------------[ cut here ]------------
WARNING: CPU: 1 PID: 8946 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: 8946 Comm: syz-executor.0 Not tainted 5.12.0-rc6-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 80 c5 d8 89 e8 8c 09 f0 ff e9 e5 fe ff ff e8 82 15 27 fd <0f> 0b e9 88 fd ff ff e8 86 bf 6a fd e9 11 fe ff ff 4c 89 ef e8 79
RSP: 0018:ffffc90000dc0df0 EFLAGS: 00010046
RAX: 0000000080010000 RBX: ffff8880190a1e58 RCX: 0000000000000000
RDX: ffff88802cee3880 RSI: ffffffff844cdb8e RDI: 0000000000000003
RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff844cd913 R11: 0000000000000000 R12: ffff8880190a0d30
R13: 0000000000fe4c00 R14: ffff8880b9d26340 R15: ffffffff844cd870
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0063) knlGS:0000000009eea380
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080eafc1 CR3: 0000000011820000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:syslog_print_all+0x3dd/0x4a0 kernel/printk/printk.c:1550
Code: 00 45 84 f6 0f 85 8a 00 00 00 e8 4e ff 17 00 48 c7 c7 00 33 f6 8b e8 22 40 a9 07 e8 3d 5a 00 00 e8 48 ee 1d 00 fb 48 8b 3c 24 <e8> 0e 18 5b 00 e8 29 ff 17 00 48 b8 00 00 00 00 00 fc ff df 48 03
RSP: 0018:ffffc9000223fbb0 EFLAGS: 00000202
RAX: 00000000000006ad RBX: 00000000000007c6 RCX: 1ffffffff1b89bc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880231da800
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e058 R11: 0000000000000000 R12: ffffc9000223fc60
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000223fc20
 do_syslog.part.0+0x439/0x7e0 kernel/printk/printk.c:1602
 do_syslog kernel/printk/printk.c:1678 [inline]
 __do_sys_syslog kernel/printk/printk.c:1680 [inline]
 __se_sys_syslog kernel/printk/printk.c:1678 [inline]
 __ia32_sys_syslog+0x9c/0xd0 kernel/printk/printk.c:1678
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x90 arch/x86/entry/common.c:140
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:165
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f75549
Code: 03 74 c0 01 10 05 03 74 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 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffe2fdec EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000ffe2fec4
RDX: 000000000000003f RSI: 00000000080eafd0 RDI: 0000000000000040
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000