------------[ cut here ]------------ WARNING: CPU: 1 PID: 7751 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: 1 UID: 0 PID: 7751 Comm: syz.6.162 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (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 : ffff80009c086fe0 x29: ffff80009c086fe0 x28: 1fffe00019466338 x27: ffff0000ca331880 x26: ffff80009c087020 x25: 1ffff00013810e04 x24: 1ffff00013810e28 x23: dfff800000000000 x22: 0000000bfc260826 x21: 0000000bfc260826 x20: ffff0000ca1cc080 x19: ffff80009c087140 x18: 1fffe000337db690 x17: ffff800093325000 x16: ffff80008052bd88 x15: 0000000000000001 x14: 1ffff00012e743d0 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700012e743d1 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff000104e80000 x7 : ffff8000806305a4 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff80009c087140 x1 : 0000000bfc260826 x0 : 0000000bfc260826 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:879 [inline] drm_crtc_next_vblank_start+0x1b8/0x380 drivers/gpu/drm/drm_vblank.c:1013 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1718 [inline] drm_atomic_helper_wait_for_fences+0x1a0/0x78c drivers/gpu/drm/drm_atomic_helper.c:1765 commit_tail+0x80/0x3bc drivers/gpu/drm/drm_atomic_helper.c:1979 drm_atomic_helper_commit+0x84c/0x8cc drivers/gpu/drm/drm_atomic_helper.c:2233 drm_atomic_commit+0x204/0x25c drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x524/0x6ac drivers/gpu/drm/drm_client_modeset.c:1103 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1206 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1232 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:238 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:268 [inline] drm_fb_helper_lastclose+0x90/0x188 drivers/gpu/drm/drm_fb_helper.c:1986 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:117 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline] drm_release+0x2f8/0x3e0 drivers/gpu/drm/drm_file.c:441 __fput+0x340/0x75c fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1dc/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x524/0x1a14 kernel/exit.c:966 do_group_exit+0x194/0x22c kernel/exit.c:1107 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 arch_do_signal_or_restart+0x274/0x4414 arch/arm64/kernel/signal.c:1619 exit_to_user_mode_loop+0x7c/0x178 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 4042 hardirqs last enabled at (4041): [] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214 hardirqs last disabled at (4042): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:412 softirqs last enabled at (3836): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (3836): [] sctp_close+0x5f0/0x790 net/sctp/socket.c:1553 softirqs last disabled at (3816): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (3816): [] sctp_close+0x57c/0x790 net/sctp/socket.c:1543 ---[ end trace 0000000000000000 ]---