------------[ cut here ]------------ WARNING: CPU: 1 PID: 14937 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97 Modules linked in: CPU: 1 UID: 0 PID: 14937 Comm: syz.2.4388 Not tainted 6.15.0-syzkaller-08486-gf66bc387efbe #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97 Code: 42 80 3c 28 00 74 08 48 89 df e8 c4 6e 35 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 cb 45 22 fb cc e8 6a 42 d2 fb 90 <0f> 0b 90 eb e3 44 89 e1 80 e1 07 38 c1 0f 8c ff fe ff ff 4c 89 e7 RSP: 0018:ffffc90003247668 EFLAGS: 00010293 RAX: ffffffff85edfb46 RBX: ffffc900032477e0 RCX: ffff88806ec40000 RDX: 0000000000000000 RSI: 0000006bdad0c559 RDI: 0000006bdad0c559 RBP: 1ffff92000648efc R08: ffffffff8fa0a2f7 R09: 1ffffffff1f4145e R10: dffffc0000000000 R11: ffffffff85edfa10 R12: 0000006bdad0c559 R13: dffffc0000000000 R14: ffff888140fd4028 R15: 0000006bdad0c559 FS: 000055556a7de500(0000) GS:ffff888125d63000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3353ee56c0 CR3: 000000005e41b000 CR4: 0000000000350ef0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline] drm_crtc_next_vblank_start+0x226/0x470 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline] drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1643 commit_tail+0x79/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:1857 drm_atomic_helper_commit+0xa6b/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2111 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1101 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1204 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1230 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:237 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:267 [inline] drm_fb_helper_lastclose+0xa4/0x1c0 drivers/gpu/drm/drm_fb_helper.c:1985 drm_fbdev_client_restore+0x34/0x40 drivers/gpu/drm/clients/drm_fbdev_client.c:31 drm_client_dev_restore+0x13c/0x270 drivers/gpu/drm/drm_client_event.c:116 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline] drm_release+0x318/0x3f0 drivers/gpu/drm/drm_file.c:429 __fput+0x44c/0xa70 fs/file_table.c:465 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b97f8e969 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:00007fff4cb6aef8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000071137 RCX: 00007f9b97f8e969 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9b981b7ba0 R08: 0000000000000001 R09: 000000054cb6b1ef R10: 00007f9b97e00000 R11: 0000000000000246 R12: 00007f9b981b5fac R13: 00007f9b981b5fa0 R14: ffffffffffffffff R15: 00007fff4cb6b010