------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x26c/0x2f4 drivers/gpu/drm/vkms/vkms_crtc.c:41
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc3-syzkaller-00020-g1df27313f50a #0
Hardware name: linux,dummy-virt (DT)
pstate: 20000085 (nzCv daIf -PAN -UAO -TCO BTYPE=--)
pc : vkms_vblank_simulate+0x26c/0x2f4 drivers/gpu/drm/vkms/vkms_crtc.c:21
lr : hrtimer_forward_now include/linux/hrtimer.h:510 [inline]
lr : vkms_vblank_simulate+0x90/0x2f4 drivers/gpu/drm/vkms/vkms_crtc.c:19
sp : ffff00006ab32350
x29: ffff00006ab32350 x28: ffff0000099b1e58 
x27: dfff800000000000 x26: ffff00006ab1d540 
x25: 1fffe0000d563ab1 x24: 1fffe0000d563aaa 
x23: ffff0000099b0d30 x22: 0000000000fe4c00 
x21: ffff00006ab1d540 x20: ffff0000099b0e58 
x19: ffff0000099b1e58 x18: ffff00006ab3fb48 
x17: 0000000000000000 x16: 0000000000000003 
x15: ffff8000172b6810 x14: 1fffe0000d566420 
x13: 0000000000000001 x12: 0000000000000033 
x11: 1fffe0000112e11e x10: 0000000000000007 
x9 : 1fffe0000112e126 x8 : ffff800015e18c00 
x7 : 00000000f1f1f1f1 x6 : dfff800000000000 
x5 : 7fffffffffffffff x4 : 000000071d31c970 
x3 : 000000071e301570 x2 : 000000071d31c970 
x1 : 000000071e301570 x0 : 0000000000000002 
Call trace:
 vkms_vblank_simulate+0x26c/0x2f4 drivers/gpu/drm/vkms/vkms_crtc.c:41
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x590/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x2e0/0x910 kernel/time/hrtimer.c:1663
 timer_handler drivers/clocksource/arm_arch_timer.c:647 [inline]
 arch_timer_handler_phys+0x4c/0x70 drivers/clocksource/arm_arch_timer.c:665
 handle_percpu_devid_irq+0x19c/0x330 kernel/irq/chip.c:930
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 generic_handle_irq kernel/irq/irqdesc.c:652 [inline]
 __handle_domain_irq+0x11c/0x1f0 kernel/irq/irqdesc.c:689
 handle_domain_irq include/linux/irqdesc.h:176 [inline]
 gic_handle_irq+0x5c/0x1b0 drivers/irqchip/irq-gic.c:370
 el1_irq+0xb4/0x180 arch/arm64/kernel/entry.S:669
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:124 [inline]
 queue_work_on+0x74/0x110 kernel/workqueue.c:1528
 queue_work include/linux/workqueue.h:507 [inline]
 call_usermodehelper_exec+0x268/0x430 kernel/umh.c:433
 kobject_uevent_env+0xaf8/0x10d0 lib/kobject_uevent.c:617
 kobject_uevent+0x14/0x20 lib/kobject_uevent.c:641
 driver_register+0x208/0x410 drivers/base/driver.c:179
 usb_register_driver+0x1c4/0x3c0 drivers/usb/core/driver.c:1065
 udl_driver_init+0x24/0x30 drivers/gpu/drm/udl/udl_drv.c:145
 do_one_initcall+0x138/0x9a0 init/main.c:1226
 do_initcall_level init/main.c:1299 [inline]
 do_initcalls init/main.c:1315 [inline]
 do_basic_setup init/main.c:1335 [inline]
 kernel_init_freeable+0x6c4/0x72c init/main.c:1537
 kernel_init+0x14/0x124 init/main.c:1424
 ret_from_fork+0x10/0x3c arch/arm64/kernel/entry.S:958