------------[ cut here ]------------ WARNING: CPU: 0 PID: 7536 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x184/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 0 PID: 7536 Comm: syz.5.544 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:vkms_get_vblank_timestamp+0x184/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 e1 7c d3 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 fc 4a 83 fc <0f> 0b eb ea 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ba fe ff ff 4c RSP: 0018:ffffc900048af0e8 EFLAGS: 00010093 RAX: ffffffff84fd94d4 RBX: ffffc900048af190 RCX: ffff888026551dc0 RDX: 0000000000000000 RSI: 0000003f75623d88 RDI: 0000003f75623d88 RBP: 1ffff92000915e32 R08: 0000000000000004 R09: 0000000000000003 R10: fffff52000915e20 R11: 1ffff92000915e20 R12: 0000003f75623d88 R13: dffffc0000000000 R14: ffff8881486fc000 R15: 0000003f75623d88 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbbce2e0f50 CR3: 0000000028e6b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:881 [inline] drm_update_vblank_count+0x28b/0x910 drivers/gpu/drm/drm_vblank.c:303 drm_vblank_disable_and_save+0xd6/0x3a0 drivers/gpu/drm/drm_vblank.c:477 drm_crtc_vblank_off+0x217/0x7f0 drivers/gpu/drm/drm_vblank.c:1325 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1255 [inline] drm_atomic_helper_commit_modeset_disables+0xc64/0x18d0 drivers/gpu/drm/drm_atomic_helper.c:1459 vkms_atomic_commit_tail+0x4d/0x200 drivers/gpu/drm/vkms/vkms_drv.c:71 commit_tail+0x27a/0x390 drivers/gpu/drm/drm_atomic_helper.c:1831 drm_atomic_helper_commit+0x6d3/0x730 drivers/gpu/drm/drm_atomic_helper.c:2071 drm_atomic_commit+0x248/0x2a0 drivers/gpu/drm/drm_atomic.c:1452 drm_client_modeset_commit_atomic+0x61d/0x760 drivers/gpu/drm/drm_client_modeset.c:1061 drm_client_modeset_commit_locked+0xc7/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1164 drm_client_modeset_commit+0x46/0x70 drivers/gpu/drm/drm_client_modeset.c:1190 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:253 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:280 [inline] drm_fb_helper_lastclose drivers/gpu/drm/drm_fb_helper.c:2108 [inline] drm_fbdev_client_restore+0xb5/0x150 drivers/gpu/drm/drm_fb_helper.c:2520 drm_client_dev_restore+0x134/0x270 drivers/gpu/drm/drm_client.c:247 drm_lastclose drivers/gpu/drm/drm_file.c:462 [inline] drm_release+0x41a/0x5d0 drivers/gpu/drm/drm_file.c:493 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x93e/0x2400 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:288 RIP: 0033:0x7f7a2cbc3e89 Code: Unable to access opcode bytes at 0x7f7a2cbc3e5f. RSP: 002b:00007f7a2add51c0 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: 0000000000000000 RBX: 00007f7a2cb462a0 RCX: 00007f7a2cbc3e89 RDX: 00007f7a2cb462a0 RSI: 0000000000000058 RDI: 00007ffc446939a0 RBP: 00007f7a2add56c0 R08: 00007f7a2add56c0 R09: 00007ffc44693a87 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8 R13: 000000000000006e R14: 00007ffc446939a0 R15: 00007ffc44693a88