------------[ cut here ]------------
WARNING: CPU: 1 PID: 9759 at drivers/gpu/drm/vkms/vkms_crtc.c:21 vkms_vblank_simulate+0x31e/0x3b0 drivers/gpu/drm/vkms/vkms_crtc.c:21
Modules linked in:
CPU: 1 PID: 9759 Comm: syz-executor.1 Not tainted 5.10.0-rc1-next-20201029-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:vkms_vblank_simulate+0x31e/0x3b0 drivers/gpu/drm/vkms/vkms_crtc.c:21
Code: 85 9e 00 00 00 48 8b 95 b8 01 00 00 4c 89 e1 bf 02 00 00 00 48 c7 c6 20 e6 b3 89 e8 0c 91 ef ff e9 e5 fe ff ff e8 72 e0 34 fd <0f> 0b e9 88 fd ff ff e8 e6 7b 76 fd e9 11 fe ff ff 4c 89 ef e8 d9
RSP: 0018:ffffc90000d90dc0 EFLAGS: 00010046
RAX: 0000000000010001 RBX: ffff88814384de48 RCX: ffffffff843b47c3
RDX: ffff888017940000 RSI: ffffffff843b4a3e RDI: 0000000000000007
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88814384cd40
R13: 0000000000fe4c00 R14: ffffffff843b4720 R15: dffffc0000000000
FS:  000000000230e940(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000768008 CR3: 000000003e500000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:4783
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 92 a0 64 f8 e8 bd 37 8f f8 fb bf 01 00 00 00 <e8> 92 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 00 89 64
RSP: 0018:ffffc9000178fb08 EFLAGS: 00000202
RAX: 00000000000004d9 RBX: ffff888017940000 RCX: 1ffffffff19d9421
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed1002f28000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:636
RIP: 0010:syslog_print_all+0x3dd/0x4a0 kernel/printk/printk.c:1578
Code: 00 45 84 f6 0f 85 8a 00 00 00 e8 de 96 17 00 48 c7 c7 00 92 32 8b e8 c2 02 8f 07 e8 fd 54 00 00 e8 68 61 1d 00 fb 48 8b 3c 24 <e8> 7e a1 58 00 e8 b9 96 17 00 48 b8 00 00 00 00 00 fc ff df 48 03
RSP: 0018:ffffc9000178fbd0 EFLAGS: 00000206
RAX: 00000000000004d7 RBX: 00000000000008f6 RCX: 1ffffffff19d9421
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801b163000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000037303354 R12: ffffc9000178fc80
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000178fc40
 do_syslog.part.0+0x3c5/0x7c0 kernel/printk/printk.c:1629
 do_syslog kernel/printk/printk.c:1701 [inline]
 __do_sys_syslog kernel/printk/printk.c:1703 [inline]
 __se_sys_syslog kernel/printk/printk.c:1701 [inline]
 __x64_sys_syslog+0x97/0xc0 kernel/printk/printk.c:1701
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffb17724c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007fffb17725b0 RCX: 000000000045deb9
RDX: 000000000000003f RSI: 00007fffb17725b0 RDI: 0000000000000003
RBP: 0000000000748018 R08: 0000000000000006 R09: 0000006e0000005b
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000419720
R13: 00007fffb1772768 R14: 0000000000000000 R15: 0000000000000000