Re: [Xen-devel] trace in dmesg

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

On Wed, Jun 29, 2011 at 10:49:58AM -0700, Mike Wright wrote:
> Hi all,
> 
> I'm (finally, yeah!!!) running xen-4.1.1 with linux-3.0.0-rc5 in
> runlevel 5 and so far seems indistinguishable from bare metal.

Woot!
> 
> However, this is in dmesg, and I wonder if it is important.
> 
> [    0.014109] ------------[ cut here ]------------
> [    0.014144] WARNING: at arch/x86/xen/enlighten.c:714
> xen_apic_write+0x1a/0x1c()
> [    0.014149] Hardware name: GA-890GPA-UD3H
> [    0.014152] Modules linked in:
> [    0.014158] Pid: 1, comm: swapper Not tainted 3.0.0-rc4 #1
> [    0.014163] Call Trace:
> [    0.014170]  [<ffffffff8104ce8e>] warn_slowpath_common+0x85/0x9d
> [    0.014177]  [<ffffffff8104cec0>] warn_slowpath_null+0x1a/0x1c
> [    0.014182]  [<ffffffff81003450>] xen_apic_write+0x1a/0x1c
> [    0.014188]  [<ffffffff81018caa>] apic_write.clone.15+0x1b/0x1d
> [    0.014193]  [<ffffffff81019567>] perf_events_lapic_init+0x1c/0x1e
> [    0.014200]  [<ffffffff81b6311f>] init_hw_perf_events+0xd86/0xeff
> [    0.014206]  [<ffffffff8104e984>] ? set_cpu_present+0x1a/0x2a
> [    0.014211]  [<ffffffff81b62399>] ? check_bugs+0x2d/0x2d
> [    0.014217]  [<ffffffff81002190>] do_one_initcall+0x7f/0x137
> [    0.014223]  [<ffffffff81b59c3e>] kernel_init+0x93/0x157
> [    0.014229]  [<ffffffff81048230>] ? schedule_tail+0x31/0x65
> [    0.014235]  [<ffffffff81485b64>] kernel_thread_helper+0x4/0x10
> [    0.014241]  [<ffffffff81484c63>] ? int_ret_from_sys_call+0x7/0x1b
> [    0.014248]  [<ffffffff8147e721>] ? retint_restore_args+0x5/0x6
> [    0.014253]  [<ffffffff81485b60>] ? gs_change+0x13/0x13
> [    0.014261] ---[ end trace a7919e7f17c0a725 ]---

It is and it is not :-) Its telling us that performance counters can't be
enabled. Which we do know about but haven't yet investigated in how
to make them work properly.

Thanks for reporting this! What is the graphic card you are using?
> 
> Thanks for your attention,
> Mike Wright
> 
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> http://lists.xensource.com/xen-devel

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