------------[ cut here ]------------
WARNING: CPU: 0 PID: 2138 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: 2138 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 r7:837ac720 r6:82a22498 r5:00000000 r4:837ad390
[<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)
 r9:86df6000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:837ad390
[<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)
 r10:86df7b30 r9:86df7b98 r8:86df7b00 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)
 r10:86df7b30 r9:86df7b98 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)
 r10:83635140 r9:86df6000 r8:e000200c r7:828ad4bc r6:e0002000 r5:86df7b98
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86df7b98 to 0x86df7be0)
7b80:                                                       00000000 821137b8
7ba0: 00000001 000001c1 ddfcd180 00000000 855fa080 82a22928 00000001 8181f7ec
7bc0: 83635140 86df7bfc 86df7b90 86df7be8 8181dacc 81826adc 20000013 ffffffff
 r9:86df6000 r8:00000001 r7:86df7bcc 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: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)
 r10:835e1320 r9:83659080 r8:00000000 r7:ddfcd190 r6:83635140 r5:856c0000
 r4:ddfcd180
[<8181f408>] (__schedule) from [<818202bc>] (preempt_schedule_common+0x3c/0xac kernel/sched/core.c:5233)
 r10:04200000 r9:fd62bfdf r8:86df7ddc r7:81820360 r6:00000001 r5:81820360
 r4:86df6000
[<81820280>] (preempt_schedule_common) from [<81820360>] (preempt_schedule+0x34/0x38 kernel/sched/core.c:5258)
 r7:00034000 r6:8365a100 r5:00000004 r4:86df6000
[<8182032c>] (preempt_schedule) from [<80470378>] (__kunmap_atomic include/linux/highmem-internal.h:114 [inline])
[<8182032c>] (preempt_schedule) from [<80470378>] (zap_pte_range mm/memory.c:1326 [inline])
[<8182032c>] (preempt_schedule) from [<80470378>] (zap_pmd_range mm/memory.c:1374 [inline])
[<8182032c>] (preempt_schedule) from [<80470378>] (zap_pud_range mm/memory.c:1403 [inline])
[<8182032c>] (preempt_schedule) from [<80470378>] (zap_p4d_range mm/memory.c:1424 [inline])
[<8182032c>] (preempt_schedule) from [<80470378>] (unmap_page_range+0x808/0x984 mm/memory.c:1445)
[<8046fb70>] (unmap_page_range) from [<8047085c>] (unmap_single_vma mm/memory.c:1490 [inline])
[<8046fb70>] (unmap_page_range) from [<8047085c>] (unmap_vmas+0x128/0x1d8 mm/memory.c:1522)
 r10:00010000 r9:00000000 r8:86df7ddc r7:00000000 r6:ffffffff r5:000bd000
 r4:870228f0
[<80470734>] (unmap_vmas) from [<8047c250>] (exit_mmap+0xe4/0x1e0 mm/mmap.c:3218)
 r10:00000008 r9:00000000 r8:86df7f58 r7:00000000 r6:81f6b958 r5:8365a100
 r4:870228f0
[<8047c16c>] (exit_mmap) from [<8023ff90>] (__mmput+0x3c/0xfc kernel/fork.c:1090)
 r6:86df6000 r5:83635140 r4:8365a100
[<8023ff54>] (__mmput) from [<802400a8>] (mmput+0x58/0x5c kernel/fork.c:1111)
 r5:83635140 r4:8365a100
[<80240050>] (mmput) from [<8024be58>] (exit_mm kernel/exit.c:501 [inline])
[<80240050>] (mmput) from [<8024be58>] (do_exit+0x404/0xca8 kernel/exit.c:812)
 r5:83635140 r4:8365a100
[<8024ba54>] (do_exit) from [<8024c780>] (do_group_exit+0x48/0xc0 kernel/exit.c:922)
 r7:86df6000
[<8024c738>] (do_group_exit) from [<8025c574>] (get_signal+0x204/0xb28 kernel/signal.c:2773)
 r7:86df6000 r6:400004d8 r5:86e0cd00 r4:00000008
[<8025c370>] (get_signal) from [<8020cc80>] (do_signal arch/arm/kernel/signal.c:619 [inline])
[<8025c370>] (get_signal) from [<8020cc80>] (do_work_pending+0x364/0x648 arch/arm/kernel/signal.c:659)
 r10:0004b8ac r9:81f42a14 r8:fffffe30 r7:fffffe00 r6:86df7f44 r5:86df7fb0
 r4:ffffe000
[<8020c91c>] (do_work_pending) from [<80200098>] (slow_work_pending+0xc/0x20)
Exception stack(0x86df7fb0 to 0x86df7ff8)
7fa0:                                     001200a8 00000080 00000000 00000000
7fc0: 00000000 00000000 00000000 000000f0 7ed8632a 76ff46d0 7ed864b4 76ff420c
7fe0: 76ff40b8 76ff40a8 0001d7c0 0004b8ac 60000010 001200a8
 r10:000000f0 r9:86df6000 r8:80200224 r7:000000f0 r6:00000000 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..