------------[ cut here ]------------
WARNING: CPU: 0 PID: 31412 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: 31412 Comm: syz-executor.4 Not tainted 6.8.0-rc4-syzkaller-00180-g4f5e5092fdbf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 00 74 08 48 89 ef e8 9d 40 28 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 2f 22 c6 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:ffffc900136f77a0 EFLAGS: 00010293
RAX: ffffffff85cd4a11 RBX: 0000028a2917ff37 RCX: ffff88805e7e5940
RDX: 0000000000000000 RSI: 0000028a2917ff37 RDI: 0000028a2917ff37
RBP: ffffc900136f7940 R08: ffffffff85cd4979 R09: 0000000000000000
R10: ffffc90003db2000 R11: ffffffff85cd4840 R12: 0000028a2917ff37
R13: 1ffff920026def28 R14: 0000000000000000 R15: ffff88801fdd0000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0063) knlGS:0000000058294400
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000030f21000 CR3: 000000002278a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:867 [inline]
 drm_crtc_next_vblank_start+0x22d/0x480 drivers/gpu/drm/drm_vblank.c:1002
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1557 [inline]
 drm_atomic_helper_wait_for_fences+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1604
 drm_atomic_helper_commit+0x53a/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2033
 drm_atomic_commit+0x27d/0x2d0 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154
 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1180
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline]
 drm_fb_helper_lastclose+0xbb/0x180 drivers/gpu/drm/drm_fb_helper.c:2005
 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258
 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client.c:247
 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline]
 drm_release+0x47c/0x560 drivers/gpu/drm/drm_file.c:437
 __fput+0x429/0x8a0 fs/file_table.c:376
 __do_sys_close fs/open.c:1554 [inline]
 __se_sys_close fs/open.c:1539 [inline]
 __ia32_sys_close+0x7e/0x110 fs/open.c:1539
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xbd/0x120 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
 entry_SYSENTER_compat_after_hwframe+0x7c/0x86
RIP: 0023:0xf72e4579
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 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f7585ad0 EFLAGS: 00000206 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000058294400
RDX: 0000000000000000 RSI: 00000000f743aff4 RDI: 0000000000000000
RBP: 00000000f72e0000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop