------------[ cut here ]------------
WARNING: CPU: 0 PID: 5162 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: 5162 Comm: syz-executor.1 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 r7:83cb4720 r6:82a22498 r5:00000000 r4:83cb5390
[<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)
 r9:86d92000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:83cb5390
[<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)
 r10:86d93c60 r9:86d93cc8 r8:86d93c30 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)
 r10:86d93c60 r9:86d93cc8 r8:00000001 r7:00000000 r6:828ad498 r5:00000000
 r4:828ad498 r3:00010001
[<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)
 r10:832feb4c r9:86d92000 r8:e000200c r7:828ad4bc r6:e0002000 r5:86d93cc8
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86d93cc8 to 0x86d93d10)
3cc0:                   00000000 821137b8 00000001 20000093 20000013 8339cf30
3ce0: 86c6445c 82a22bf0 81a03bb8 8339cf30 832feb4c 86d93d2c 86d93cc0 86d93d18
3d00: 8181dacc 81826b50 20000013 ffffffff
 r9:86d92000 r8:81a03bb8 r7:86d93cfc r6:ffffffff r5:20000013 r4:81826b50
[<81826b10>] (_raw_spin_unlock_irqrestore) from [<80808b94>] (debug_object_activate+0x180/0x23c lib/debugobjects.c:684)
 r5:00000000 r4:86afcb28
[<80808a14>] (debug_object_activate) from [<80808c40>] (debug_object_activate+0x22c/0x23c lib/debugobjects.c:702)
 r10:832feb4c r9:8339cf30 r8:81a03bb8 r7:82a22bf0 r6:86c6445c r5:00000000
 r4:00000000
[<80808a14>] (debug_object_activate) from [<802f19f8>] (debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline])
[<80808a14>] (debug_object_activate) from [<802f19f8>] (__call_rcu kernel/rcu/tree.c:3023 [inline])
[<80808a14>] (debug_object_activate) from [<802f19f8>] (call_rcu+0x30/0x49c kernel/rcu/tree.c:3114)
 r10:82bfe0f8 r9:0000000b r8:00000000 r7:86da6b00 r6:8145e22c r5:86c6445c
 r4:86c64000
[<802f19c8>] (call_rcu) from [<81462e90>] (netlink_release+0x530/0xb48 net/netlink/af_netlink.c:810)
 r10:82bfe0f8 r9:0000000b r8:00000000 r7:86da6b00 r6:86c64000 r5:833d6a0c
 r4:86c64000
[<81462960>] (netlink_release) from [<81321264>] (__sock_release+0x48/0xc0 net/socket.c:599)
 r10:5ac3c35a r9:86c0d734 r8:85cc9e40 r7:834a2550 r6:00000000 r5:8650d17c
 r4:8650d040
[<8132121c>] (__sock_release) from [<813212f4>] (sock_close+0x18/0x20 net/socket.c:1258)
 r7:834a2550 r6:002e0003 r5:8650d0c0 r4:858a23c0
[<813212dc>] (sock_close) from [<804dc2e0>] (__fput+0x9c/0x264 fs/file_table.c:280)
[<804dc244>] (__fput) from [<804dc524>] (____fput+0x10/0x14 fs/file_table.c:313)
 r9:86c0d734 r8:81f4a770 r7:82c6ba40 r6:86c0d140 r5:86c0d6e4 r4:00000000
[<804dc514>] (____fput) from [<80270030>] (task_work_run+0xa0/0xdc kernel/task_work.c:140)
[<8026ff90>] (task_work_run) from [<8020ce3c>] (tracehook_notify_resume include/linux/tracehook.h:189 [inline])
[<8026ff90>] (task_work_run) from [<8020ce3c>] (do_work_pending+0x520/0x648 arch/arm/kernel/signal.c:672)
 r9:81f42a14 r8:fffffe30 r7:86d92000 r6:80200224 r5:86d93fb0 r4:ffffe000
[<8020c91c>] (do_work_pending) from [<80200098>] (slow_work_pending+0xc/0x20)
Exception stack(0x86d93fb0 to 0x86d93ff8)
3fa0:                                     00000000 00000002 00000000 00000003
3fc0: ffffffff 76f7db90 00120120 00000006 7eddb31a 76f7d6d0 7eddb4a4 76f7d20c
3fe0: 0000001c 76f7bff0 00028e6c 00029328 80000010 00000003
 r10:00000006 r9:86d92000 r8:80200224 r7:00000006 r6:00120120 r5:76f7db90
 r4:ffffffff
Rebooting in 86400 seconds..