Re: [Xen-users] pv_ops domU crashes on pv_ops dom0 (directly at boot)

[Markus Schuster <ml@xxxxxxxxxxxxxxxxxxxx>]

On Tuesday 19 January 2010 12:46:37 Pasi Kärkkäinen wrote:
> On Tue, Jan 19, 2010 at 12:38:47PM +0100, Markus Schuster wrote:
> > On Tuesday 19 January 2010 12:17:33 Pasi Kärkkäinen wrote:
> > > What's the hypervisor version btw?
> >
> > That's 3.4.2 (from Debian sid)
> >
> > > When the guest is crashed, run in dom0:
> > >
> > > /usr/lib/xen/bin/xenctx -s System.map-domUkernelversion <domid>
> >
> > Here we go:
> > rip: ffffffff8100930a _stext+0x30a
> > flags: 00001246 i z p
> > rsp: ffff880002c33e60
> > rax: 0000000000000000   rcx: ffffffff8100930a   rdx: 0000000000000000
> > rbx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000000002
> > rbp: ffff880002c5d1d0    r8: ffff880002c3c590    r9: ffff880002c33e90
> > r10: 00025c9e9c681d15   r11: 0000000000000246   r12: ffff880002c33e88
> > r13: 0000000000000004   r14: 0000000000000000   r15: 0000000000000000
> >  cs: e033        ss: e02b        ds: 0000        es: 0000
> >  fs: 0000 @ 0000000000000000
> >  gs: 0000 @ ffff880002c30000/0000000000000000
> > Code (instr addr ffffffff8100930a)
> > cc cc cc cc cc cc cc cc cc cc cc 51 41 53 b8 18 00 00 00 0f 05 <41> 5b 59
> > c3 cc cc cc cc cc cc cc
> >
> >
> > Stack:
> >  ffffffff811e49da 0000000000000080 ffffffff8100e656 0000000000000001
> >  ffffffff8107498b ffff880002c33e88 ffff880002c33e88 ffffffff8142d740
> >  ffff880017c14180 0000000000000004 ffffffff8100e834 0000000067559fe6
> >  ffffffff810937c8 ffff880002c45f00 ffffffff8142d740 ffffffff8142d7ac
> >
> > Call Trace:
> >   [<ffffffff8100930a>] _stext+0x30a  <--
> >   [<ffffffff811e49da>] set_affinity_irq+0x5a
> >   [<ffffffff8100e656>] stop_self+0x2e
> >   [<ffffffff8107498b>] generic_smp_call_function_single_interrupt+0xc0
> >   [<ffffffff8100e834>] xen_call_function_single_interrupt+0xe
> >   [<ffffffff810937c8>] handle_IRQ_event+0x58
> >   [<ffffffff81095150>] handle_level_irq+0x6a
> >   [<ffffffff81013917>] handle_irq+0x17
> >   [<ffffffff811e454c>] xen_evtchn_do_upcall+0x102
> >   [<ffffffff81011cbe>] xen_do_hypervisor_callback+0x1e
> 
> Ok, thanks. Also please do:
> 
> gdb vmlinux
> 
> x/i 0xffffffff8100930a
> list *0xffffffff8100930a
> disas 0xffffffff8100930a
> 
> Those should be useful to debug this.

OK, that's not so easy as I'm using binary kernel packages from Debian so I 
only have vmlinuz images laying around (and gdb is not happy about them). 
I have to recompile Debians kernel to have a vmlinux file (not a big problem - 
costs a bit of time, that's all).
Should I activate CONFIG_DEBUG_INFO btw?

You may remember, Jeremy was interested in similar information (but he 
extracted the memory address (??) to pass to gdb from the kernels crash dump) 
- I will forward you my old e-mail off-list, maybe it's interesting :) 

Regards,
Markus

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