------------[ cut here ]------------ WARNING: CPU: 0 PID: 7530 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 Modules linked in: CPU: 0 UID: 0 PID: 7530 Comm: syz.1.233 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 lr : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 sp : ffff80009d967560 x29: ffff80009d967560 x28: 1fffe00018ce2a38 x27: ffff0000c6715080 x26: ffff80009d9675a0 x25: 1ffff00013b2ceb4 x24: 1ffff00013b2ced8 x23: dfff800000000000 x22: 0000001c882db6b8 x21: 0000001c882db6b8 x20: ffff0000c8e1c080 x19: ffff80009d9676c0 x18: 1fffe0003386aa76 x17: ffff80008f31e000 x16: ffff80008adbeaf4 x15: 0000000000000002 x14: 1fffe00018e69ba1 x13: 0000000000000000 x12: ffff80009e179000 x11: ffff600018e69ba3 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000c40d9e80 x7 : 0000000000000000 x6 : ffff80009e179000 x5 : ffff0000c734dd18 x4 : ffff0000c734dcd8 x3 : 0000000000000000 x2 : ffff80009d9676c0 x1 : 0000001c882db6b8 x0 : 0000001c882db6b8 Call trace: vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 (P) drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline] drm_crtc_next_vblank_start+0x1b8/0x380 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+0x1a0/0x78c drivers/gpu/drm/drm_atomic_helper.c:1643 drm_atomic_helper_commit+0x4d0/0x8cc drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0x204/0x25c drivers/gpu/drm/drm_atomic.c:1518 drm_client_modeset_commit_atomic+0x524/0x6ac drivers/gpu/drm/drm_client_modeset.c:1079 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1182 drm_client_modeset_commit+0x50/0x7c 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+0x90/0x188 drivers/gpu/drm/drm_fb_helper.c:1985 drm_fbdev_client_restore+0x3c/0x50 drivers/gpu/drm/clients/drm_fbdev_client.c:31 drm_client_dev_restore+0x120/0x238 drivers/gpu/drm/drm_client_event.c:116 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline] drm_release+0x2f8/0x3e0 drivers/gpu/drm/drm_file.c:429 __fput+0x340/0x75c fs/file_table.c:465 ____fput+0x20/0x58 fs/file_table.c:493 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x16c/0x1ec arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb4/0x17c arch/arm64/kernel/entry-common.c:768 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 43112 hardirqs last enabled at (43111): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (43111): [] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (43112): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:511 softirqs last enabled at (42320): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (42320): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (42297): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]---