------------[ cut here ]------------ WARNING: CPU: 0 PID: 7580 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100 Modules linked in: CPU: 0 UID: 0 PID: 7580 Comm: syz.0.768 Not tainted 6.12.0-rc4-syzkaller-00245-gb423f5a9a61f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100 Code: 42 80 3c 30 00 74 08 48 89 ef e8 38 01 0a fc 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 5e 42 a0 fb 90 <0f> 0b 90 eb e4 89 d9 80 e1 07 38 c1 0f 8c cd fe ff ff 48 89 df e8 RSP: 0018:ffffc90002e0f6c8 EFLAGS: 00010293 RAX: ffffffff85f4a812 RBX: 00000017f0135557 RCX: ffff888027bd1e00 RDX: 0000000000000000 RSI: 00000017f0135557 RDI: 00000017f0135557 RBP: ffffc90002e0f860 R08: ffffffff85f4a77f R09: 0000000000000000 R10: ffffc90003df1000 R11: ffffffff85f4a690 R12: 00000017f0135557 R13: ffff88801efee150 R14: 1ffff920005c1f0c R15: ffff8880258b8000 FS: 000055557a9a1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557286d808 CR3: 00000000335a2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline] drm_crtc_next_vblank_start+0x229/0x490 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline] drm_atomic_helper_wait_for_fences+0x277/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1605 drm_atomic_helper_commit+0x53a/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2034 drm_atomic_commit+0x296/0x2f0 drivers/gpu/drm/drm_atomic.c:1516 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1068 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1171 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1197 __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:264 [inline] drm_fb_helper_lastclose+0xbb/0x180 drivers/gpu/drm/drm_fb_helper.c:2003 drm_fbdev_shmem_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_shmem.c:229 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client.c:260 drm_lastclose drivers/gpu/drm/drm_file.c:391 [inline] drm_release+0x335/0x410 drivers/gpu/drm/drm_file.c:424 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6582d7e719 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:00007f658305fb88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000001917f RCX: 00007f6582d7e719 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f6582f37a80 R08: 0000000000000001 R09: 00007f658305fe7f R10: 00007f6582c00000 R11: 0000000000000246 R12: 00000000000191c5 R13: 00007f658305fc90 R14: 0000000000000032 R15: ffffffffffffffff