------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 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: 1 Comm: swapper/0 Not tainted 5.12.0-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<818044bc>] (dump_backtrace) from [<81804730>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252)
 r7:00000080 r6:60000193 r5:00000000 r4:82b58784
[<81804718>] (show_stack) from [<8180be28>] (__dump_stack lib/dump_stack.c:79 [inline])
[<81804718>] (show_stack) from [<8180be28>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120)
[<8180bd70>] (dump_stack) from [<818052c4>] (panic+0x130/0x378 kernel/panic.c:231)
 r7:81f49ee0 r6:82a39124 r5:00000000 r4:82c6f0d8
[<81805194>] (panic) from [<802447a4>] (__warn+0xb0/0x164 kernel/panic.c:605)
 r3:82a2248c r2:00000000 r1:5b720000 r0:81f49ee0
 r7:00000015
[<802446f4>] (__warn) from [<81805574>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628)
 r7:809f3d4c r6:00000015 r5:81fcc424 r4:00000000
[<81805510>] (warn_slowpath_fmt) from [<809f3d4c>] (vkms_vblank_simulate+0x150/0x154 drivers/gpu/drm/vkms/vkms_crtc.c:21)
 r8:00fe4c00 r7:844b8720 r6:82a22498 r5:00000000 r4:844b9390
[<809f3bfc>] (vkms_vblank_simulate) from [<80309a14>] (__run_hrtimer kernel/time/hrtimer.c:1537 [inline])
[<809f3bfc>] (vkms_vblank_simulate) from [<80309a14>] (__hrtimer_run_queues+0xd4/0x690 kernel/time/hrtimer.c:1601)
 r9:834de000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:844b9390
[<80309940>] (__hrtimer_run_queues) from [<8030a8f8>] (hrtimer_interrupt+0x14c/0x2e0 kernel/time/hrtimer.c:1663)
 r10:ddfc54d8 r9:ddfc5498 r8:ddfc5458 r7:ddfc54a0 r6:ddfc54e0 r5:20000193
 r4:ddfc5380
[<8030a7ac>] (hrtimer_interrupt) from [<8114aab8>] (timer_handler drivers/clocksource/arm_arch_timer.c:656 [inline])
[<8030a7ac>] (hrtimer_interrupt) from [<8114aab8>] (arch_timer_handler_virt+0x30/0x38 drivers/clocksource/arm_arch_timer.c:667)
 r10:834dfbf0 r9:834dfc58 r8:834dfbc0 r7:8348d940 r6:82a22c34 r5:0000001c
 r4:8348b000
[<8114aa88>] (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)
 r10:834dfbf0 r9:834dfc58 r8:00000001 r7:00000000 r6:828ab498 r5:00000000
 r4:828ab498 r3:00010000
[<802da188>] (__handle_domain_irq) from [<80890924>] (handle_domain_irq include/linux/irqdesc.h:176 [inline])
[<802da188>] (__handle_domain_irq) from [<80890924>] (gic_handle_irq+0x84/0xac drivers/irqchip/irq-gic.c:370)
 r10:834000c0 r9:40000193 r8:e000200c r7:828ab4bc r6:e0002000 r5:834dfc58
 r4:82a22c34
[<808908a0>] (gic_handle_irq) from [<80200afc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x834dfc58 to 0x834dfca0)
fc40:                                                       00000000 82115098
fc60: 00000001 0003a1e5 83401240 00000cc0 60000113 ffffffff 82a22be8 00000020
fc80: 834000c0 834dfcd4 834dfc50 834dfca8 8181ffd8 804b3b84 20000113 ffffffff
 r9:834de000 r8:82a22be8 r7:834dfc8c r6:ffffffff r5:20000113 r4:804b3b84
[<804b37d0>] (allocate_slab) from [<804b7198>] (new_slab mm/slub.c:1841 [inline])
[<804b37d0>] (allocate_slab) from [<804b7198>] (new_slab_objects mm/slub.c:2587 [inline])
