------------[ cut here ]------------
WARNING: CPU: 0 PID: 3897 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 3897 Comm: syz-executor.0 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<81802550>] (dump_backtrace) from [<818027c4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
 r7:00000080 r6:60000193 r5:00000000 r4:82b58344
[<818027ac>] (show_stack) from [<81809e98>] (__dump_stack lib/dump_stack.c:79 [inline])
[<818027ac>] (show_stack) from [<81809e98>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<81809de0>] (dump_stack) from [<81803358>] (panic+0x130/0x378 kernel/panic.c:231)
 r7:81f48198 r6:82a390a4 r5:00000000 r4:82c6b0d0
[<81803228>] (panic) from [<802446f4>] (__warn+0xb0/0x164 kernel/panic.c:605)
 r3:82a2248c r2:00000000 r1:00000000 r0:81f48198
 r7:00000015
[<80244644>] (__warn) from [<81803608>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
 r7:809fa964 r6:00000015 r5:81fcbd70 r4:00000000
[<818035a4>] (warn_slowpath_fmt) from [<809fa964>] (vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21)
 r8:00fe4c00 r7:84550720 r6:82a22498 r5:00000000 r4:84551390
[<809fa814>] (vkms_vblank_simulate) from [<80307ebc>] (__run_hrtimer kernel/time/hrtimer.c:1537 [inline])
[<809fa814>] (vkms_vblank_simulate) from [<80307ebc>] (__hrtimer_run_queues+0xd4/0x690 kernel/time/hrtimer.c:1601)
 r9:86c30000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:84551390
[<80307de8>] (__hrtimer_run_queues) from [<80308da0>] (hrtimer_interrupt+0x14c/0x2e0 kernel/time/hrtimer.c:1663)
 r10:ddfc54d8 r9:ddfc5498 r8:ddfc5458 r7:ddfc54a0 r6:ddfc54e0 r5:20000193
 r4:ddfc5380
[<80308c54>] (hrtimer_interrupt) from [<8114c308>] (timer_handler drivers/clocksource/arm_arch_timer.c:647 [inline])
[<80308c54>] (hrtimer_interrupt) from [<8114c308>] (arch_timer_handler_virt+0x30/0x38 drivers/clocksource/arm_arch_timer.c:658)
 r10:86c31e80 r9:86c31ee8 r8:86c31e50 r7:8348d940 r6:82a22c34 r5:0000001c
 r4:8348b000
[<8114c2d8>] (arch_timer_handler_virt) from [<802df904>] (handle_percpu_devid_irq+0xa4/0x19c kernel/irq/chip.c:930)
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (generic_handle_irq kernel/irq/irqdesc.c:652 [inline])
[<802df860>] (handle_percpu_devid_irq) from [<802d8730>] (__handle_domain_irq+0xb0/0x120 kernel/irq/irqdesc.c:689)
 r10:86c31e80 r9:86c31ee8 r8:00000001 r7:00000000 r6:828ad498 r5:00000000
 r4:828ad498 r3:00010002
[<802d8680>] (__handle_domain_irq) from [<8088af70>] (handle_domain_irq include/linux/irqdesc.h:176 [inline])
[<802d8680>] (__handle_domain_irq) from [<8088af70>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370)
 r10:8694d140 r9:40000193 r8:e000200c r7:828ad4bc r6:e0002000 r5:86c31ee8
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86c31ee8 to 0x86c31f30)
1ee0:                   00000000 821137b8 00000001 00000001 ddfcd180 83624840
1f00: 82a30340 82a22928 00000000 802881c8 8694d140 86c31f4c 86c31ee0 86c31f38
1f20: 8181dacc 81826adc 20000013 ffffffff
 r9:86c30000 r8:00000000 r7:86c31f1c r6:ffffffff r5:20000013 r4:81826adc
[<81826ab0>] (_raw_spin_unlock_irq) from [<8027f388>] (finish_lock_switch kernel/sched/core.c:4074 [inline])
[<81826ab0>] (_raw_spin_unlock_irq) from [<8027f388>] (finish_task_switch+0xac/0x258 kernel/sched/core.c:4191)
 r5:83624840 r4:ddfcd180
[<8027f2dc>] (finish_task_switch) from [<802881c8>] (schedule_tail+0x10/0xc4 kernel/sched/core.c:4258)
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:00000000
 r4:00000000
[<802881b8>] (schedule_tail) from [<80200104>] (ret_from_fork+0x4/0x20 arch/arm/kernel/entry-common.S:154)
Exception stack(0x86c31fb0 to 0x86c31ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 02843068 028434c0 00000000 00000078 00000000 00120000 001208c0 7edf0604
1fe0: 02843000 7edf0520 000495fc 00049624 60000010 01200011
 r5:00000000 r4:00000000
Rebooting in 86400 seconds..