------------[ cut here ]------------
WARNING: CPU: 1 PID: 9520 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: 9520 Comm: syz-executor.0 Not tainted 5.11.0-rc5-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 c0 8c b5 89 e8 bc f5 ef ff e9 e5 fe ff ff e8 f2 c5 2d fd <0f> 0b e9 88 fd ff ff e8 96 85 70 fd e9 11 fe ff ff 4c 89 ef e8 89
RSP: 0018:ffffc90000db0de8 EFLAGS: 00010046
RAX: 0000000080010000 RBX: ffff8880192b9e48 RCX: 0000000000000000
RDX: ffff88802204d340 RSI: ffffffff8444f5ae RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff8444f333 R11: 0000000000000000 R12: ffff8880192b8d40
R13: 0000000000fe4c00 R14: ffff8880b9f26a00 R15: ffffffff8444f290
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0063) knlGS:0000000009a35900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000818800c CR3: 0000000022ffc000 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+0x609/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:syslog_print_all+0x3dd/0x4a0 kernel/printk/printk.c:1549
Code: 00 45 84 f6 0f 85 8a 00 00 00 e8 fe b0 17 00 48 c7 c7 00 2f 36 8b e8 32 29 a1 07 e8 cd 56 00 00 e8 68 83 1d 00 fb 48 8b 3c 24 <e8> 3e e7 59 00 e8 d9 b0 17 00 48 b8 00 00 00 00 00 fc ff df 48 03
RSP: 0018:ffffc90001fafbb0 EFLAGS: 00000202
RAX: 0000000000000675 RBX: 0000000000000870 RCX: 1ffffffff1a06971
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880248b7000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81788e58 R11: 0000000000000000 R12: ffffc90001fafc60
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90001fafc20
 do_syslog.part.0+0x3c5/0x7c0 kernel/printk/printk.c:1600
 do_syslog kernel/printk/printk.c:1672 [inline]
 __do_sys_syslog kernel/printk/printk.c:1674 [inline]
 __se_sys_syslog kernel/printk/printk.c:1672 [inline]
 __ia32_sys_syslog+0x9c/0xd0 kernel/printk/printk.c:1672
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f11549
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000fffd364c EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000fffd379c
RDX: 000000000000003f RSI: 00000000080da24e RDI: 0000000000000040
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000