------------[ cut here ]------------
WARNING: CPU: 0 PID: 4293 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: 4293 Comm: syz-executor.1 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 r7:83496720 r6:82a22498 r5:00000000 r4:83497390
[<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)
 r9:86c92000 r8:ddfc53e0 r7:ddfc5380 r6:82a22498 r5:00000000 r4:83497390
[<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)
 r10:86c93d58 r9:86c93dc0 r8:86c93d28 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)
 r10:86c93d58 r9:86c93dc0 r8:00000001 r7:00000000 r6:828ad498 r5:00000000
 r4:828ad498 r3:00010000
[<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)
 r10:805a5024 r9:40000193 r8:e000200c r7:828ad4bc r6:e0002000 r5:86c93dc0
 r4:82a22c34
[<8088aeec>] (gic_handle_irq) from [<80200abc>] (__irq_svc+0x5c/0x94 arch/arm/kernel/entry-armv.S:205)
Exception stack(0x86c93dc0 to 0x86c93e08)
3dc0: 00000000 821137b8 00000001 20000093 82b58344 00000000 20000013 00000000
3de0: 76fc0090 86c93e97 805a5024 86c93e2c 86c93db8 86c93e10 8181dacc 81809ec4
3e00: 20000013 ffffffff
 r9:86c92000 r8:76fc0090 r7:86c93df4 r6:ffffffff r5:20000013 r4:81809ec4
[<81809de0>] (dump_stack) from [<80857268>] (fail_dump lib/fault-inject.c:52 [inline])
[<81809de0>] (dump_stack) from [<80857268>] (should_fail+0x194/0x1f4 lib/fault-inject.c:146)
 r7:00000000 r6:00000000 r5:86c93f68 r4:82b58150
[<808570d4>] (should_fail) from [<808572e4>] (should_fail_usercopy+0x1c/0x20 lib/fault-inject-usercopy.c:37)
 r5:86c93f68 r4:00000002
[<808572c8>] (should_fail_usercopy) from [<805140bc>] (_copy_to_user include/linux/uaccess.h:175 [inline])
[<808572c8>] (should_fail_usercopy) from [<805140bc>] (copy_to_user include/linux/uaccess.h:200 [inline])
[<808572c8>] (should_fail_usercopy) from [<805140bc>] (simple_read_from_buffer+0x9c/0x13c fs/libfs.c:731)
[<80514020>] (simple_read_from_buffer) from [<805a50cc>] (proc_fail_nth_read+0xa8/0xf4 fs/proc/base.c:1422)
 r9:86c93f68 r8:86c93f68 r7:0000000f r6:76fc0090 r5:00000002 r4:86ceb0c0
[<805a5024>] (proc_fail_nth_read) from [<804da5ac>] (vfs_read+0xbc/0x33c fs/read_write.c:494)
 r8:76fc0090 r7:ffffe000 r6:8556f3c0 r5:00000000 r4:0000000f
[<804da4f0>] (vfs_read) from [<804dabe4>] (ksys_read+0x68/0xec fs/read_write.c:634)
 r10:00000003 r9:86c92000 r8:80200224 r7:00000000 r6:00000000 r5:8556f3c0
 r4:8556f3c3
[<804dab7c>] (ksys_read) from [<804dac78>] (__do_sys_read fs/read_write.c:644 [inline])
[<804dab7c>] (ksys_read) from [<804dac78>] (sys_read+0x10/0x14 fs/read_write.c:642)
 r7:00000003 r6:0000000f r5:76fc0b90 r4:00000004
[<804dac68>] (sys_read) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64)
Exception stack(0x86c93fa8 to 0x86c93ff0)
3fa0:                   00000004 76fc0b90 00000004 76fc0090 0000000f 00000000
3fc0: 00000004 76fc0b90 0000000f 00000003 7ef5731a 76fc06d0 7ef574a4 76fc020c
3fe0: 76fc0048 76fc0030 00028d7c 0002918c
Rebooting in 86400 seconds..