------------[ 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#0: syz.5.478/6569
WARNING: drivers/gpu/drm/drm_mode_config.c:872 at drm_mode_config_validate+0x380/0x560 drivers/gpu/drm/drm_mode_config.c:938, CPU#0: syz.5.478/6569
Modules linked in:
CPU: 0 UID: 0 PID: 6569 Comm: syz.5.478 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: linux,dummy-virt (DT)
pstate: 61402009 (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+0x380/0x560 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+0x380/0x560 drivers/gpu/drm/drm_mode_config.c:938
sp : ffff800085bcbbb0
x29: ffff800085bcbbc0 x28: fdf0000043c1d500 x27: 0000000000000000
x26: 0000000000000001 x25: ffff800082751288 x24: ffff8000827513f0
x23: fbf000000853aa90 x22: 0000000000000001 x21: fbf000000853a800
x20: fcf000000787b880 x19: 0000000000000001 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 00000000000002ba x13: 00000000eac0c6e6 x12: 0000a9d41423d5d2
x11: 00000000000000c0 x10: 301cf479833f671e x9 : 727d0c44570eb40f
x8 : fdf0000043c1e588 x7 : 0000000000000004 x6 : 0000000000000000
x5 : fdf0000043c1d500 x4 : fbffff3fffffffff x3 : 000000000000ffff
x2 : 0000000000000000 x1 : 0000000000000000 x0 : fdf0000043c1d500
Call trace:
 validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline] (P)
 drm_mode_config_validate+0x380/0x560 drivers/gpu/drm/drm_mode_config.c:938 (P)
 drm_dev_register+0x1c0/0x2a0 drivers/gpu/drm/drm_drv.c:1077
 vkms_create+0x184/0x1c8 drivers/gpu/drm/vkms/vkms_drv.c:208
 device_enabled_store+0xdc/0xf4 drivers/gpu/drm/vkms/vkms_configfs.c:719
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0xc4/0x128 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x244/0x36c fs/read_write.c:687
 ksys_write+0x70/0x108 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+0x18/0x24 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x54/0x10c arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x1c/0x34 arch/arm64/kernel/syscall.c:140
 el0_svc+0x38/0x1fc arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:590
---[ end trace 0000000000000000 ]---
[drm] Initialized vkms 1.0.0 for mydev on minor 2
faux_driver mydev: [drm] fb1: vkmsdrmfb frame buffer device