------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x23e/0x242 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.12.0-rc5-syzkaller-00717-ge641318db4c2 #0
Hardware name: riscv-virtio,qemu (DT)
epc : vkms_vblank_simulate+0x23e/0x242 drivers/gpu/drm/vkms/vkms_crtc.c:21
 ra : vkms_vblank_simulate+0x23e/0x242 drivers/gpu/drm/vkms/vkms_crtc.c:21
epc : ffffffe000f5b92a ra : ffffffe000f5b92a sp : ffffffe0057d3b50
 gp : ffffffe004588b08 tp : ffffffe0057bdf00 t0 : 0000000000046000
 t1 : 0000000000000001 t2 : ffffffe000cdfaac s0 : ffffffe0057d3b90
 s1 : ffffffe00a8d9e58 a0 : 0000000000000000 a1 : 00000000000f0000
 a2 : 0000000000010001 a3 : ffffffe000f5b92a a4 : ffffffe0057bdf00
 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : ffffffe000f5b744
 s2 : ffffffe00a8d8d30 s3 : 0000000000000002 s4 : 0000000000fe4c00
 s5 : 0000000000001000 s6 : ffffffe067d651c8 s7 : 0000000000000000
 s8 : ffffffe067d65190 s9 : ffffffe00a8d9e90 s10: ffffffe067d65100
 s11: ffffffe000f5b6ec t3 : 7eb99b7a4a595f00 t4 : ffffffc400a08107
 t5 : ffffffc400a0810e t6 : ffffffe00ac164c8
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
Call Trace:
[<ffffffe000f5b92a>] vkms_vblank_simulate+0x23e/0x242 drivers/gpu/drm/vkms/vkms_crtc.c:21
[<ffffffe000121824>] __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
[<ffffffe000121824>] __hrtimer_run_queues+0x4aa/0x9ba kernel/time/hrtimer.c:1601
[<ffffffe000122514>] hrtimer_interrupt+0x1e6/0x50a kernel/time/hrtimer.c:1663
[<ffffffe001da54b2>] riscv_timer_interrupt+0x5c/0x6a drivers/clocksource/timer-riscv.c:88
[<ffffffe0000ef848>] handle_percpu_devid_irq+0x17e/0x2be kernel/irq/chip.c:930
[<ffffffe0000e4734>] generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
[<ffffffe0000e4734>] generic_handle_irq kernel/irq/irqdesc.c:652 [inline]
[<ffffffe0000e4734>] __handle_domain_irq+0x13e/0x1ea kernel/irq/irqdesc.c:689
[<ffffffe000a9126a>] handle_domain_irq include/linux/irqdesc.h:176 [inline]
[<ffffffe000a9126a>] riscv_intc_irq+0x82/0xcc drivers/irqchip/irq-riscv-intc.c:40
[<ffffffe000005580>] ret_from_exception+0x0/0x14
[<ffffffe00000575c>] wait_for_interrupt arch/riscv/include/asm/processor.h:66 [inline]
[<ffffffe00000575c>] arch_cpu_idle+0x10/0x20 arch/riscv/kernel/process.c:40