------------[ cut here ]------------ [PLANE:35:plane-0] pixel format with alpha exposed but blend mode not setup WARNING: drivers/gpu/drm/drm_mode_config.c:872 at validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline], CPU#1: syz.1.3/3533 WARNING: drivers/gpu/drm/drm_mode_config.c:872 at drm_mode_config_validate+0xa64/0x1914 drivers/gpu/drm/drm_mode_config.c:938, CPU#1: syz.1.3/3533 Modules linked in: CPU: 1 UID: 0 PID: 3533 Comm: syz.1.3 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline] pc : drm_mode_config_validate+0xa64/0x1914 drivers/gpu/drm/drm_mode_config.c:938 lr : validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline] lr : drm_mode_config_validate+0xa64/0x1914 drivers/gpu/drm/drm_mode_config.c:938 sp : ffff8000a18f7870 x29: ffff8000a18f7880 x28: ffff00001329d080 x27: 0000000000000001 x26: dfff800000000000 x25: ffff0000156d47c0 x24: ffff00001329d170 x23: ffff00001329d178 x22: 0000000000000003 x21: ffff600002653a2e x20: 0000000000000000 x19: 1fffe00002653a2f x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000877cb698 x14: 1ffff00010ef96d3 x13: ffff800089ebaf18 x12: ffff60000d7f6a22 x11: 1fffe0000d7f6a21 x10: ffff60000d7f6a21 x9 : dfff800000000000 x8 : ffff8000a18f73a0 x7 : ffff8000a18f7520 x6 : ffff8000a18f74c0 x5 : ffff8000a18f7400 x4 : 0000000000000005 x3 : 1fffe0000d7f5b5d x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000156f5700 Call trace: validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline] (P) drm_mode_config_validate+0xa64/0x1914 drivers/gpu/drm/drm_mode_config.c:938 (P) drm_dev_register+0x3d0/0x7e0 drivers/gpu/drm/drm_drv.c:1077 vkms_create+0x378/0x450 drivers/gpu/drm/vkms/vkms_drv.c:208 device_enabled_store+0x1c8/0x22c drivers/gpu/drm/vkms/vkms_configfs.c:719 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x244/0x398 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x4c0/0xbac fs/read_write.c:687 ksys_write+0xf0/0x1e0 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x70/0xa0 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x58/0x2a4 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 irq event stamp: 5796 hardirqs last enabled at (5795): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1698 [inline] hardirqs last enabled at (5795): [] finish_lock_switch kernel/sched/core.c:5251 [inline] hardirqs last enabled at (5795): [] finish_task_switch.isra.0+0x1e4/0x9f0 kernel/sched/core.c:5369 hardirqs last disabled at (5796): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445 softirqs last enabled at (5734): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (5734): [] handle_softirqs+0xa98/0x1048 kernel/softirq.c:673 softirqs last disabled at (5711): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ end trace 0000000000000000 ]--- [drm] Initialized vkms 1.0.0 for mydev on minor 2 faux_driver mydev: [drm] fb1: vkmsdrmfb frame buffer device