------------[ cut here ]------------
WARNING: CPU: 0 PID: 11631 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: 0 PID: 11631 Comm: syz-executor.4 Not tainted 5.12.0-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 80 c5 d8 89 e8 8c 09 f0 ff e9 e5 fe ff ff e8 b2 15 27 fd <0f> 0b e9 88 fd ff ff e8 c6 bf 6a fd e9 11 fe ff ff 4c 89 ef e8 b9
RSP: 0018:ffffc90000007df0 EFLAGS: 00010046
RAX: 0000000000010001 RBX: ffff888143935e58 RCX: 0000000000000000
RDX: ffff88801a5f8000 RSI: ffffffff844cdb9e RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff844cd923 R11: 0000000000000000 R12: ffff888143934d30
R13: 0000000000fe4c00 R14: ffff8880b9c26340 R15: ffffffff844cd880
FS:  0000000002ed6400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000568008 CR3: 000000002575a000 CR4: 00000000001506f0
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:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5530
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 62 e9 49 f8 e8 3d 93 75 f8 fb bf 01 00 00 00 <e8> c2 d0 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 a0 d7 49
RSP: 0018:ffffc9000a1ffb08 EFLAGS: 00000206
RAX: 000000000000072d RBX: ffff88801a5f8000 RCX: 1ffffffff1b89bd1
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed10034bf000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e0a8 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:392 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:384 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:428
 asm_sysvec_reschedule_ipi+0x12/0x20 arch/x86/include/asm/idtentry.h:637
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 32 39 a9 07 e8 3d 5a 00 00 e8 58 ee 1d 00 fb 48 8b 3c 24 <e8> 1e 18 5b 00 e8 29 ff 17 00 48 b8 00 00 00 00 00 fc ff df 48 03
RSP: 0018:ffffc9000a1ffbd0 EFLAGS: 00000206
RAX: 000000000000072b RBX: 0000000000000d1b RCX: 1ffffffff1b89bd1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802af7b800
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8179e0a8 R11: 0000000000000000 R12: ffffc9000a1ffc80
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000a1ffc40
 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]
 __x64_sys_syslog+0x97/0xc0 kernel/printk/printk.c:1678
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe9f3fa5d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007ffe9f3fabf8 RCX: 0000000000466459
RDX: 000000000000003f RSI: 00007ffe9f3fa690 RDI: 0000000000000003
RBP: 00007ffe9f3fa690 R08: 00007ffe9f599090 R09: 00007ffe9f3fa6a0
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000041b650
R13: 0000000000000001 R14: 0000000000540018 R15: 0000000000400538