------------[ cut here ]------------ WARNING: CPU: 1 PID: 26123 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x148/0x194 drivers/gpu/drm/vkms/vkms_crtc.c:113 Modules linked in: CPU: 1 UID: 0 PID: 26123 Comm: syz.0.4892 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0 Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x148/0x194 drivers/gpu/drm/vkms/vkms_crtc.c:100 lr : vkms_get_vblank_timestamp+0x3c/0x194 drivers/gpu/drm/vkms/vkms_crtc.c:91 sp : ffff80008d7f7560 x29: ffff80008d7f7560 x28: ffff000018d07400 x27: 0000000000000003 x26: ffff0000136ccd70 x25: 0000000000000000 x24: 1fffe00001ebbf38 x23: ffff8000856aece0 x22: 000004f75d88c520 x21: ffff0000136cc000 x20: ffff80008d7f7730 x19: ffff00000f5df880 x18: 00000000154c59cb x17: ffff800081b5b160 x16: 0000000000000000 x15: ffff0000198e2880 x14: 1fffe0000331c50f x13: 1fffe0000331c532 x12: ffff700010dc31b1 x11: 1ffff00010dc31b0 x10: ffff700010dc31b0 x9 : dfff800000000000 x8 : 0000000041b58ab3 x7 : ffff700011afeebc x6 : dfff800000000000 x5 : 0000000000000000 x4 : ffff800081caf1e8 x3 : 1fffe00001ebbf4a x2 : 1fffe00001ebbf35 x1 : 0000000000000000 x0 : 000004f75d88c520 Call trace: vkms_get_vblank_timestamp+0x148/0x194 drivers/gpu/drm/vkms/vkms_crtc.c:113 drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:878 drm_crtc_next_vblank_start+0x11c/0x244 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+0x184/0x614 drivers/gpu/drm/drm_atomic_helper.c:1605 commit_tail+0x74/0x3e0 drivers/gpu/drm/drm_atomic_helper.c:1819 drm_atomic_helper_commit+0x260/0x2b4 drivers/gpu/drm/drm_atomic_helper.c:2073 drm_atomic_commit+0x1c8/0x280 drivers/gpu/drm/drm_atomic.c:1516 drm_client_modeset_commit_atomic+0x4a0/0x5f4 drivers/gpu/drm/drm_client_modeset.c:1068 drm_client_modeset_commit_locked+0x108/0x3fc drivers/gpu/drm/drm_client_modeset.c:1171 drm_client_modeset_commit+0x44/0x74 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:216 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:264 [inline] drm_fb_helper_lastclose+0xac/0x130 drivers/gpu/drm/drm_fb_helper.c:2003 drm_fbdev_shmem_client_restore+0x30/0x4c drivers/gpu/drm/drm_fbdev_shmem.c:229 drm_client_dev_restore+0x12c/0x214 drivers/gpu/drm/drm_client.c:260 drm_lastclose drivers/gpu/drm/drm_file.c:391 [inline] drm_release+0x210/0x2d8 drivers/gpu/drm/drm_file.c:424 __fput+0x2c4/0x944 fs/file_table.c:431 ____fput+0x14/0x20 fs/file_table.c:459 task_work_run+0x128/0x210 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x1d4/0x25c 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_compat+0xfc/0x17c arch/arm64/kernel/entry-common.c:853 el0t_32_sync_handler+0x98/0x13c arch/arm64/kernel/entry-common.c:862 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:603 irq event stamp: 4740 hardirqs last enabled at (4739): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (4739): [] exit_to_kernel_mode+0x38/0x118 arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (4740): [] el1_dbg+0x24/0x9c arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (4730): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (4730): [] handle_softirqs+0x878/0xd40 kernel/softirq.c:582 softirqs last disabled at (4647): [] __do_softirq+0x14/0x20 kernel/softirq.c:588 ---[ end trace 0000000000000000 ]---