------------[ cut here ]------------ WARNING: CPU: 1 PID: 6924 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: 1 UID: 0 PID: 6924 Comm: syz.0.285 Not tainted 6.15.0-rc4-syzkaller-00291-g2a239ffbebb5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 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 24 29 42 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ea 58 e2 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:ffffc90003c774c8 EFLAGS: 00010283 RAX: ffffffff85dd6676 RBX: ffffc90003c77640 RCX: 0000000000080000 RDX: ffffc9000ef59000 RSI: 00000000000020df RDI: 00000000000020e0 RBP: 1ffff9200078eec8 R08: ffffc90003359000 R09: 0000000000000000 R10: ffffc90003359000 R11: ffffffff85dd6540 R12: 0000002a578304e1 R13: dffffc0000000000 R14: ffff888147abc028 R15: 0000002a578304e1 FS: 00007fccd8fcb6c0(0000) GS:ffff8881261ff000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004000 CR3: 000000007f120000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline] drm_crtc_next_vblank_start+0x223/0x470 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline] drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1643 drm_atomic_helper_commit+0x5c7/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0x25f/0x2c0 drivers/gpu/drm/drm_atomic.c:1518 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1079 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1182 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1208 __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:267 [inline] drm_fb_helper_lastclose+0xa4/0x1c0 drivers/gpu/drm/drm_fb_helper.c:1985 drm_fbdev_client_restore+0x34/0x40 drivers/gpu/drm/clients/drm_fbdev_client.c:31 drm_client_dev_restore+0x139/0x270 drivers/gpu/drm/drm_client_event.c:116 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline] drm_release+0x318/0x3f0 drivers/gpu/drm/drm_file.c:429 __fput+0x449/0xa70 fs/file_table.c:465 task_work_run+0x1d1/0x260 kernel/task_work.c:227 get_signal+0x11c5/0x1310 kernel/signal.c:2807 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fccd818e969 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:00007fccd8fcb038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: fffffffffffffe00 RBX: 00007fccd83b6160 RCX: 00007fccd818e969 RDX: 0000200000000040 RSI: 0000200000000100 RDI: 0000000000000000 RBP: 00007fccd8210ab1 R08: 0000200000000140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fccd83b6160 R15: 00007ffed48e7ec8