FYI, we noticed the following commit:

commit: 5b6f9b95f7aeddf8a77a991bf1657a84ca281ab0 ("staging: unisys: visorbus: get rid of create_bus_type.")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M

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


+------------------------------------------+------------+------------+
|                                          | 362f87f312 | 5b6f9b95f7 |
+------------------------------------------+------------+------------+
| boot_successes                           | 8          | 0          |
| boot_failures                            | 0          | 8          |
| kernel_BUG_at_drivers/base/driver.c      | 0          | 8          |
| invalid_opcode:#[##]                     | 0          | 8          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 8          |
+------------------------------------------+------------+------------+



[    8.388559] kernel BUG at drivers/base/driver.c:153!
[    8.390551] invalid opcode: 0000 [#1] DEBUG_PAGEALLOC
[    8.392425] CPU: 0 PID: 1 Comm: swapper Not tainted 4.11.0-rc4-00802-g5b6f9b9 #1
[    8.394507] task: ffff88000018bb80 task.stack: ffff880000184000
[    8.396386] RIP: 0010:driver_register+0x23/0x116
[    8.398106] RSP: 0000:ffff880000187e30 EFLAGS: 00010296
[    8.398845] RAX: 00000000ffffffff RBX: ffffffff848bc4c0 RCX: ffff88000018bb80
[    8.400886] RDX: ffff88001748cc38 RSI: ffff88001748b460 RDI: ffffffff848bc4c0
[    8.402928] RBP: ffff880000187e40 R08: ffff88001748d658 R09: 0000000000000000
[    8.406008] R10: ffff880000187c78 R11: 00000000002dbf72 R12: ffffffff848bbf00
[    8.430768] R13: 00000000ffffffff R14: ffffffff848f4792 R15: 0000000000000001
[    8.431780] FS:  0000000000000000(0000) GS:ffffffff8482e000(0000) knlGS:0000000000000000
[    8.432925] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.433746] CR2: 0000000000000000 CR3: 000000001d015000 CR4: 00000000000006f0
[    8.434871] Call Trace:
[    8.435357]  visorbus_register_visor_driver+0x41/0x62
[    8.436104]  visornic_init+0x9c/0xbf
[    8.436677]  ? visornic_change_mtu+0x10/0x10
[    8.437353]  do_one_initcall+0xa0/0x176
[    8.437909]  ? do_early_param+0xc0/0xc0
[    8.438560]  kernel_init_freeable+0x1a7/0x260
[    8.439330]  ? rest_init+0xc9/0xc9
[    8.439825]  kernel_init+0xf/0x138
[    8.440389]  ? rest_init+0xc9/0xc9
[    8.440939]  ret_from_fork+0x2c/0x40
[    8.441455] Code: 4c 89 e0 5b 41 5c 5d c3 55 48 89 e5 41 54 53 48 89 fb e8 36 9b d0 ff 4c 8b 63 08 49 83 bc 24 98 00 00 00 00 75 07 e8 22 9b d0 ff <0f> 0b e8 1b 9b d0 ff 49 83 7c 24 48 00 75 0f e8 0e 9b d0 ff 49 
[    8.444605] RIP: driver_register+0x23/0x116 RSP: ffff880000187e30
[    8.445560] ---[ end trace 06c354500c4eab13 ]---


To reproduce:

        git clone https://github.com/01org/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong