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Date:   Mon, 27 Feb 2017 12:58:40 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:     kernel test robot <xiaolong.ye@...el.com>,
        Jonathan Woithe <jwoithe@...t42.net>,
        Darren Hart <dvhart@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Michał Kępień <kernel@...pniu.pl>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, lkp@...org
Subject: [platform/x86] 84c2f235ad BUG: KASAN: null-ptr-deref on address
 0000000000000008

Hi Alan,

Here is another bisect result. The attached reproduce-* script may
help debug the issue.

git://git.infradead.org/users/dvhart/linux-platform-drivers-x86.git testing

commit 84c2f235ad130cf59911fdd1970d297d28540d35
Author:     Alan Jenkins <alan-jenkins@...fmail.co.uk>
AuthorDate: Wed Feb 8 14:46:31 2017 +0100
Commit:     Darren Hart <dvhart@...ux.intel.com>
CommitDate: Fri Feb 24 23:54:45 2017 -0800

     platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present
     
     As the backlight device registered by fujitsu-laptop relies on the
     FUJ02B1 ACPI device being present, only register the backlight device
     once that ACPI device is detected.  Drop redundant max_brightness local
     variable.  Assign current brightness before registering the backlight
     device.  Adjust indentation to make checkpatch happy.
     
     Signed-off-by: Alan Jenkins <alan-jenkins@...fmail.co.uk>
     [kempniu: rebase patch, rewrite commit message]
     Signed-off-by: Michał Kępień <kernel@...pniu.pl>
     Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
     Reviewed-by: Jonathan Woithe <jwoithe@...t42.net>

817d65498f  platform/x86: fujitsu-laptop: simplify acpi_bus_register_driver() error handling
84c2f235ad  platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present
+------------------------------------------+------------+------------+
|                                          | 817d65498f | 84c2f235ad |
+------------------------------------------+------------+------------+
| boot_successes                           | 81         | 0          |
| boot_failures                            | 11         | 26         |
| invoked_oom-killer:gfp_mask=0x           | 7          |            |
| Mem-Info                                 | 7          |            |
| Out_of_memory:Kill_process               | 7          |            |
| BUG:kernel_hang_in_test_stage            | 1          |            |
| BUG:kernel_hang_in_boot_stage            | 3          |            |
| BUG:KASAN:null-ptr-deref_on_address      | 0          | 26         |
| BUG:unable_to_handle_kernel              | 0          | 26         |
| Oops                                     | 0          | 26         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 26         |
+------------------------------------------+------------+------------+

[   60.038293] acer_wmi: Acer Laptop ACPI-WMI Extras
[   60.039141] acer_wmi: No or unsupported WMI interface, unable to load
[   60.040390] Initializing HPQ6001 module
[   60.044011] fujitsu_laptop: call_fext_func: FUNC interface is not present
[   60.045221] ==================================================================
[   60.046471] BUG: KASAN: null-ptr-deref on address 0000000000000008
[   60.047668] Write of size 4 by task swapper/0/1
[   60.048457] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-rc6-00053-g84c2f23 #1
[   60.049738] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   60.051534] Call Trace:
[   60.051975]  dump_stack+0x63/0x8d
[   60.052563]  kasan_report_error+0xdc/0x470
[   60.053272]  kasan_report+0x33/0x40
[   60.053886]  ? fujitsu_init+0x249/0x304
[   60.054560]  __asan_store4+0x6e/0x70
[   60.055245]  fujitsu_init+0x249/0x304
[   60.056025]  ? hotkey_init+0xb35/0xb35
[   60.056684]  do_one_initcall+0xf1/0x1c8
[   60.057356]  ? repair_env_string+0x2f/0x73
[   60.058065]  ? start_kernel+0x4b3/0x4b3
[   60.058854]  ? parse_args+0x3a0/0x4f0
[   60.059498]  ? do_early_param+0xb5/0xb5
[   60.060163]  kernel_init_freeable+0x1b9/0x25e
[   60.060921]  ? rest_init+0xe0/0xe0
[   60.061522]  kernel_init+0xe/0x110
[   60.062113]  ? rest_init+0xe0/0xe0
[   60.062717]  ret_from_fork+0x2c/0x40
[   60.063341] ==================================================================
[   60.064700] Disabling lock debugging due to kernel taint
[   60.065733] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[   60.067077] IP: fujitsu_init+0x249/0x304
[   60.067781] PGD 0 
[   60.067783] 
[   60.068427] Oops: 0002 [#1] SMP KASAN
[   60.069065] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B           4.10.0-rc6-00053-g84c2f23 #1
[   60.070564] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[   60.088409] task: ffff8800002aa040 task.stack: ffff8800002b0000
[   60.089432] RIP: 0010:fujitsu_init+0x249/0x304
[   60.090192] RSP: 0000:ffff8800002b7e10 EFLAGS: 00010296
[   60.091107] RAX: ffff8800002aa040 RBX: 0000000000000000 RCX: ffffffff81132406
[   60.092330] RDX: 1ffffffff0985844 RSI: 0000000000000003 RDI: 0000000000000286
[   60.093410] RBP: ffff8800002b7e20 R08: 0000000000000003 R09: 0000000000000000
[   60.094442] R10: ffff8800002b7c90 R11: 6775626564206b63 R12: 0000000000000000
[   60.095547] R13: 0000000000000000 R14: ffff8800002b7eb8 R15: 00000000ffffffff
[   60.096740] FS:  0000000000000000(0000) GS:ffff880018a00000(0000) knlGS:0000000000000000
[   60.098122] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   60.099103] CR2: 0000000000000008 CR3: 0000000004a27000 CR4: 00000000000006f0
[   60.100324] Call Trace:
[   60.100770]  ? hotkey_init+0xb35/0xb35
[   60.101428]  do_one_initcall+0xf1/0x1c8
[   60.102090]  ? repair_env_string+0x2f/0x73
[   60.102807]  ? start_kernel+0x4b3/0x4b3
[   60.103556]  ? parse_args+0x3a0/0x4f0
[   60.104196]  ? do_early_param+0xb5/0xb5
[   60.104875]  kernel_init_freeable+0x1b9/0x25e
[   60.105637]  ? rest_init+0xe0/0xe0
[   60.106234]  kernel_init+0xe/0x110
[   60.106831]  ? rest_init+0xe0/0xe0
[   60.107437]  ret_from_fork+0x2c/0x40
[   60.108058] Code: 24 38 49 8d 7c 24 08 e8 fb c1 8b fb 41 c7 44 24 08 04 00 00 00 eb 1d e8 5b c2 8b fb 4d 8b 64 24 38 49 8d 7c 24 08 e8 dc c1 8b fb <41> c7 44 24 08 00 00 00 00 48 c7 c7 00 c6 26 84 e8 d1 d8 84 fb 
[   60.111346] RIP: fujitsu_init+0x249/0x304 RSP: ffff8800002b7e10
[   60.112428] CR2: 0000000000000008
[   60.113013] ---[ end trace d167d8189ac2ad2a ]---
[   60.113813] Kernel panic - not syncing: Fatal exception

git bisect start 0acdc349b86c481b5e17b8a6b54a1191882ebbad c470abd4fde40ea6a0846a2beab642a578c0b8cd --
git bisect  bad 6186dc8bb99152e49617d52fcb77622dfae315e9  # 12:20      0-      2  Merge 'linux-review/Abel-Vesa/arm-ftrace-Adds-support-for-CONFIG_DYNAMIC_FTRACE_WITH_REGS/20170225-070220' into devel-hourly-2017022603
git bisect good f4d7f23c0a2c571678167b01d6273ec60381fb03  # 12:39     20+      7  Merge 'linux-review/Michal-Suchanek/tpm-ibmvtpm-simplify-crq-initialization-and-document-crq-format/20170225-034100' into devel-hourly-2017022603
git bisect  bad b4786b009829e6b45488d3e6e57c6c92b2df1074  # 12:55      0-      2  Merge 'linux-review/Sean-Young/rc-raw-decoder-for-keymap-protocol-is-not-loaded-on-register/20170223-072140' into devel-hourly-2017022603
git bisect  bad 8257a2ad6e31c4dcfd888be74365cecf3741ed00  # 13:10      0-      1  Merge 'linux-review/Lepton-Wu/mtd-Fix-mtdblock-for-4GB-MTD-devices/20170222-111155' into devel-hourly-2017022603
git bisect  bad 084d95812bfb394356a0cabe799a6b84b49ab877  # 13:28      0-      1  Merge 'linux-review/Raju-Lakkaraju/net-phy-Fix-LED-mode-in-DT-single-property/20170224-185342' into devel-hourly-2017022603
git bisect  bad 6f788f444a946365c9f2aeb41e56206808fd4125  # 13:50      0-      3  Merge 'platform-drivers-x86/testing' into devel-hourly-2017022603
git bisect good 62dc54925a4dc4fe94e293d5e8205200969c28c9  # 14:13     22+      3  Merge 'linux-review/Tobin-C-Harding/cciss-Fix-coccinelle-checkpatch-warnings/20170222-135714' into devel-hourly-2017022603
git bisect good bb70ba316db25b2d6dd8c4dfb452b740180bae3c  # 14:41     22+      1  Merge 'linux-review/yuantian-tang-nxp-com/cpufreq-qoriq-clean-up-unused-code/20170221-152534' into devel-hourly-2017022603
git bisect good 6db8eb98474586a52042bd33c7fad23238b3628f  # 15:16     20+      1  Merge 'mac80211/master' into devel-hourly-2017022603
git bisect good 5cb44ee2f4dde68d83a3e17c3333bc4099003669  # 15:49     21+      1  platform/x86: intel_mid_powerbtn: Move comment to where it belongs
git bisect good bd5762a0c1c9ae66bd0ece6959bbc5013ab95dcd  # 16:29     20+      1  platform/x86: intel-hid: Support 5 button array
git bisect good 85de5e6668b51d55b9cba78c44079c900eeb7b8c  # 17:00     21+      0  platform/x86: fujitsu-laptop: replace numeric values with constants
git bisect  bad ec8c2841a71816e1de982a4a339c02d0a21bdb21  # 17:17      0-      3  platform/x86: fujitsu-laptop: autodetect LCD interface on all models
git bisect good 817d65498fea6a92790b538702e6a94d3abea09d  # 17:57     21+      3  platform/x86: fujitsu-laptop: simplify acpi_bus_register_driver() error handling
git bisect  bad 84c2f235ad130cf59911fdd1970d297d28540d35  # 18:11      0-      1  platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present
# first bad commit: [84c2f235ad130cf59911fdd1970d297d28540d35] platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present
git bisect good 817d65498fea6a92790b538702e6a94d3abea09d  # 21:16     65+     10  platform/x86: fujitsu-laptop: simplify acpi_bus_register_driver() error handling
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect  bad 84c2f235ad130cf59911fdd1970d297d28540d35  # 01:10      0-     26  platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present
# extra tests on HEAD of linux-devel/devel-hourly-2017022603
git bisect  bad 0acdc349b86c481b5e17b8a6b54a1191882ebbad  # 01:10      0-     13  0day head guard for 'devel-hourly-2017022603'
# extra tests on tree/branch platform-drivers-x86/testing
git bisect good 6dddfebdc1d79e507215e604523948058a68866e  # 02:36     62+      5  platform/x86: asus-wmi: Remove quirk_no_rfkill
# extra tests with first bad commit reverted
git bisect good 31389858ee4cf01f09ff5cb426b883e93546afde  # 04:22     63+      3  Revert "platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present"

---
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