------------[ cut here ]------------
WARNING: CPU: 0 PID: 7666 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: 7666 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 r7:8365a720 r6:82a22498 r5:00000000 r4:8365b390
[<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)
 r9:86b90000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:8365b390
[<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)
 r10:86b91c78 r9:86b91ce0 r8:86b91c48 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)
 r10:86b91c78 r9:86b91ce0 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)
 r10:86b8e180 r9:86b90000 r8:e000200c r7:828ad4bc r6:e0002000 r5:86b91ce0
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86b91ce0 to 0x86b91d28)
1ce0: 00000000 821137b8 00000001 01aa519d ddfcd180 835c8dc0 855d6180 82a22928
1d00: 00000402 8181f7ec 86b8e180 86b91d44 86b91cd8 86b91d30 8181dacc 81826adc
1d20: 20000013 ffffffff
 r9:86b90000 r8:00000402 r7:86b91d14 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)
 r5:835c8dc0 r4:ddfcd180
[<8027f2dc>] (finish_task_switch) from [<8181f7ec>] (context_switch kernel/sched/core.c:4325 [inline])
[<8027f2dc>] (finish_task_switch) from [<8181f7ec>] (__schedule+0x3e4/0xcc8 kernel/sched/core.c:5073)
 r10:fffffb84 r9:00000000 r8:00000000 r7:ddfcd190 r6:86b8e180 r5:855d6180
 r4:ddfcd180
[<8181f408>] (__schedule) from [<818202bc>] (preempt_schedule_common+0x3c/0xac kernel/sched/core.c:5233)
 r10:fffffb84 r9:82a22928 r8:ddfc53e0 r7:81820360 r6:00000001 r5:81820360
 r4:86b90000
[<81820280>] (preempt_schedule_common) from [<81820360>] (preempt_schedule+0x34/0x38 kernel/sched/core.c:5258)
 r7:00000040 r6:ddfc53e0 r5:ddfc5380 r4:20000013
[<8182032c>] (preempt_schedule) from [<81826b80>] (__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline])
[<8182032c>] (preempt_schedule) from [<81826b80>] (_raw_spin_unlock_irqrestore+0x70/0x8c kernel/locking/spinlock.c:191)
[<81826b10>] (_raw_spin_unlock_irqrestore) from [<803086ec>] (unlock_hrtimer_base kernel/time/hrtimer.c:915 [inline])
[<81826b10>] (_raw_spin_unlock_irqrestore) from [<803086ec>] (hrtimer_start_range_ns+0x1b4/0x30c kernel/time/hrtimer.c:1153)
 r5:00000001 r4:86b91ee8
[<80308538>] (hrtimer_start_range_ns) from [<81825ebc>] (hrtimer_start_expires include/linux/hrtimer.h:436 [inline])
[<80308538>] (hrtimer_start_range_ns) from [<81825ebc>] (hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1817 [inline])
[<80308538>] (hrtimer_start_range_ns) from [<81825ebc>] (do_nanosleep+0x84/0x214 kernel/time/hrtimer.c:1893)
 r10:00000000 r9:81825e80 r8:81f47e58 r7:832bba58 r6:86b91e80 r5:86b90000
 r4:86b91ee8
[<81825e38>] (do_nanosleep) from [<803091f0>] (hrtimer_nanosleep+0xf8/0x188 kernel/time/hrtimer.c:1949)
 r9:0000c350 r8:00000000 r7:0000c350 r6:00000001 r5:00000000 r4:000f4240
[<803090f8>] (hrtimer_nanosleep) from [<80314438>] (common_nsleep+0x5c/0x6c kernel/time/posix-timers.c:1227)
 r10:00000197 r9:86b90000 r8:80200224 r7:00000000 r6:81a04484 r5:7e8394f0
 r4:00000000
[<803143dc>] (common_nsleep) from [<80316a30>] (__do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline])
[<803143dc>] (common_nsleep) from [<80316a30>] (sys_clock_nanosleep+0xe8/0x148 kernel/time/posix-timers.c:1245)
 r5:7e8394f0 r4:00000000
[<80316948>] (sys_clock_nanosleep) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x86b91fa8 to 0x86b91ff0)
1fa0:                   00000000 00000000 00000000 00000000 7e8394e0 7e8394f0
1fc0: 00000000 00000000 00000000 00000197 7e8394f0 7e8394e0 029e64c0 7e839604
1fe0: 00000000 7e8394a8 0006db30 0006db58
 r7:00000197 r6:00000000 r5:00000000 r4:00000000
Rebooting in 86400 seconds..