------------[ cut here ]------------
WARNING: CPU: 1 PID: 8329 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: 8329 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 r7:83cf4720 r6:82a22498 r5:00000000 r4:83cf5390
[<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)
 r9:86a6e000 r8:ddfdb3e0 r7:ddfdb380 r6:82a22498 r5:00000000 r4:83cf5390
[<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)
 r10:86a6fc58 r9:86a6fcc0 r8:86a6fc28 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)
 r10:86a6fc58 r9:86a6fcc0 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)
 r10:21b17e1e r9:40000193 r8:e000200c r7:828ad4bc r6:e0002000 r5:86a6fcc0
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86a6fcc0 to 0x86a6fd08)
fcc0: 00000001 821137b8 00000001 20000093 20000013 ddfdb380 ddfdb3e0 00000040
fce0: ddfdb3e0 82a22928 21b17e1e 86a6fd24 86a6fcb8 86a6fd10 8181dacc 81826b50
fd00: 20000013 ffffffff
 r9:86a6e000 r8:ddfdb3e0 r7:86a6fcf4 r6:ffffffff r5:20000013 r4:81826b50
[<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 r4:86a6fdd0
[<80308538>] (hrtimer_start_range_ns) from [<80308878>] (hrtimer_start_expires include/linux/hrtimer.h:436 [inline])
[<80308538>] (hrtimer_start_range_ns) from [<80308878>] (hrtimer_sleeper_start_expires+0x34/0x3c kernel/time/hrtimer.c:1817)
 r10:86a6ff60 r9:86a6fe14 r8:86a6e000 r7:835eb940 r6:86a6fdd0 r5:ffffe000
 r4:86a6fe08
[<80308844>] (hrtimer_sleeper_start_expires) from [<803206e8>] (futex_wait_queue_me+0xa4/0x1b4 kernel/futex.c:2593)
[<80320644>] (futex_wait_queue_me) from [<80321b40>] (futex_wait+0xe8/0x220 kernel/futex.c:2708)
 r9:86a6e000 r8:00000000 r7:0012022c r6:00000000 r5:00000000 r4:86a6fdd0
[<80321a58>] (futex_wait) from [<803239b0>] (do_futex+0x148/0xc04 kernel/futex.c:3735)
 r10:0012022c r9:86a6e000 r8:00000000 r7:00000000 r6:00000000 r5:00000000
 r4:7ed1848c
[<80323868>] (do_futex) from [<80324710>] (__do_sys_futex_time32 kernel/futex.c:3988 [inline])
[<80323868>] (do_futex) from [<80324710>] (sys_futex_time32+0x108/0x1a0 kernel/futex.c:3960)
 r10:000000f0 r9:86a6e000 r8:00000000 r7:0012022c r6:00000080 r5:00000000
 r4:7ed1848c
[<80324608>] (sys_futex_time32) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x86a6ffa8 to 0x86a6fff0)
ffa0:                   00000000 00000000 0012022c 00000080 00000000 7ed1848c
ffc0: 00000000 00000000 00000000 000000f0 0012022c 00158af1 00000000 000f4240
ffe0: 7ed18368 7ed18358 0001f4e0 0004ba40
 r8:80200224 r7:000000f0 r6:00000000 r5:00000000 r4:00000000