linux-kernel - [lkp] [driver] 240d94dae48: BUG: unable to handle kernel NULL pointer dereference at (null)

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Date:	Tue, 14 Jul 2015 09:54:43 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [lkp] [driver] 240d94dae48: BUG: unable to handle kernel NULL
 pointer dereference at   (null)

FYI, we noticed the below changes on

git://git.collabora.co.uk/git/user/tomeu/linux.git ordered-probing-v3
commit 240d94dae48c0e526898bb54639622ca897323c9 ("driver-core: probe dependencies before probing")


+------------------------------------------------+------------+------------+
>                                                | 19a4ff36c0 | 240d94dae4 |
+------------------------------------------------+------------+------------+
> boot_successes                                 | 13         | 0          |
> boot_failures                                  | 10         | 11         |
> IP-Config:Auto-configuration_of_network_failed | 10         |            |
> BUG:unable_to_handle_kernel                    | 0          | 11         |
> Oops                                           | 0          | 11         |
> EIP_is_at_strlen                               | 0          | 11         |
> Kernel_panic-not_syncing:Fatal_exception       | 0          | 11         |
> backtrace:driver_register                      | 0          | 11         |
> backtrace:acpi_processor_driver_init           | 0          | 11         |
> backtrace:kernel_init_freeable                 | 0          | 11         |
+------------------------------------------------+------------+------------+


[    3.541810] ipmi_si: Unable to find any System Interface(s)
[    3.543488] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    3.545519] ACPI: Power Button [PWRF]
[    3.546656] BUG: unable to handle kernel NULL pointer dereference at   (null)
[    3.548538] IP: [<c13af6c2>] strlen+0x12/0x20
[    3.549744] *pde = 00000000 
[    3.550688] Oops: 0000 [#1] PREEMPT DEBUG_PAGEALLOC 
[    3.552211] Modules linked in:
[    3.553181] CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.0-rc1-next-20150709-00030-g240d94d #1
[    3.555218] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[    3.557547] task: d40a0000 ti: d409c000 task.ti: d409c000
[    3.558811] EIP: 0060:[<c13af6c2>] EFLAGS: 00010246 CPU: 0
[    3.560095] EIP is at strlen+0x12/0x20
[    3.561071] EAX: 00000000 EBX: d4115400 ECX: ffffffff EDX: d409de58
[    3.562489] ESI: 00000000 EDI: 00000000 EBP: d409ddf0 ESP: d409ddec
[    3.563915]  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[    3.565173] CR0: 80050033 CR2: 00000000 CR3: 01f2a000 CR4: 00040690
[    3.566585] Stack:
[    3.567257]  00000000 d409de0c c1491cca d409de58 d415c7f8 d415c808 d409de58 d4002b90
[    3.570008]  d409de20 c151e637 00000000 00000000 c1c0e008 d409de70 c15167f1 d409de34
[    3.572757]  c1094c5d 00000000 d409de70 c17e6140 00000000 00000001 00000000 00000000
[    3.575508] Call Trace:
[    3.576260]  [<c1491cca>] regulator_get_dependencies+0x6a/0x130
[    3.577621]  [<c151e637>] fwnode_get_dependencies+0x27/0x80
[    3.579215]  [<c15167f1>] driver_probe_device+0x5d1/0x970
[    3.580478]  [<c1094c5d>] ? preempt_count_sub+0x5d/0x60
[    3.581713]  [<c17e6140>] ? mutex_lock_nested+0x4d0/0x5a0
[    3.582986]  [<c1516c79>] __driver_attach+0xe9/0x100
[    3.584169]  [<c1516b90>] ? driver_probe_device+0x970/0x970
[    3.585469]  [<c15134c8>] bus_for_each_dev+0x58/0xa0
[    3.586663]  [<c1515d5e>] driver_attach+0x1e/0x20
[    3.587801]  [<c1516b90>] ? driver_probe_device+0x970/0x970
[    3.589096]  [<c1515257>] bus_add_driver+0x287/0x400
[    3.590339]  [<c1517e04>] driver_register+0xa4/0x170
[    3.591535]  [<c1eceba3>] ? acpi_fan_driver_init+0x11/0x11
[    3.611636]  [<c1ecebd3>] acpi_processor_driver_init+0x30/0x66
[    3.613420]  [<c1000602>] do_one_initcall+0x222/0x2f0
[    3.614627]  [<c1eceba3>] ? acpi_fan_driver_init+0x11/0x11
[    3.615912]  [<c10878a9>] ? parse_args+0x499/0x700
[    3.617075]  [<c1e96f30>] ? kernel_init_freeable+0xd7/0x1b9
[    3.618376]  [<c1e96f50>] kernel_init_freeable+0xf7/0x1b9
[    3.619642]  [<c17dafd1>] kernel_init+0x11/0x160
[    3.620783]  [<c109515f>] ? schedule_tail+0x4f/0xc0
[    3.621968]  [<c17eaf20>] ret_from_kernel_thread+0x20/0x30
[    3.623250]  [<c17dafc0>] ? rest_init+0xb0/0xb0
[    3.624369] Code: f7 be 01 00 00 00 89 f0 48 5e 5d c3 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 57 e8 a3 c4 43 00 b9 ff ff ff ff 89 c7 31 c0 <f2> ae 5f b8 fe ff ff ff 29 c8 5d c3 66 90 55 89 e5 e8 84 c4 43
[    3.635364] EIP: [<c13af6c2>] strlen+0x12/0x20 SS:ESP 0068:d409ddec
[    3.637011] CR2: 0000000000000000
[    3.637923] ---[ end trace be5768d6a3053144 ]---
[    3.639058] Kernel panic - not syncing: Fatal exception



Thanks,
Ying Huang
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