and dom0 to get anything there.
> > > 
> > > How do I get at the ring buffer, and what specifically should I enable
> > 
> > 'xm dmesg'
> 
> (XEN) mm.c:645:d2 Non-privileged (2) attempt to map I/O space 000000f0

Hmm, that should not happen anymore, as there are is a bunch of
code guarding domains from trying to touch 0->0x100. Unless your guest
has the old stuff.

> (XEN) traps.c:2544: GPF (0068): ff1886c2 -> ff1887c9
> (XEN) domain_crash_sync called from entry.S (ff188600)
> (XEN) Domain 2 (vcpu#1) crashed on cpu#3:
> (XEN) ----[ Xen-3.2-1  x86_32p  debug=n  Tainted:    C ]----

Ugh, ancient hypervisor.

> (XEN) CPU:    3
> (XEN) EIP:    0061:[<c01013a7>]

Now use gdb to lookup that EIP value. Or use your guest System.map
to see what function this could map too.

> (XEN) EFLAGS: 00000246   CONTEXT: guest
> (XEN) eax: 00000000   ebx: 00000001   ecx: 00000000   edx: ed447f90
> (XEN) esi: 00000001   edi: 00000001   ebp: 00000000   esp: ed447f84
> (XEN) cr0: 8005003b   cr4: 000006f0   cr3: 00bdac80   cr2: 095346dc
> (XEN) ds: 007b   es: 007b   fs: 00d8   gs: 0000   ss: 0069   cs: 0061
> (XEN) Guest stack trace from esp=ed447f84:
> (XEN)    c0105f52 ffffffff 00000001 673bfa5d 0002dba1 00000000 00000000 
> ffffffff
> (XEN)    c01028ab c0102810 00000000 00000000 00000000 00000000 00000000 
> 00000000

And potentially c01028ab  c0105f52 .. 
> (XEN)    00000000 00000000 00000000 00000000 00000000 00000000 000000d8 
> 00000000
> (XEN)    00000000 00000000 00000000 00000000 00000000 00000000 00000000
> 



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