------------[ cut here ]------------ WARNING: CPU: 0 PID: 9751 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: 0 UID: 0 PID: 9751 Comm: syz.7.1040 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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 34 b6 29 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3b cb 16 fb cc e8 ba 37 c6 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:ffffc90003b5f6c8 EFLAGS: 00010287 RAX: ffffffff85f975d6 RBX: ffffc90003b5f840 RCX: 0000000000080000 RDX: ffffc9000f435000 RSI: 000000000000181d RDI: 000000000000181e RBP: 1ffff9200076bf08 R08: ffff888026917917 R09: 1ffff11004d22f22 R10: dffffc0000000000 R11: ffffffff85f974a0 R12: 000000587eb81bd9 R13: dffffc0000000000 R14: ffff888024a00028 R15: 000000587eb81bd9 FS: 00007fa927c3e6c0(0000) GS:ffff888125c13000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa926d71880 CR3: 0000000028fbe000 CR4: 0000000000350ef0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline] drm_crtc_next_vblank_start+0x226/0x470 drivers/gpu/drm/drm_vblank.c:1013 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1711 [inline] drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1758 drm_atomic_helper_commit+0x5c7/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2187 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:1103 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1206 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1232 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:238 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:268 [inline] drm_fb_helper_lastclose+0xa4/0x1c0 drivers/gpu/drm/drm_fb_helper.c:1986 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:117 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline] drm_release+0x318/0x3f0 drivers/gpu/drm/drm_file.c:441 __fput+0x44c/0xa70 fs/file_table.c:468 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:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa926d8d710 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44 RSP: 002b:00007fa927c3db70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffea RBX: 0000000000004000 RCX: 00007fa926d8d710 RDX: 0000000000004000 RSI: 00007fa927c3dc10 RDI: 00000000ffffff9c RBP: 00007fa927c3dc10 R08: 0000000000000000 R09: 0023647261632f69 R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd R13: 00007fa926fe6308 R14: 00007fa926fe6270 R15: 00007ffea5ba9998