------------[ cut here ]------------
WARNING: CPU: 1 PID: 14841 at drivers/gpu/drm/vkms/vkms_crtc.c:98 vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:98
Modules linked in:
CPU: 1 UID: 0 PID: 14841 Comm: syz.2.2325 Not tainted 6.13.0-rc2-syzkaller-00292-ga446e965a188 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:98
Code: 42 80 3c 30 00 74 08 48 89 ef e8 98 b2 0e fc 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 6e da aa fb 90 <0f> 0b 90 eb e4 89 d9 80 e1 07 38 c1 0f 8c cd fe ff ff 48 89 df e8
RSP: 0018:ffffc9000e59ece8 EFLAGS: 00010287
RAX: ffffffff85f48382 RBX: 000000ba0ba9fe18 RCX: 0000000000080000
RDX: ffffc9000bcf9000 RSI: 00000000000062c5 RDI: 00000000000062c6
RBP: ffffc9000e59ee80 R08: ffffffff85f482ef R09: 1ffffffff284dd1a
R10: dffffc0000000000 R11: ffffffff85f48200 R12: 000000ba0ba9fe18
R13: ffff8880252f8150 R14: 1ffff92001cb3dd0 R15: ffff8880250b4000
FS:  00007f51b8dfe6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f04222a56c0 CR3: 000000005d6ee000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 00000000872c9164 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline]
 drm_crtc_next_vblank_start+0x229/0x490 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline]
 drm_atomic_helper_wait_for_fences+0x277/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1605
 commit_tail+0x75/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1819
 drm_atomic_helper_commit+0x953/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2073
 drm_atomic_commit+0x294/0x2f0 drivers/gpu/drm/drm_atomic.c:1518
 drm_client_modeset_commit_atomic+0x670/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1070
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1173
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1377 [inline]
 drm_fb_helper_pan_display+0x379/0xc10 drivers/gpu/drm/drm_fb_helper.c:1437
 fb_pan_display+0x3a3/0x680 drivers/video/fbdev/core/fbmem.c:191
 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:381
 fbcon_switch+0x144b/0x2250 drivers/video/fbdev/core/fbcon.c:2186
 flush_scrollback drivers/tty/vt/vt.c:901 [inline]
 csi_J+0x6f8/0xeb0 drivers/tty/vt/vt.c:1516
 do_con_trol drivers/tty/vt/vt.c:2657 [inline]
 do_con_write+0x3b5b/0x4c30 drivers/tty/vt/vt.c:3092
 con_write+0x26/0x40 drivers/tty/vt/vt.c:3434
 process_output_block drivers/tty/n_tty.c:574 [inline]
 n_tty_write+0xd62/0x1230 drivers/tty/n_tty.c:2389
 iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
 file_tty_write+0x546/0x9b0 drivers/tty/tty_io.c:1090
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51b7f85d19
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f51b8dfe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f51b8175fa0 RCX: 00007f51b7f85d19
RDX: 0000000000001006 RSI: 0000000020001040 RDI: 000000000000000f
RBP: 00007f51b8001a20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f51b8175fa0 R15: 00007ffc20e60f38
 </TASK>