------------[ cut here ]------------
WARNING: CPU: 1 PID: 1983 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x120/0x130 drivers/gpu/drm/vkms/vkms_crtc.c:41
Modules linked in:
CPU: 1 PID: 1983 Comm: kworker/u4:5 Not tainted 5.12.0-rc3-syzkaller-00036-gbf152b0b41dc #0
Hardware name: linux,dummy-virt (DT)
pstate: 20400089 (nzCv daIf +PAN -UAO -TCO BTYPE=--)
pc : vkms_vblank_simulate+0x120/0x130 drivers/gpu/drm/vkms/vkms_crtc.c:21
lr : hrtimer_forward_now include/linux/hrtimer.h:510 [inline]
lr : vkms_vblank_simulate+0x3c/0x130 drivers/gpu/drm/vkms/vkms_crtc.c:19
sp : ffff80001000be30
x29: ffff80001000be30 x28: ffff00007fbd4e00 
x27: ffff00007fbd4e40 x26: ffff8000107fe400 
x25: 0000000000000000 x24: 0000000000000001 
x23: 0000000000000080 x22: 00000005fdfdb2e0 
x21: 0000000000fe4c00 x20: faff0000032a4628 
x19: faff0000032a5498 x18: 00000000fffffffb 
x17: 0000000000000001 x16: 0000000000000001 
x15: 00006297789f4580 x14: 0000000000000126 
x13: 0000000000000001 x12: 000000000000001d 
x11: 0000000000000003 x10: 0000000000000126 
x9 : 0000000008e335da x8 : 00000005fd8ed7b0 
x7 : 7fffffffffffffff x6 : 00000005fd8ed7b0 
x5 : 00000005fd8ed7b0 x4 : faff0000032a5498 
x3 : 00000005fe8d23b0 x2 : 00000005fd8ed7b0 
x1 : 00000005fe8d23b0 x0 : 0000000000000002 
Call trace:
 vkms_vblank_simulate+0x120/0x130 drivers/gpu/drm/vkms/vkms_crtc.c:41
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x140/0x1e0 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0xe8/0x2c0 kernel/time/hrtimer.c:1663
 timer_handler drivers/clocksource/arm_arch_timer.c:647 [inline]
 arch_timer_handler_phys+0x38/0x50 drivers/clocksource/arm_arch_timer.c:665
 handle_percpu_devid_irq+0x84/0x150 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+0x7c/0xe0 kernel/irq/irqdesc.c:689
 handle_domain_irq include/linux/irqdesc.h:176 [inline]
 gic_handle_irq+0x50/0xd0 drivers/irqchip/irq-gic.c:370
 el1_irq+0xb4/0x180 arch/arm64/kernel/entry.S:669
 slab_pre_alloc_hook mm/slab.h:499 [inline]
 slab_alloc_node mm/slub.c:2826 [inline]
 slab_alloc mm/slub.c:2915 [inline]
 kmem_cache_alloc+0x6c/0x33c mm/slub.c:2920
 kmem_cache_zalloc include/linux/slab.h:674 [inline]
 __alloc_file+0x2c/0xf0 fs/file_table.c:101
 alloc_empty_file+0x60/0x100 fs/file_table.c:150
 path_openat+0x44/0xf10 fs/namei.c:3484
 do_filp_open+0x74/0x124 fs/namei.c:3525
 do_open_execat+0x6c/0x1d0 fs/exec.c:913
 bprm_execve fs/exec.c:1805 [inline]
 bprm_execve+0x10c/0x55c fs/exec.c:1792
 kernel_execve+0x124/0x1a0 fs/exec.c:1973
 call_usermodehelper_exec_async+0xcc/0x140 kernel/umh.c:110
 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:958