FYI, we noticed the following commit (built with gcc-4.9):

commit: 3f96d20fafb19e6dd869362ace53662b06e6f6c1 ("[PATCH] debugobjects: Disable lockdep tracking of debugobjects internal locks")
url: https://github.com/0day-ci/linux/commits/Waiman-Long/debugobjects-Disable-lockdep-tracking-of-debugobjects-internal-locks/20180714-070310


in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-i386 -enable-kvm -m 256M

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


+----------------------------------------------------------+------------+------------+
|                                                          | 3951dbf232 | 3f96d20faf |
+----------------------------------------------------------+------------+------------+
| boot_successes                                           | 0          | 0          |
| boot_failures                                            | 15         | 8          |
| WARNING:at_mm/page_alloc.c:#__alloc_pages_nodemask       | 15         | 8          |
| EIP:__alloc_pages_nodemask                               | 15         | 8          |
| Mem-Info                                                 | 15         | 8          |
| WARNING:at_kernel/locking/lockdep.c:#register_lock_class | 0          | 8          |
| EIP:register_lock_class                                  | 0          | 8          |
+----------------------------------------------------------+------------+------------+



[    0.003333] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:704 register_lock_class+0x3f0/0x4e0
[    0.003333] Modules linked in:
[    0.003333] CPU: 0 PID: 0 Comm: swapper Not tainted 4.18.0-rc4-00144-g3f96d20 #1
[    0.003333] EIP: register_lock_class+0x3f0/0x4e0
[    0.003333] Code: 25 ff ff ff 68 a3 14 a7 81 68 6b fb a4 81 e8 47 48 fc ff 0f 0b 8b 15 4c a3 45 82 58 59 e9 0d ff ff ff 90 8d b4 26 00 00 00 00 <0f> 0b 8b 15 4c a3 45 82 e9 f8 fe ff ff 8d 76 00 8d 54 24 18 89 f8 
[    0.003333] EAX: 81a8242d EBX: 8219b130 ECX: 81d920c0 EDX: 00000000
[    0.003333] ESI: 00000000 EDI: 81bb4530 EBP: 00000000 ESP: 81b61e38
[    0.003333] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210012
[    0.003333] CR0: 80050033 CR2: ffbff000 CR3: 01d86000 CR4: 000006b0
[    0.003333] Call Trace:
[    0.003333]  ? __lock_acquire+0x65/0x1a90
[    0.003333]  ? pcpu_alloc+0x495/0x810
[    0.003333]  ? lock_release+0x126/0x290
[    0.003333]  ? lock_acquire+0xa2/0x190
[    0.003333]  ? __debug_object_init+0x255/0x450
[    0.003333]  ? _raw_spin_lock+0x1f/0x30
[    0.003333]  ? __debug_object_init+0x255/0x450
[    0.003333]  ? __debug_object_init+0x255/0x450
[    0.003333]  ? debug_mutex_init+0x21/0x30
[    0.003333]  ? alloc_desc+0x83/0x120
[    0.003333]  ? early_irq_init+0x14d/0x18b
[    0.003333]  ? start_kernel+0x3fa/0x60c
[    0.003333]  ? startup_32_smp+0x164/0x170
[    0.003333] irq event stamp: 0
[    0.003333] hardirqs last  enabled at (0): [<00000000>]   (null)
[    0.003333] hardirqs last disabled at (0): [<00000000>]   (null)
[    0.003333] softirqs last  enabled at (0): [<00000000>]   (null)
[    0.003333] softirqs last disabled at (0): [<00000000>]   (null)
[    0.003333] random: get_random_bytes called from init_oops_id+0x37/0x40 with crng_init=0
[    0.003333] ---[ end trace 2ecea7c3f5e2e513 ]---


To reproduce:

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



Thanks,
Xiaolong