FYI, we noticed the following commit:

commit: 84c2f235ad130cf59911fdd1970d297d28540d35 ("platform/x86: fujitsu-laptop: only register backlight device if FUJ02B1 is present")
git://git.infradead.org/users/dvhart/linux-platform-drivers-x86.git testing

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu IvyBridge -smp 2 -m 1G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+------------------------------------------------+------------+------------+
|                                                | 817d65498f | 84c2f235ad |
+------------------------------------------------+------------+------------+
| boot_successes                                 | 2          | 0          |
| boot_failures                                  | 18         | 18         |
| Kernel_panic-not_syncing:softlockup:hung_tasks | 18         |            |
| general_protection_fault:#[##]KASAN            | 0          | 18         |
| Kernel_panic-not_syncing:Fatal_exception       | 0          | 18         |
+------------------------------------------------+------------+------------+



[   25.324101] acerhdf: error getting hardware information
[   25.325373] hdaps: supported laptop not found!
[   25.326617] hdaps: driver init failed (ret=-19)!
[   25.328480] kasan: CONFIG_KASAN_INLINE enabled
[   25.329196] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   25.330333] general protection fault: 0000 [#1] KASAN
[   25.331133] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc6-00053-g84c2f23 #2
[   25.332287] task: ffff88002d908000 task.stack: ffff88002d910000
[   25.333191] RIP: 0010:fujitsu_init+0x5fe/0x7b0
[   25.333886] RSP: 0000:ffff88002d917de8 EFLAGS: 00010202
[   25.334698] RAX: dffffc0000000000 RBX: 1d6f24363de6ff2e RCX: 0000000000000000
[   25.335800] RDX: 0000000000000001 RSI: ffffffff99fb6c40 RDI: 0000000000000008
[   25.336883] RBP: ffff88002d917e00 R08: ffff88003ffd301c R09: 0000000000000000
[   25.337975] R10: dffffc0000000000 R11: ffffffff9b78af20 R12: 0000000000000000
[   25.339074] R13: 0000000000000000 R14: ffff88002d917ea0 R15: ffffffff9acc7c38
[   25.340168] FS:  0000000000000000(0000) GS:ffffffff9a442000(0000) knlGS:0000000000000000
[   25.341397] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.342342] CR2: 0000000000000000 CR3: 000000001ee20000 CR4: 00000000001406b0
[   25.343443] Call Trace:
[   25.343835]  ? hdaps_init+0x52/0x52
[   25.344381]  do_one_initcall+0x16b/0x2ff
[   25.345009]  ? start_kernel+0x808/0x808
[   25.345610]  kernel_init_freeable+0x36a/0x4d2
[   25.346287]  ? rest_init+0xe0/0xe0
[   25.346821]  kernel_init+0xe/0x110
[   25.347357]  ? rest_init+0xe0/0xe0
[   25.347891]  ret_from_fork+0x2c/0x40
[   25.348454] Code: e8 04 14 e7 fd 4d 8b 6d 38 48 b8 0a 48 30 61 7b b8 c6 3b 48 01 c3 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 08 48 89 fa 48 c1 ea 03 <8a> 04 02 84 c0 74 0d 3c 03 7f 09 48 c1 cb 13 e8 ca 14 e7 fd 48 
[   25.351363] RIP: fujitsu_init+0x5fe/0x7b0 RSP: ffff88002d917de8
[   25.352318] ---[ end trace 7f86702e329cad63 ]---
[   25.353059] Kernel panic - not syncing: Fatal exception
[   25.353889] Kernel Offset: 0x17800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Elapsed time: 30

initrds=(


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong