------------[ cut here ]------------ WARNING: CPU: 0 PID: 6366 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: 6366 Comm: syz.1.98 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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 2d b8 ab fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 88 49 54 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:ffffc9000485f4a8 EFLAGS: 00010287 RAX: ffffffff85314738 RBX: ffffc9000485f620 RCX: 0000000000080000 RDX: ffffc9000e450000 RSI: 0000000000002d65 RDI: 0000000000002d66 RBP: 1ffff9200090bec4 R08: ffffc9001a202000 R09: 0000000000000000 R10: ffffc9001a202000 R11: 0000000000000000 R12: 0000002874795eb1 R13: dffffc0000000000 R14: ffff888021084000 R15: 0000002874795eb1 FS: 00007f4e272316c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fab7ccb4e9c CR3: 0000000060b0a000 CR4: 00000000003506f0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline] drm_crtc_next_vblank_start+0x21f/0x450 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+0x263/0x8b0 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+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1513 drm_client_modeset_commit_atomic+0x621/0x760 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:466 [inline] drm_release+0x4bd/0x670 drivers/gpu/drm/drm_file.c:497 __fput+0x234/0x970 fs/file_table.c:384 task_work_run+0x1ce/0x250 kernel/task_work.c:239 get_signal+0x1235/0x1400 kernel/signal.c:2678 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 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+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4e2638f749 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:00007f4e27231038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 RAX: fffffffffffffe00 RBX: 00007f4e265e6090 RCX: 00007f4e2638f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a RBP: 00007f4e26413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000078f2a36b R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4e265e6128 R14: 00007f4e265e6090 R15: 00007fff9578d4c8