vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
vkms_vblank_simulate: vblank timer overrun
------------[ cut here ]------------
WARNING: CPU: 0 PID: 11492 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 0 PID: 11492 Comm: syz-executor.3 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 00 74 08 48 89 ef e8 6d 69 22 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 3f 19 bf fb 90 <0f> 0b 90 eb e0 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 74 fe ff ff 48
RSP: 0018:ffffc900000079c0 EFLAGS: 00010046
RAX: ffffffff85d5dc11 RBX: 0000005ed98ab2ee RCX: ffff8880513a3c00
RDX: 0000000000000103 RSI: 0000005ed98ab2ee RDI: 0000005ed98ab2ee
RBP: ffffc90000007a90 R08: ffffffff85d5db79 R09: fffff52000000f40
R10: dffffc0000000000 R11: ffffffff85d5da40 R12: 0000005ed98ab2ee
R13: 1ffff92000000f52 R14: 0000000000000000 R15: ffff88801fa90000
FS:  00007f35493ab6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000007f094000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:867 [inline]
 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:886 [inline]
 drm_update_vblank_count+0x25a/0x9c0 drivers/gpu/drm/drm_vblank.c:298
 drm_vblank_disable_and_save+0xee/0x3b0 drivers/gpu/drm/drm_vblank.c:467
 vblank_disable_fn+0x138/0x1b0 drivers/gpu/drm/drm_vblank.c:485
 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers kernel/time/timer.c:2408 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2419
 run_timer_base kernel/time/timer.c:2428 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2438
 __do_softirq+0x2bc/0x943 kernel/softirq.c:554
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0xaad/0xfd0 kernel/printk/printk.c:2979
Code: ff ff e8 86 6e 1f 00 90 0f 0b 90 e9 d8 f8 ff ff e8 78 6e 1f 00 e8 03 ad fe 09 4d 85 f6 74 b6 e8 69 6e 1f 00 fb 48 8b 44 24 70 <42> 0f b6 04 38 84 c0 48 8b 7c 24 30 0f 85 22 02 00 00 0f b6 1f 31
RSP: 0018:ffffc900037fee20 EFLAGS: 00000246
RAX: 1ffff920006ffe10 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000a763000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc900037fefd0 R08: ffffffff81758684 R09: 1ffffffff259c2a0
R10: dffffc0000000000 R11: fffffbfff259c2a1 R12: ffffffff8e8f8778
R13: ffffffff8e8f8720 R14: 0000000000000200 R15: dffffc0000000000
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3042
 vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2342
 _printk+0xd5/0x120 kernel/printk/printk.c:2367
 xt_ct_set_helper net/netfilter/xt_CT.c:82 [inline]
 xt_ct_tg_check+0xac9/0xdf0 net/netfilter/xt_CT.c:203
 xt_ct_tg_check_v0+0x1e4/0x3f0 net/netfilter/xt_CT.c:250
 xt_check_target+0x3b9/0xa40 net/netfilter/x_tables.c:1038
 check_target net/ipv4/netfilter/ip_tables.c:510 [inline]
 find_check_entry net/ipv4/netfilter/ip_tables.c:552 [inline]
 translate_table+0x19b3/0x2260 net/ipv4/netfilter/ip_tables.c:716
 do_replace net/ipv4/netfilter/ip_tables.c:1133 [inline]
 do_ipt_set_ctl+0x27d2/0x3dd0 net/ipv4/netfilter/ip_tables.c:1627
 nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101
 do_sock_setsockopt+0x3af/0x720 net/socket.c:2311
 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f354867de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f35493ab0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f35487abf80 RCX: 00007f354867de69
RDX: 0000000000000040 RSI: 8001000000000000 RDI: 0000000000000004
RBP: 00007f35486ca47a R08: 0000000000000240 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f35487abf80 R15: 00007f35488cfa48
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	e8 86 6e 1f 00       	call   0x1f6e8b
   5:	90                   	nop
   6:	0f 0b                	ud2
   8:	90                   	nop
   9:	e9 d8 f8 ff ff       	jmp    0xfffff8e6
   e:	e8 78 6e 1f 00       	call   0x1f6e8b
  13:	e8 03 ad fe 09       	call   0x9fead1b
  18:	4d 85 f6             	test   %r14,%r14
  1b:	74 b6                	je     0xffffffd3
  1d:	e8 69 6e 1f 00       	call   0x1f6e8b
  22:	fb                   	sti
  23:	48 8b 44 24 70       	mov    0x70(%rsp),%rax
* 28:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	48 8b 7c 24 30       	mov    0x30(%rsp),%rdi
  34:	0f 85 22 02 00 00    	jne    0x25c
  3a:	0f b6 1f             	movzbl (%rdi),%ebx
  3d:	31                   	.byte 0x31