------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 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: 0 Comm: swapper/1 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
 r7:00000080 r6:60000193 r5:00000000 r4:83966184
[<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline])
[<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<821108c8>] (dump_stack) from [<82108540>] (panic+0x130/0x378 kernel/panic.c:231)
 r7:8293262c r6:8383dd64 r5:00000000 r4:83b620d0
[<82108410>] (panic) from [<80244924>] (__warn+0xb0/0x164 kernel/panic.c:605)
 r3:83822c8c r2:00000000 r1:5a91b000 r0:8293262c
 r7:00000015
[<80244874>] (__warn) from [<821087f0>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
 r7:80aa113c r6:00000015 r5:829c9db8 r4:00000000
[<8210878c>] (warn_slowpath_fmt) from [<80aa113c>] (vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21)
 r8:00fe4c00 r7:84674720 r6:83822c98 r5:00000000 r4:84675390
[<80aa0fec>] (vkms_vblank_simulate) from [<80308164>] (__run_hrtimer kernel/time/hrtimer.c:1519 [inline])
[<80aa0fec>] (vkms_vblank_simulate) from [<80308164>] (__hrtimer_run_queues+0xd4/0x690 kernel/time/hrtimer.c:1583)
 r9:8453c000 r8:ddfdb3e0 r7:ddfdb380 r6:83822c98 r5:00000000 r4:84675390
[<80308090>] (__hrtimer_run_queues) from [<80309074>] (hrtimer_interrupt+0x14c/0x330 kernel/time/hrtimer.c:1645)
 r10:ddfdb4d8 r9:ddfdb498 r8:ddfdb458 r7:ddfdb4a0 r6:ddfdb4e0 r5:20000193
 r4:ddfdb380
[<80308f28>] (hrtimer_interrupt) from [<81650d18>] (timer_handler drivers/clocksource/arm_arch_timer.c:647 [inline])
[<80308f28>] (hrtimer_interrupt) from [<81650d18>] (arch_timer_handler_virt+0x30/0x38 drivers/clocksource/arm_arch_timer.c:658)
 r10:8453ddf8 r9:8453de60 r8:8453ddc8 r7:844a6940 r6:8382343c r5:0000001c
 r4:844a5000
[<81650ce8>] (arch_timer_handler_virt) from [<802dfc04>] (handle_percpu_devid_irq+0xa4/0x19c kernel/irq/chip.c:930)
[<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (generic_handle_irq kernel/irq/irqdesc.c:652 [inline])
[<802dfb60>] (handle_percpu_devid_irq) from [<802d8a30>] (__handle_domain_irq+0xb0/0x120 kernel/irq/irqdesc.c:689)
 r10:8453ddf8 r9:8453de60 r8:00000001 r7:00000000 r6:836c6498 r5:00000000
 r4:836c6498 r3:00010002
[<802d8980>] (__handle_domain_irq) from [<80931750>] (handle_domain_irq include/linux/irqdesc.h:176 [inline])
[<802d8980>] (__handle_domain_irq) from [<80931750>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370)
 r10:84540000 r9:8453c000 r8:e000200c r7:836c64bc r6:e0002000 r5:8453de60
 r4:8382343c
[<809316cc>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x8453de60 to 0x8453dea8)
de60: 00000001 82aed41c 00000001 00003b07 ddfe31c0 00000000 868b9040 83823128
de80: 00000080 82134e84 84540000 8453dec4 8453de58 8453deb0 82133164 8213c174
dea0: 20000113 ffffffff
 r9:8453c000 r8:00000080 r7:8453de94 r6:ffffffff r5:20000113 r4:8213c174
[<8213c148>] (_raw_spin_unlock_irq) from [<8027f5a8>] (finish_lock_switch kernel/sched/core.c:4076 [inline])
[<8213c148>] (_raw_spin_unlock_irq) from [<8027f5a8>] (finish_task_switch+0xac/0x258 kernel/sched/core.c:4193)
 r5:00000000 r4:ddfe31c0
[<8027f4fc>] (finish_task_switch) from [<82134e84>] (context_switch kernel/sched/core.c:4327 [inline])
[<8027f4fc>] (finish_task_switch) from [<82134e84>] (__schedule+0x3e4/0xcc8 kernel/sched/core.c:5075)
 r10:00000000 r9:00000000 r8:00000000 r7:ddfe31d0 r6:84540000 r5:845db0c0
 r4:ddfe31c0
[<82134aa0>] (__schedule) from [<82135d58>] (schedule_idle+0x3c/0x80 kernel/sched/core.c:5182)
 r10:00000000 r9:00000000 r8:00000002 r7:83822cd4 r6:83822c98 r5:00000001
 r4:8453c000
[<82135d1c>] (schedule_idle) from [<8028e104>] (do_idle+0x1f8/0x2f8 kernel/sched/idle.c:328)
 r5:00000001 r4:8453c000
[<8028df0c>] (do_idle) from [<8028e624>] (cpu_startup_entry+0x20/0x24 kernel/sched/idle.c:397)
 r10:00000000 r9:412fc0f1 r8:80003010 r7:8453dff8 r6:83836dc0 r5:83928f70
 r4:00000091
[<8028e604>] (cpu_startup_entry) from [<802118bc>] (secondary_start_kernel+0x1e0/0x2b0 arch/arm/kernel/smp.c:470)
[<802116dc>] (secondary_start_kernel) from [<80201950>] (__enable_mmu+0x0/0x10 arch/arm/kernel/head.S:399)
 r7:8453dff8 r6:30c0387d r5:00000000 r4:844c3300
Dumping ftrace buffer:
   (ftrace buffer empty)
Rebooting in 1 seconds..
Reboot failed -- System halted