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WARNING: CPU: 1 PID: 53 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: 53 Comm: kworker/u4:2 Not tainted 5.12.0-syzkaller #0
Hardware name: ARM-Versatile Express
Workqueue: gid-cache-wq netdevice_event_work_handler
Backtrace: 
[<8180501c>] (dump_backtrace) from [<81805290>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
 r7:00000080 r6:60000193 r5:00000000 r4:82b58784
[<81805278>] (show_stack) from [<8180c988>] (__dump_stack lib/dump_stack.c:79 [inline])
[<81805278>] (show_stack) from [<8180c988>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<8180c8d0>] (dump_stack) from [<81805e24>] (panic+0x130/0x378 kernel/panic.c:231)
 r7:81f4a020 r6:82a39124 r5:00000000 r4:82c6f0d8
[<81805cf4>] (panic) from [<802447a4>] (__warn+0xb0/0x164 kernel/panic.c:605)
 r3:82a2248c r2:00000000 r1:5b736000 r0:81f4a020
 r7:00000015
[<802446f4>] (__warn) from [<818060d4>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
 r7:809f48ac r6:00000015 r5:81fcc53c r4:00000000
[<81806070>] (warn_slowpath_fmt) from [<809f48ac>] (vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21)
 r8:00fe4c00 r7:84538720 r6:82a22498 r5:00000000 r4:84539390
[<809f475c>] (vkms_vblank_simulate) from [<80309a14>] (__run_hrtimer kernel/time/hrtimer.c:1537 [inline])
[<809f475c>] (vkms_vblank_simulate) from [<80309a14>] (__hrtimer_run_queues+0xd4/0x690 kernel/time/hrtimer.c:1601)
 r9:83650000 r8:ddfdb3e0 r7:ddfdb380 r6:82a22498 r5:00000000 r4:84539390
[<80309940>] (__hrtimer_run_queues) from [<8030a8f8>] (hrtimer_interrupt+0x14c/0x2e0 kernel/time/hrtimer.c:1663)
 r10:ddfdb4d8 r9:ddfdb498 r8:ddfdb458 r7:ddfdb4a0 r6:ddfdb4e0 r5:20000193
 r4:ddfdb380
[<8030a7ac>] (hrtimer_interrupt) from [<8114b618>] (timer_handler drivers/clocksource/arm_arch_timer.c:656 [inline])
[<8030a7ac>] (hrtimer_interrupt) from [<8114b618>] (arch_timer_handler_virt+0x30/0x38 drivers/clocksource/arm_arch_timer.c:667)
 r10:83651e00 r9:83651e68 r8:83651dd0 r7:8348d940 r6:82a22c34 r5:0000001c
 r4:8348b000
[<8114b5e8>] (arch_timer_handler_virt) from [<802e14a8>] (handle_percpu_devid_irq+0xa4/0x19c kernel/irq/chip.c:930)
[<802e1404>] (handle_percpu_devid_irq) from [<802da238>] (generic_handle_irq_desc include/linux/irqdesc.h:158 [inline])
[<802e1404>] (handle_percpu_devid_irq) from [<802da238>] (generic_handle_irq kernel/irq/irqdesc.c:652 [inline])
[<802e1404>] (handle_percpu_devid_irq) from [<802da238>] (__handle_domain_irq+0xb0/0x120 kernel/irq/irqdesc.c:689)
 r10:83651e00 r9:83651e68 r8:00000001 r7:00000000 r6:828ab498 r5:00000000
 r4:828ab498 r3:00010000
[<802da188>] (__handle_domain_irq) from [<80891484>] (handle_domain_irq include/linux/irqdesc.h:176 [inline])
[<802da188>] (__handle_domain_irq) from [<80891484>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370)
 r10:00000088 r9:83650000 r8:e000200c r7:828ab4bc r6:e0002000 r5:83651e68
 r4:82a22c34
[<80891400>] (gic_handle_irq) from [<80200afc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x83651e68 to 0x83651eb0)
1e60:                   835e3181 5b736000 0000001e 00000193 84068b00 84068b00
1e80: 83651eb8 84068b30 00000113 82a22498 00000088 83651edc 00000000 83651eb8
1ea0: 83650000 810aaf6c 00000113 ffffffff
 r9:83650000 r8:00000113 r7:83651e9c r6:ffffffff r5:00000113 r4:810aaf6c
[<810aaed4>] (netdevice_event_work_handler) from [<802697fc>] (process_one_work+0x2d4/0x998 kernel/workqueue.c:2275)
 r9:82a22498 r8:82c015f2 r7:8374f400 r6:83420000 r5:8353e300 r4:84068b00
[<80269528>] (process_one_work) from [<80269f24>] (worker_thread+0x64/0x54c kernel/workqueue.c:2421)
 r10:00000088 r9:83650000 r8:82a06d00 r7:83420038 r6:8353e314 r5:83420000
 r4:8353e300
[<80269ec0>] (worker_thread) from [<80272084>] (kthread+0x184/0x1a4 kernel/kthread.c:292)
 r10:835d3e64 r9:8353e300 r8:80269ec0 r7:00000000 r6:83650000 r5:8354c340
 r4:8353e380
[<80271f00>] (kthread) from [<80200118>] (ret_from_fork+0x14/0x3c arch/arm/kernel/entry-common.S:158)
Exception stack(0x83651fb0 to 0x83651ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271f00
 r4:8354c340
Rebooting in 86400 seconds..