From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Subject: trace in arch/x86/kernel/apic/apic.c:1309 setup_local_APIC
Date: Mon, 25 Jan 2016 14:51:31 +0100
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Hi,

while running qemu 2.4 on whestmere CPUs i'm pretty often getting this
one while booting:
[    0.811645] Switched APIC routing to physical x2apic.
[    1.835678] ------------[ cut here ]------------
[    1.835704] WARNING: CPU: 0 PID: 1 at
arch/x86/kernel/apic/apic.c:1309 setup_local_APIC+0x284/0x340()
[    1.835714] Modules linked in:
[    1.835724] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.1.15+72-ph #1
[    1.835731] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014
[    1.835743]  ffffffffb69ffcea ffff88042d5e3d68 ffffffffb669c37b
0000000000000918
[    1.835754]  0000000000000000 ffff88042d5e3da8 ffffffffb6080d67
ffff88042d5e3da8
[    1.835765]  0000000000000001 0000000000000000 0000000000008000
0000000000000000
[    1.835777] Call Trace:
[    1.835789]  [<ffffffffb669c37b>] dump_stack+0x45/0x57
[    1.835799]  [<ffffffffb6080d67>] warn_slowpath_common+0x97/0xe0
[    1.835806]  [<ffffffffb6080dca>] warn_slowpath_null+0x1a/0x20
[    1.835813]  [<ffffffffb603eeb4>] setup_local_APIC+0x284/0x340
[    1.835824]  [<ffffffffb6d7c29d>] apic_bsp_setup+0x5b/0xb0
[    1.835832]  [<ffffffffb6d79fa7>] native_smp_prepare_cpus+0x23b/0x295
[    1.835842]  [<ffffffffb6d6c1b9>] kernel_init_freeable+0xc7/0x20f
[    1.835853]  [<ffffffffb668d5c0>] ? rest_init+0x80/0x80
[    1.835860]  [<ffffffffb668d5ce>] kernel_init+0xe/0xf0
[    1.835870]  [<ffffffffb66a2fe2>] ret_from_fork+0x42/0x70
[    1.835877]  [<ffffffffb668d5c0>] ? rest_init+0x80/0x80
[    1.835891] ---[ end trace bdbe630a8de2832c ]---
[    1.837613] Spurious LAPIC timer interrupt on cpu 0
[    1.837957] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    1.939574] smpboot: CPU0: Intel Westmere E56xx/L56xx/X56xx
(Nehalem-C) (fam: 06, model: 2c, stepping: 01)
[    1.939630] Performance Events: unsupported p6 CPU model 44 no PMU
driver, software events only.
[    1.950868] KVM setup paravirtual spinlock

Greets,
Stefan