INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 537 Comm: syz-executor3 Not tainted 5.0.0-rc3-next-20190124 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 assign_lock_key kernel/locking/lockdep.c:732 [inline]
 register_lock_class+0x19dc/0x1e60 kernel/locking/lockdep.c:758
 __lock_acquire+0x149/0x4a10 kernel/locking/lockdep.c:3207
 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3845
 __flush_work+0x787/0xa20 kernel/workqueue.c:2912
 flush_work+0x18/0x20 kernel/workqueue.c:2938
 vkms_atomic_crtc_destroy_state drivers/gpu/drm/vkms/vkms_crtc.c:139 [inline]
 vkms_atomic_crtc_destroy_state+0x2d/0x40 drivers/gpu/drm/vkms/vkms_crtc.c:131
 drm_atomic_state_default_clear+0x37c/0xd70 drivers/gpu/drm/drm_atomic.c:171
 drm_atomic_state_clear+0x9d/0xc0 drivers/gpu/drm/drm_atomic.c:240
 __drm_atomic_state_free+0x3c/0xf0 drivers/gpu/drm/drm_atomic.c:256
 kref_put include/linux/kref.h:67 [inline]
 drm_atomic_state_put include/drm/drm_atomic.h:419 [inline]
 drm_atomic_helper_set_config+0xe5/0x160 drivers/gpu/drm/drm_atomic_helper.c:2947
 drm_mode_setcrtc+0x73c/0x1870 drivers/gpu/drm/drm_crtc.c:707
 drm_ioctl_kernel+0x278/0x340 drivers/gpu/drm/drm_ioctl.c:758
 drm_ioctl+0x592/0xb50 drivers/gpu/drm/drm_ioctl.c:858
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458099
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd9363cfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099
RDX: 0000000020000080 RSI: 00000000c06864a2 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd9363d06d4
R13: 00000000004bfdd5 R14: 00000000004d1740 R15: 00000000ffffffff