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WARNING: CPU: 1 PID: 3939 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: 3939 Comm: modprobe 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 r7:83d82720 r6:82a22498 r5:00000000 r4:83d83390
[<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)
 r9:86baa000 r8:ddfdb3e0 r7:ddfdb380 r6:82a22498 r5:00000000 r4:83d83390
[<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)
 r10:86babcd8 r9:86babd40 r8:86babca8 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)
 r10:86babcd8 r9:86babd40 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:df7b4570 r9:86baa000 r8:e000200c r7:828ad4bc r6:e0002000 r5:86babd40
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86babd40 to 0x86babd88)
bd40: fffff000 90f00000 76ef40b6 76ef4000 8691bf70 76ef4000 fe91dfdf 04600000
bd60: 835e1b80 76ef4000 df7b4570 86babdac 835e1b80 86babd90 90f00000 80212138
bd80: 00000113 ffffffff
 r9:86baa000 r8:835e1b80 r7:86babd74 r6:ffffffff r5:00000113 r4:80212138
[<802120a0>] (flush_tlb_page) from [<804823fc>] (ptep_clear_flush+0x70/0x74 mm/pgtable-generic.c:97)
[<8048238c>] (ptep_clear_flush) from [<8046e9b4>] (wp_page_copy+0x300/0xb9c mm/memory.c:2908)
 r9:76ef4000 r8:e332d75f r7:00600000 r6:8691bf70 r5:df292870 r4:86babeb8
[<8046e6b4>] (wp_page_copy) from [<80470ec0>] (do_wp_page+0xf0/0x638 mm/memory.c:3160)
 r10:df7ab630 r9:ffffe000 r8:82a32ff8 r7:832c6980 r6:8691bf70 r5:86babeb8
 r4:86baa000
[<80470dd0>] (do_wp_page) from [<80472d88>] (handle_pte_fault mm/memory.c:4336 [inline])
[<80470dd0>] (do_wp_page) from [<80472d88>] (__handle_mm_fault mm/memory.c:4453 [inline])
[<80470dd0>] (do_wp_page) from [<80472d88>] (handle_mm_fault+0x7e8/0x1184 mm/memory.c:4551)
 r6:00000040 r5:76ef4000 r4:00000255
[<804725a0>] (handle_mm_fault) from [<80217c1c>] (__do_page_fault arch/arm/mm/fault.c:228 [inline])
[<804725a0>] (handle_mm_fault) from [<80217c1c>] (do_page_fault+0x11c/0x378 arch/arm/mm/fault.c:296)
 r10:00000255 r9:00000800 r8:835e1bfc r7:835e1b80 r6:00000a0f r5:76ef4f3c
 r4:86babfb0
[<80217b00>] (do_page_fault) from [<80218054>] (do_DataAbort+0x38/0xb8 arch/arm/mm/fault.c:522)
 r10:7ec7b39c r9:76ed5000 r8:80217b00 r7:86babfb0 r6:76ef4f3c r5:00000a0f
 r4:82a330f8
[<8021801c>] (do_DataAbort) from [<80200dc4>] (__dabt_usr+0x44/0x60 arch/arm/kernel/entry-armv.S:421)
Exception stack(0x86babfb0 to 0x86babff8)
bfa0:                                     00000005 76f28110 76ee4400 76ef4f38
bfc0: 76f280f0 6ffffdff 6ffffe35 6ffffeff 6fffff41 76ed5000 7ec7b39c 7ec7b354
bfe0: 6fffffff 7ec7b230 70000022 76efef70 20000010 ffffffff
 r8:30c5387d r7:30c5387d r6:ffffffff r5:20000010 r4:76efef70
Rebooting in 86400 seconds..