linux-kernel - [LKP] [x86/xen] 7a0ea6c5b3e: WARNING: CPU: 0 PID: 1 at arch/x86/xen/apic.c:76 xen_apic

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Date:	Mon, 16 Mar 2015 09:42:48 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [x86/xen] 7a0ea6c5b3e: WARNING: CPU: 0 PID: 1 at
 arch/x86/xen/apic.c:76 xen_apic_write+0x28/0x30()

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip devel/for-linus-4.1
commit 7a0ea6c5b3ee63edf5d5f1f7bb61ccf964929b08 ("x86/xen: Provide a "Xen PV" APIC driver to support >255 VCPUs")


+--------------------------------------------------+------------+------------+
|                                                  | dbc36df319 | 7a0ea6c5b3 |
+--------------------------------------------------+------------+------------+
| boot_successes                                   | 24         | 0          |
| boot_failures                                    | 0          | 30         |
| WARNING:at_arch/x86/xen/apic.c:#xen_apic_write() | 0          | 30         |
| backtrace:native_smp_prepare_cpus                | 0          | 30         |
| backtrace:kernel_init_freeable                   | 0          | 30         |
+--------------------------------------------------+------------+------------+


[    0.047669] ftrace: allocating 31817 entries in 125 pages
[    0.057055] Getting VERSION: 0
[    0.058004] ------------[ cut here ]------------
[    0.059017] WARNING: CPU: 0 PID: 1 at arch/x86/xen/apic.c:76 xen_apic_write+0x28/0x30()
[    0.060003] register: 30, value: ff00ff
[    0.060860] Modules linked in:
[    0.061470] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc1-00011-g811bf96 #7
[    0.062003] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    0.063003]  ffffffff81b7bfa0 ffff880011e63d68 ffffffff818aaa49 0000000000000a08
[    0.065004]  ffff880011e63db8 ffff880011e63da8 ffffffff8107272a 0000000000000000
[    0.067003]  0000000000000000 000000000000a108 000000000000a110 0000000000000001
[    0.069003] Call Trace:
[    0.070007]  [<ffffffff818aaa49>] dump_stack+0x4c/0x65
[    0.071006]  [<ffffffff8107272a>] warn_slowpath_common+0x8a/0xc0
[    0.072005]  [<ffffffff810727a6>] warn_slowpath_fmt+0x46/0x50
[    0.073005]  [<ffffffff810122d8>] xen_apic_write+0x28/0x30
[    0.074006]  [<ffffffff81e7899a>] verify_local_APIC+0x4e/0x1b7
[    0.075007]  [<ffffffff81e76b39>] native_smp_prepare_cpus+0x221/0x2c7
[    0.076006]  [<ffffffff81e650a4>] kernel_init_freeable+0xfb/0x248
[    0.077006]  [<ffffffff8189df90>] ? rest_init+0x90/0x90
[    0.078005]  [<ffffffff8189df9e>] kernel_init+0xe/0xf0
[    0.079005]  [<ffffffff818b2c3c>] ret_from_fork+0x7c/0xb0
[    0.080005]  [<ffffffff8189df90>] ? rest_init+0x90/0x90
[    0.081006] ---[ end trace 4f43b2a59b6f8b66 ]---
[    0.082003] Getting VERSION: 0



Thanks,
Ying Huang


View attachment "config-4.0.0-rc1-00008-g7a0ea6c" of type "text/plain" (128991 bytes)

View attachment ".dmesg" of type "text/plain" (38377 bytes)

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