------------[ cut here ]------------ WARNING: CPU: 0 PID: 5287 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x184/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 0 PID: 5287 Comm: syz.4.51 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:vkms_get_vblank_timestamp+0x184/0x1d0 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 e1 7c d3 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 fc 4a 83 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:ffffc90003a07568 EFLAGS: 00010093 RAX: ffffffff84fd94d4 RBX: ffffc90003a07610 RCX: ffff88807c6a3b80 RDX: 0000000000000000 RSI: 0000001b4582fcad RDI: 0000001b4582fcad RBP: 1ffff92000740ec2 R08: 0000000000000004 R09: 0000000000000003 R10: fffff52000740eb0 R11: 1ffff92000740eb0 R12: 0000001b4582fcad R13: dffffc0000000000 R14: ffff88801df7c000 R15: 0000001b4582fcad FS: 000055556a116500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efea63156c0 CR3: 000000005a1d9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:881 [inline] drm_update_vblank_count+0x28b/0x910 drivers/gpu/drm/drm_vblank.c:303 drm_vblank_disable_and_save+0xd6/0x3a0 drivers/gpu/drm/drm_vblank.c:477 drm_crtc_vblank_off+0x217/0x7f0 drivers/gpu/drm/drm_vblank.c:1325 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1255 [inline] drm_atomic_helper_commit_modeset_disables+0xc64/0x18d0 drivers/gpu/drm/drm_atomic_helper.c:1459 vkms_atomic_commit_tail+0x4d/0x200 drivers/gpu/drm/vkms/vkms_drv.c:71 commit_tail+0x27a/0x390 drivers/gpu/drm/drm_atomic_helper.c:1831 drm_atomic_helper_commit+0x6d3/0x730 drivers/gpu/drm/drm_atomic_helper.c:2071 drm_atomic_commit+0x248/0x2a0 drivers/gpu/drm/drm_atomic.c:1452 drm_client_modeset_commit_atomic+0x61d/0x760 drivers/gpu/drm/drm_client_modeset.c:1061 drm_client_modeset_commit_locked+0xc7/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1164 drm_client_modeset_commit+0x46/0x70 drivers/gpu/drm/drm_client_modeset.c:1190 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:253 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:280 [inline] drm_fb_helper_lastclose drivers/gpu/drm/drm_fb_helper.c:2108 [inline] drm_fbdev_client_restore+0xb5/0x150 drivers/gpu/drm/drm_fb_helper.c:2520 drm_client_dev_restore+0x134/0x270 drivers/gpu/drm/drm_client.c:247 drm_lastclose drivers/gpu/drm/drm_file.c:462 [inline] drm_release+0x41a/0x5d0 drivers/gpu/drm/drm_file.c:493 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 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:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc98658f749 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:00007ffe128c0d78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fc9867e7da0 RCX: 00007fc98658f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fc9867e7da0 R08: 0000000000000000 R09: 0000000d128c106f R10: 000000000003fd5c R11: 0000000000000246 R12: 000000000001cc20 R13: 00007fc9867e5fa0 R14: ffffffffffffffff R15: 0000000000000004