[<804b37d0>] (allocate_slab) from [<804b7198>] (___slab_alloc.constprop.0+0x398/0x588 mm/slub.c:2750)
 r10:834000c0 r9:83401240 r8:82a22be8 r7:ddfd01b8 r6:60000113 r5:828b01b8
 r4:00000000 r3:003beee0
[<804b6e00>] (___slab_alloc.constprop.0) from [<804b7428>] (__slab_alloc.constprop.0+0xa0/0xbc mm/slub.c:2790)
 r10:00003eb8 r9:802648dc r8:802648dc r7:00000dc0 r6:60000113 r5:828b01b8
 r4:83401240
[<804b7388>] (__slab_alloc.constprop.0) from [<804b7de4>] (slab_alloc_node mm/slub.c:2871 [inline])
[<804b7388>] (__slab_alloc.constprop.0) from [<804b7de4>] (slab_alloc mm/slub.c:2915 [inline])
[<804b7388>] (__slab_alloc.constprop.0) from [<804b7de4>] (kmem_cache_alloc_trace+0x2f8/0x31c mm/slub.c:2932)
 r9:802648dc r8:82a22980 r7:834dfd98 r6:00000dc0 r5:834de000 r4:83401240
[<804b7aec>] (kmem_cache_alloc_trace) from [<802648dc>] (kmalloc include/linux/slab.h:554 [inline])
[<804b7aec>] (kmem_cache_alloc_trace) from [<802648dc>] (kzalloc include/linux/slab.h:684 [inline])
[<804b7aec>] (kmem_cache_alloc_trace) from [<802648dc>] (call_usermodehelper_setup+0x40/0xc4 kernel/umh.c:363)
 r10:835cc000 r9:82b5887c r8:82b5887c r7:82b58884 r6:8349e000 r5:8349e00c
 r4:00000798
[<8026489c>] (call_usermodehelper_setup) from [<8087ad80>] (kobject_uevent_env+0x60c/0x7ec lib/kobject_uevent.c:614)
 r7:00000000 r6:8349e000 r5:00000000 r4:00000798
[<8087a774>] (kobject_uevent_env) from [<8087af74>] (kobject_uevent+0x14/0x18 lib/kobject_uevent.c:642)
 r10:82c6e000 r9:82881874 r8:82881854 r7:00000000 r6:82b76094 r5:849f0e2c
 r4:00000000
[<8087af60>] (kobject_uevent) from [<808799cc>] (kset_register+0x7c/0x90 lib/kobject.c:881)
[<80879950>] (kset_register) from [<80a1419c>] (__class_register+0xd4/0x170 drivers/base/class.c:188)
 r5:00000000 r4:849f0e00
[<80a140c8>] (__class_register) from [<80a18f54>] (transport_class_register+0x18/0x1c drivers/base/transport_class.c:53)
 r7:00000000 r6:82a22498 r5:82c015ac r4:00000000
[<80a18f3c>] (transport_class_register) from [<82837c68>] (sas_transport_init+0x28/0xb8 drivers/scsi/scsi_transport_sas.c:1872)
[<82837c40>] (sas_transport_init) from [<80202478>] (do_one_initcall+0x8c/0x59c init/main.c:1249)
 r5:82c015ac r4:82837c40
[<802023ec>] (do_one_initcall) from [<82801428>] (do_initcall_level init/main.c:1322 [inline])
[<802023ec>] (do_one_initcall) from [<82801428>] (do_initcalls init/main.c:1338 [inline])
[<802023ec>] (do_one_initcall) from [<82801428>] (do_basic_setup init/main.c:1358 [inline])
[<802023ec>] (do_one_initcall) from [<82801428>] (kernel_init_freeable+0x2cc/0x330 init/main.c:1560)
 r9:82881874 r8:82881854 r7:00000374 r6:00000007 r5:83586600 r4:8289ec4c
[<8280115c>] (kernel_init_freeable) from [<81820288>] (kernel_init+0x10/0x120 init/main.c:1447)
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:81820278
 r4:00000000
[<81820278>] (kernel_init) from [<80200118>] (ret_from_fork+0x14/0x3c arch/arm/kernel/entry-common.S:158)
Exception stack(0x834dffb0 to 0x834dfff8)
ffa0:                                     00000000 00000000 00000000 00000000
ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r5:81820278 r4:00000000
Rebooting in 86400 seconds..