linux-kernel - [DEBUG] WARNING: CPU: 0 PID: 0 at init/main.c:689 start

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Message-ID: <20150205141640.GC3431@wfg-t540p.sh.intel.com>
Date:	Thu, 5 Feb 2015 06:16:40 -0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [DEBUG] WARNING: CPU: 0 PID: 0 at init/main.c:689
 start_kernel+0x3ca/0x3d6()

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kaslr/weak
commit eb316c41f6ff400a782fd3ef86797dee467d1f78 ("DEBUG: testing weak symbols during relocation")


+----------------------------------------+------------+------------+
|                                        | 5ee0e96260 | eb316c41f6 |
+----------------------------------------+------------+------------+
| boot_successes                         | 20         | 0          |
| early-boot-hang                        | 1          |            |
| boot_failures                          | 0          | 10         |
| WARNING:at_init/main.c:#start_kernel() | 0          | 10         |
+----------------------------------------+------------+------------+


[    0.016047] ftrace: allocating 17846 entries in 35 pages
[    0.020005] nosuchfn = 02e00000
[    0.020259] ------------[ cut here ]------------
[    0.023342] WARNING: CPU: 0 PID: 0 at init/main.c:689 start_kernel+0x3ca/0x3d6()
[    0.024078] Modules linked in:
[    0.024327] CPU: 0 PID: 0 Comm: swapper Not tainted 3.19.0-rc7-gfe2e699 #606
[    0.024866]  00000000 00000000 c442bf8c c4207e23 c442bfc0 c3e481c8 c43a0460 00000000
[    0.025586]  00000000 c438f7b1 000002b1 c44acaeb 000002b1 c44acaeb 00000800 00000000
[    0.026305]  cb885382 c442bfd0 c3e482a2 00000009 00000000 c442bfe8 c44acaeb c44e6100
[    0.027209] Call Trace:
[    0.027408]  [<c4207e23>] dump_stack+0x16/0x18
[    0.027785]  [<c3e481c8>] warn_slowpath_common+0x88/0xc0
[    0.028188]  [<c44acaeb>] ? start_kernel+0x3ca/0x3d6
[    0.028597]  [<c44acaeb>] ? start_kernel+0x3ca/0x3d6
[    0.028978]  [<c3e482a2>] warn_slowpath_null+0x22/0x30
[    0.029369]  [<c44acaeb>] start_kernel+0x3ca/0x3d6
[    0.029767]  [<c44ac2cf>] i386_start_kernel+0x79/0x7d
[    0.030008] ---[ end trace 4d5ff9f2f68c4233 ]---
[    0.030548] Performance Events: unsupported p6 CPU model 60 no PMU driver, software events only.



Thanks,
Fengguang

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