------------[ cut here ]------------ WARNING: CPU: 0 PID: 8694 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x188/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 0 PID: 8694 Comm: syz.3.710 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:vkms_get_vblank_timestamp+0x188/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 9d 1b 9f fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 d8 de 46 fc <0f> 0b eb ea 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ba fe ff ff 4c RSP: 0018:ffffc900192ef6e8 EFLAGS: 00010293 RAX: ffffffff85404148 RBX: ffffc900192ef860 RCX: ffff8880239c5a00 RDX: 0000000000000000 RSI: 0000005650c375ad RDI: 0000005650c375ad RBP: 1ffff9200325df0c R08: ffffc9000416a000 R09: 0000000000000000 R10: ffffc9000416a000 R11: 0000000000000000 R12: 0000005650c375ad R13: dffffc0000000000 R14: ffff888020f6c000 R15: 0000005650c375ad FS: 000055558156d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3ede76 CR3: 0000000076bbe000 CR4: 00000000003526f0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline] drm_crtc_next_vblank_start+0x22b/0x480 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1583 [inline] drm_atomic_helper_wait_for_fences+0x21b/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1630 drm_atomic_helper_commit+0x5b5/0xae0 drivers/gpu/drm/drm_atomic_helper.c:2059 drm_atomic_commit+0x226/0x280 drivers/gpu/drm/drm_atomic.c:1513 drm_client_modeset_commit_atomic+0x651/0x7b0 drivers/gpu/drm/drm_client_modeset.c:1057 drm_client_modeset_commit_locked+0xcb/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1160 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1186 __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+0x9f/0x150 drivers/gpu/drm/drm_fb_helper.c:2018 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:257 drm_client_dev_restore+0x138/0x270 drivers/gpu/drm/drm_client.c:257 drm_lastclose drivers/gpu/drm/drm_file.c:469 [inline] drm_release+0x4bd/0x670 drivers/gpu/drm/drm_file.c:500 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f382dd9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd8d497c98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f382e017da0 RCX: 00007f382dd9c819 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f382e017da0 R08: 0000000000000006 R09: 0000000000000000 R10: 00007f382e017cb0 R11: 0000000000000246 R12: 000000000005a7cc R13: 00007f382e01618c R14: 000000000005a629 R15: 00007f382e016180