FYI, we noticed the following commit (built with gcc-7): commit: 5c4eb8dc7854b0300ddfc5d52614cb9e5286c88d ("drm/mm: Use debugobject to track lifetimes") url: https://github.com/0day-ci/linux/commits/UPDATE-20200313-044153/Chris-Wilson/drm-mm-Use-debugobject-to-track-lifetimes/20200313-035156 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-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +---------------------------------------------------+------------+------------+ | | 6b843f9948 | 5c4eb8dc78 | +---------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 48 | 4 | | BUG:kernel_in_stage | 48 | 2 | | RIP:clear_page_orig | 1 | | | WARNING:at_lib/debugobjects.c:#debug_print_object | 0 | 4 | | RIP:debug_print_object | 0 | 4 | +---------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot [ 46.916389] WARNING: CPU: 0 PID: 1 at lib/debugobjects.c:488 debug_print_object+0x72/0x90 [ 46.917613] Modules linked in: [ 46.917613] CPU: 0 PID: 1 Comm: swapper Not tainted 5.6.0-rc5-01356-g5c4eb8dc7854b #1 [ 46.917613] RIP: 0010:debug_print_object+0x72/0x90 [ 46.917613] Code: 83 c2 01 8b 4b 14 4d 8b 04 24 89 15 8c c3 6d 03 8b 53 10 4c 89 ee 48 c7 c7 b8 87 0e 83 48 8b 14 d5 c0 be b1 82 e8 ae 05 9c ff <0f> 0b 5b 83 05 e8 94 20 02 01 41 5c 41 5d 5d c3 83 05 db 94 20 02 [ 46.917613] RSP: 0000:ffff8882378bbb48 EFLAGS: 00010292 [ 46.917613] RAX: 0000000000000052 RBX: ffff8882378bbb70 RCX: ffffffff8111e582 [ 46.917613] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 00000000ffffffff [ 46.917613] RBP: ffff8882378bbb60 R08: 00000013f9d8969d R09: 0000000000000000 [ 46.917613] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff837595a0 [ 46.917613] R13: ffffffff83099ab1 R14: ffffffff84e6de08 R15: 0000000000000000 [ 46.917613] FS: 0000000000000000(0000) GS:ffffffff83498000(0000) knlGS:0000000000000000 [ 46.917613] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.917613] CR2: 00000000030a7000 CR3: 000000000347c000 CR4: 00000000000406b0 [ 46.917613] Call Trace: [ 46.917613] debug_object_activate+0x1c9/0x200 [ 46.917613] ? retint_kernel+0x2a/0x2a [ 46.917613] drm_mm_reserve_node+0x131/0x210 [ 46.917613] ? drm_mm_reserve_node+0x131/0x210 [ 46.917613] igt_init+0xee/0x1a0 [ 46.917613] ? kvm_async_pf_task_wait+0x1d5/0x230 [ 46.917613] ? lockdep_hardirqs_on+0x179/0x1a0 [ 46.917613] test_drm_mm_init+0xf4/0x155 [ 46.917613] ? drm_kms_helper_init+0x10/0x10 [ 46.917613] ? rdinit_setup+0x40/0x40 [ 46.917613] do_one_initcall+0x124/0x330 [ 46.917613] ? rdinit_setup+0x40/0x40 [ 46.917613] ? rcu_read_lock_sched_held+0x2c/0x60 [ 46.917613] ? rdinit_setup+0x40/0x40 [ 46.917613] kernel_init_freeable+0x1b5/0x24f [ 46.917613] ? rest_init+0x280/0x280 [ 46.917613] kernel_init+0x13/0x160 [ 46.917613] ? schedule_tail+0x63/0x70 [ 46.917613] ? rest_init+0x280/0x280 [ 46.917613] ret_from_fork+0x3a/0x50 [ 46.917613] irq event stamp: 13553994 [ 46.917613] hardirqs last enabled at (13553993): [] console_unlock+0x608/0x6a0 [ 46.917613] hardirqs last disabled at (13553994): [] trace_hardirqs_off_thunk+0x1a/0x1c [ 46.917613] softirqs last enabled at (13553626): [] __do_softirq+0x392/0x3cb [ 46.917613] softirqs last disabled at (13553619): [] irq_exit+0x6c/0xc0 [ 46.917613] random: get_random_bytes called from print_oops_end_marker+0x2c/0x60 with crng_init=0 [ 46.917613] ---[ end trace 90b5e6eaaffefc52 ]--- To reproduce: # build kernel cd linux cp config-5.6.0-rc5-01356-g5c4eb8dc7854b .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k job-script # job-script is attached in this email Thanks, Rong Chen