------------[ cut here ]------------ WARNING: CPU: 1 PID: 7811 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: 1 UID: 0 PID: 7811 Comm: syz.2.253 Not tainted 6.12.0-rc2-syzkaller-00291-g09f6b0c8904b #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 28 6e 10 fc 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 0e e0 a9 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:ffffc90003fe7648 EFLAGS: 00010293 RAX: ffffffff85eb06f2 RBX: 0000008103a0a021 RCX: ffff88802073bc00 RDX: 0000000000000000 RSI: 0000008103a0a021 RDI: 0000008103a0a021 RBP: ffffc90003fe77e0 R08: ffffffff85eb065f R09: 1ffffffff285250a R10: dffffc0000000000 R11: ffffffff85eb0570 R12: 0000008103a0a021 R13: ffff8881482eb950 R14: 1ffff920007fcefc R15: ffff888024cf4000 FS: 0000555591dd1500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c44bac8 CR3: 000000002d7be000 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 commit_tail+0x75/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1819 drm_atomic_helper_commit+0x953/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2073 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:228 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: 0033:0x7f4fc5b7dff9 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:00007ffc1ca22768 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f4fc5d37a80 RCX: 00007f4fc5b7dff9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f4fc5d37a80 R08: 0000000000000006 R09: 00007ffc1ca22a5f R10: 00000000003ff954 R11: 0000000000000246 R12: 0000000000087455 R13: 00007ffc1ca22870 R14: 0000000000000032 R15: ffffffffffffffff