------------[ cut here ]------------
WARNING: CPU: 1 PID: 3263 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: 1 PID: 3263 Comm: syz-fuzzer 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 r7:844c0720 r6:82a22498 r5:00000000 r4:844c1390
[<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)
 r9:866d6000 r8:ddfdb3e0 r7:ddfdb380 r6:82a22498 r5:00000000 r4:844c1390
[<80307de8>] (__hrtimer_run_queues) from [<80308da0>] (hrtimer_interrupt+0x14c/0x2e0 kernel/time/hrtimer.c:1663)
 r10:ddfdb4d8 r9:ddfdb498 r8:ddfdb458 r7:ddfdb4a0 r6:ddfdb4e0 r5:20000193
 r4:ddfdb380
[<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)
 r10:866d7d90 r9:866d7df8 r8:866d7d60 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)
 r10:866d7d90 r9:866d7df8 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)
 r10:837230c0 r9:866d6000 r8:e000200c r7:828ad4bc r6:e0002000 r5:866d7df8
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x866d7df8 to 0x866d7e40)
7de0:                                                       00000001 821137b8
7e00: 00000001 002a53db ddfe3180 00000000 866be180 82a22928 00000001 8181f7ec
7e20: 837230c0 866d7e5c 866d7df0 866d7e48 8181dacc 81826adc 20000013 ffffffff
 r9:866d6000 r8:00000001 r7:866d7e2c 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)
 r5:00000000 r4:ddfe3180
[<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)
 r10:835f5060 r9:835f4dc0 r8:00000000 r7:ddfcd190 r6:837230c0 r5:855e1040
 r4:ddfcd180
[<8181f408>] (__schedule) from [<8182012c>] (schedule+0x5c/0x108 kernel/sched/core.c:5152)
 r10:5ac3c35a r9:81f42a14 r8:fffffe30 r7:00000002 r6:00000000 r5:866d6000
 r4:837230c0
[<818200d0>] (schedule) from [<8020c9a4>] (do_work_pending+0x88/0x648 arch/arm/kernel/signal.c:653)
 r5:866d7fb0 r4:ffffe000
[<8020c91c>] (do_work_pending) from [<80200098>] (slow_work_pending+0xc/0x20)
Exception stack(0x866d7fb0 to 0x866d7ff8)
7fa0:                                     00000000 00000000 00000020 0bc91be0
7fc0: 00000003 6764c613 00000003 67683453 ffffffe0 0281a080 02800a80 00d4fb10
7fe0: 00000051 02831f8c 00030d08 0003026c 00000010 ffffffff
 r10:02800a80 r9:866d6000 r8:00000000 r7:30c5387d r6:ffffffff r5:00000010
 r4:0003026c
Rebooting in 86400 seconds..