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WARNING: CPU: 1 PID: 14118 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: 14118 Comm: udevd 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 r6:60070193 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 r7:8408e720 r6:82a22498 r5:00000000 r4:8408f390
[<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)
 r9:86d66000 r8:ddfdb3e0 r7:ddfdb380 r6:82a22498 r5:00000000 r4:8408f390
[<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 r5:20070193
 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)
 r10:86d67b10 r9:86d67b78 r8:86d67ae0 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)
 r10:86d67b10 r9:86d67b78 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)
 r10:804fc9e8 r9:86d66000 r8:e000200c r7:828ad4bc r6:e0002000 r5:86d67b78
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86d67b78 to 0x86d67bc0)
7b60:                                                       85d2d138 00000000
7b80: 00000002 00000000 00000001 85d2d138 00000000 00000000 00000000 82a22498
7ba0: 804fc9e8 86d67c0c 86d67c10 86d67bc8 802b914c 8181ce80 20070013 ffffffff
 r9:86d66000 r8:00000000 r7:86d67bac r6:ffffffff r5:20070013 r4:8181ce80
[<802b8fbc>] (trace_lock_acquire) from [<802bfef8>] (lock_acquire+0x3c/0x74 kernel/locking/lockdep.c:5481)
 r10:804fc9e8 r9:00000000 r8:00000001 r7:00000000 r6:00000000 r5:00000000
 r4:85d2d138
[<802bfebc>] (lock_acquire) from [<818266ac>] (__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline])
[<802bfebc>] (lock_acquire) from [<818266ac>] (_raw_spin_lock+0x44/0x54 kernel/locking/spinlock.c:151)
 r10:82bfd5e3 r9:ddec0000 r8:86d67e60 r7:85d02cc0 r6:85d2d128 r5:804fc9e8
 r4:85d2d128
[<81826668>] (_raw_spin_lock) from [<804fc9e8>] (spin_lock include/linux/spinlock.h:354 [inline])
[<81826668>] (_raw_spin_lock) from [<804fc9e8>] (__d_lookup+0xd0/0x294 fs/dcache.c:2426)
 r5:beab8a44 r4:85d2d0e0
[<804fc918>] (__d_lookup) from [<804ea7d0>] (lookup_fast+0xc0/0x18c fs/namei.c:1584)
 r10:00000000 r9:2f2f2f2f r8:85d02cc0 r7:86d67cf8 r6:86d67cf4 r5:86d67e58
 r4:86dbd01c
[<804ea710>] (lookup_fast) from [<804eb6e8>] (walk_component+0x40/0x1c4 fs/namei.c:1935)
 r8:d0d0d0d0 r7:86d67e58 r6:00000002 r5:86d67e58 r4:86dbd01c
[<804eb6a8>] (walk_component) from [<804ebad0>] (link_path_walk.part.0+0x264/0x38c fs/namei.c:2266)
 r9:2f2f2f2f r8:d0d0d0d0 r7:86d67e58 r6:fefefeff r5:80808080 r4:86dbd01c
[<804eb86c>] (link_path_walk.part.0) from [<804ec4f4>] (link_path_walk fs/namei.c:2191 [inline])
[<804eb86c>] (link_path_walk.part.0) from [<804ec4f4>] (path_openat+0xc8/0x10f8 fs/namei.c:3494)
 r10:86dbd000 r9:86d66000 r8:858e0c80 r7:86d67e58 r6:00020000 r5:86d67f20
 r4:85d3b240
[<804ec42c>] (path_openat) from [<804ef4ac>] (do_filp_open+0x7c/0x12c fs/namei.c:3525)
 r10:00000142 r9:86d66000 r8:80200224 r7:00000001 r6:86d67f20 r5:86d67e58
 r4:86d67f58
[<804ef430>] (do_filp_open) from [<804d782c>] (do_sys_openat2+0xa8/0x160 fs/open.c:1187)
 r7:ffffff9c r6:0000000b r5:85ac7000 r4:86d67f58
[<804d7784>] (do_sys_openat2) from [<804d7cd0>] (do_sys_open fs/open.c:1203 [inline])
[<804d7784>] (do_sys_openat2) from [<804d7cd0>] (__do_sys_openat fs/open.c:1219 [inline])
[<804d7784>] (do_sys_openat2) from [<804d7cd0>] (sys_openat+0xa4/0xcc fs/open.c:1214)
 r7:00000142 r6:76ed4000 r5:00e88e30 r4:ffffff9c
[<804d7c2c>] (sys_openat) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x86d67fa8 to 0x86d67ff0)
7fa0:                   00e8e128 76f03840 ffffff9c 00e88e30 000a0000 00000000
7fc0: 00e8e128 76f03840 76ed4000 00000142 00000700 76ed4000 7eeea498 0003c200
7fe0: 76ed41a8 7eeea358 76eb8bac 76bcd350
 r5:76f03840 r4:00e8e128
Rebooting in 86400 seconds..