------------[ cut here ]------------ WARNING: CPU: 1 PID: 10054 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1cf/0x240 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 10054 Comm: syz-executor.3 Not tainted 6.4.0-rc4-syzkaller-00078-g929ed21dfdb6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:vkms_get_vblank_timestamp+0x1cf/0x240 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: a7 70 fc e8 c3 b1 60 fc 4c 89 e1 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 65 49 89 04 24 eb c4 e8 a1 a7 70 fc <0f> 0b eb bb e8 48 70 c3 fc e9 de fe ff ff e8 7e 70 c3 fc e9 78 fe RSP: 0018:ffffc900039cf828 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 000000892b69c1eb RCX: 0000000000000000 RDX: ffff888028768000 RSI: ffffffff85139c7f RDI: 0000000000000006 RBP: ffff88801e6b4000 R08: 0000000000000006 R09: 000000892b69c1eb R10: 000000892b69c1eb R11: 0000000000000000 R12: ffffc900039cf990 R13: 000000892b69c1eb R14: 0000000000004e20 R15: ffffffff85139ab0 FS: 000055555598f400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd7ed786058 CR3: 0000000077cdf000 CR4: 0000000000350ee0 Call Trace: drm_crtc_get_last_vbltimestamp+0x102/0x1a0 drivers/gpu/drm/drm_vblank.c:877 drm_crtc_next_vblank_start+0x186/0x300 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1537 [inline] drm_atomic_helper_wait_for_fences+0x1f3/0x840 drivers/gpu/drm/drm_atomic_helper.c:1584 drm_atomic_helper_commit drivers/gpu/drm/drm_atomic_helper.c:2013 [inline] drm_atomic_helper_commit+0x1bd/0x370 drivers/gpu/drm/drm_atomic_helper.c:1985 drm_atomic_commit+0x20a/0x300 drivers/gpu/drm/drm_atomic.c:1503 drm_client_modeset_commit_atomic+0x69b/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1045 drm_client_modeset_commit_locked+0x149/0x580 drivers/gpu/drm/drm_client_modeset.c:1148 drm_client_modeset_commit+0x51/0x80 drivers/gpu/drm/drm_client_modeset.c:1174 __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:230 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline] drm_fb_helper_lastclose+0xc5/0x170 drivers/gpu/drm/drm_fb_helper.c:2361 drm_fbdev_generic_client_restore+0x2c/0x40 drivers/gpu/drm/drm_fbdev_generic.c:260 drm_client_dev_restore+0x188/0x290 drivers/gpu/drm/drm_client.c:236 drm_release+0x40d/0x4f0 drivers/gpu/drm/drm_file.c:493 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f63f0c3e01b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd67d08c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007f63f0c3e01b RDX: 00007f63f0800900 RSI: ffffffffffffffff RDI: 0000000000000005 RBP: 00007f63f0dad980 R08: 0000000000000000 R09: 00007f63f0800000 R10: 00007f63f0800908 R11: 0000000000000293 R12: 000000000008fcec R13: 00007ffd67d08d60 R14: 00007f63f0dabf80 R15: 0000000000000032