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: 1 PID: 44 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: 1 PID: 44 Comm: kworker/1:1 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: usb_hub_wq hub_event
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:ffffc90000a089c0 EFLAGS: 00010046
RAX: ffffffff85d5dc11 RBX: 00000081c69e70bb RCX: ffff88801b698000
RDX: 0000000000000103 RSI: 00000081c69e70bb RDI: 00000081c69e70bb
RBP: ffffc90000a08a90 R08: ffffffff85d5db79 R09: fffff52000141140
R10: dffffc0000000000 R11: ffffffff85d5da40 R12: 00000081c69e70bb
R13: 1ffff92000141152 R14: 0000000000000000 R15: ffff88801f578000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4e8a5d71a0 CR3: 000000007964a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000000f7db5b33
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:ffffc90000b46c00 EFLAGS: 00000246
RAX: 1ffff92000168dcc RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc900125f7000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90000b46db0 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
 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4864
 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4875
 _dev_err+0x122/0x170 drivers/base/core.c:4930
 usb_generic_driver_probe+0xff/0x140 drivers/usb/core/generic.c:256
 usb_probe_device+0x13e/0x2d0 drivers/usb/core/driver.c:294
 really_probe+0x29e/0xc50 drivers/base/dd.c:658
 __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800
 driver_probe_device+0x50/0x430 drivers/base/dd.c:830
 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958
 bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:457
 __device_attach+0x333/0x520 drivers/base/dd.c:1030
 bus_probe_device+0x189/0x260 drivers/base/bus.c:532
 device_add+0x8ff/0xca0 drivers/base/core.c:3639
 usb_new_device+0x104a/0x19a0 drivers/usb/core/hub.c:2614
 hub_port_connect drivers/usb/core/hub.c:5483 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5623 [inline]
 port_event drivers/usb/core/hub.c:5783 [inline]
 hub_event+0x2d13/0x50f0 drivers/usb/core/hub.c:5865
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </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