------------[ cut here ]------------ WARNING: CPU: 1 PID: 19111 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 19111 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 00 74 08 48 89 ef e8 6d 69 22 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 3f 19 bf fb 90 <0f> 0b 90 eb e0 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 74 fe ff ff 48 RSP: 0018:ffffc90009897080 EFLAGS: 00010093 RAX: ffffffff85d5dc11 RBX: 0000008a44be870c RCX: ffff88801131da00 RDX: 0000000000000000 RSI: 0000008a44be870c RDI: 0000008a44be870c RBP: ffffc90009897150 R08: ffffffff85d5db79 R09: fffff52001312e18 R10: dffffc0000000000 R11: ffffffff85d5da40 R12: 0000008a44be870c R13: 1ffff92001312e2a R14: 0000000000000000 R15: ffff88801f910000 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f89ec36cd58 CR3: 0000000025412000 CR4: 00000000003506f0 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:867 [inline] drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:886 [inline] drm_update_vblank_count+0x25a/0x9c0 drivers/gpu/drm/drm_vblank.c:298 drm_vblank_disable_and_save+0xee/0x3b0 drivers/gpu/drm/drm_vblank.c:467 drm_crtc_vblank_off+0x34a/0x990 drivers/gpu/drm/drm_vblank.c:1351 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1213 [inline] drm_atomic_helper_commit_modeset_disables+0xcff/0x1a10 drivers/gpu/drm/drm_atomic_helper.c:1417 vkms_atomic_commit_tail+0x50/0x200 drivers/gpu/drm/vkms/vkms_drv.c:71 commit_tail+0x2a9/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1832 drm_atomic_helper_commit+0x953/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0x2ac/0x310 drivers/gpu/drm/drm_atomic.c:1514 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1180 __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+0xbb/0x180 drivers/gpu/drm/drm_fb_helper.c:2005 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client.c:247 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline] drm_release+0x47c/0x560 drivers/gpu/drm/drm_file.c:437 __fput+0x429/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:878 do_group_exit+0x207/0x2c0 kernel/exit.c:1027 get_signal+0x176e/0x1850 kernel/signal.c:2907 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0xc9/0x360 kernel/entry/common.c:212 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f89eb67de69 Code: Unable to access opcode bytes at 0x7f89eb67de3f. RSP: 002b:00007f89ec3ae178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007f89eb7ac1f8 RCX: 00007f89eb67de69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f89eb7ac1f8 RBP: 00007f89eb7ac1f0 R08: 00007f89eb8cfa47 R09: 00007f89ec3ae6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f89eb7ac1fc R13: 000000000000000b R14: 00007f89eb8cf960 R15: 00007f89eb8cfa48