[syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    cc2b5f627e8c Add linux-next specific files for 20260714
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17fb04b9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2290ccbf984c524f
dashboard link: https://syzkaller.appspot.com/bug?extid=2302c5dc59995fbb8089
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d598b9580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14500789580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6836f8efb1da/disk-cc2b5f62.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0109d3477cc7/vmlinux-cc2b5f62.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c2e49e350bbf/bzImage-cc2b5f62.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2302c5dc59995fbb8089@syzkaller.appspotmail.com

em28xx 1-1:0.132: AC97 chip type couldn't be determined
em28xx 1-1:0.132: No AC97 audio processor
usb 1-1: Decoder not found
em28xx 1-1:0.132: failed to create media graph
em28xx 1-1:0.132: V4L2 device video103 deregistered
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 5649 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: events request_module_async
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 assign_lock_key+0x133/0x150 kernel/locking/lockdep.c:1000
 register_lock_class+0xcc/0x2e0 kernel/locking/lockdep.c:1315
 __lock_acquire+0xaf/0x2e40 kernel/locking/lockdep.c:5128
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5906
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 __wake_up_common_lock+0x2f/0x1f0 kernel/sched/wait.c:124
 __vb2_queue_cancel+0x2de/0xdc0 drivers/media/common/videobuf2/videobuf2-core.c:2244
 vb2_core_queue_release+0x2f/0x150 drivers/media/common/videobuf2/videobuf2-core.c:2677
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline]
 vb2_video_unregister_device+0x15b/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:1292
 em28xx_v4l2_init+0x1c60/0x3140 drivers/media/usb/em28xx/em28xx-video.c:3097
 em28xx_init_extension+0x120/0x1d0 drivers/media/usb/em28xx/em28xx-core.c:1248
 process_one_work+0xaaf/0x1480 kernel/workqueue.c:3379
 process_scheduled_works kernel/workqueue.c:3462 [inline]
 worker_thread+0xb05/0x10d0 kernel/workqueue.c:3543
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 5649 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: events request_module_async
RIP: 0010:__wake_up_common kernel/sched/wait.c:104 [inline]
RIP: 0010:__wake_up_common_lock+0xd6/0x1f0 kernel/sched/wait.c:125
Code: 0f 84 d4 00 00 00 44 8b 7c 24 04 eb 13 48 ba 00 00 00 00 00 fc ff df 4c 39 ed 0f 84 ba 00 00 00 49 89 ee 48 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 1c ce 93 00 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc9000595f908 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8bcbd060 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1fa1890 R12: ffff88803e181b14
R13: ffff88803e181c28 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125af2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005625301fb660 CR3: 000000003774e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __vb2_queue_cancel+0x2de/0xdc0 drivers/media/common/videobuf2/videobuf2-core.c:2244
 vb2_core_queue_release+0x2f/0x150 drivers/media/common/videobuf2/videobuf2-core.c:2677
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline]
 vb2_video_unregister_device+0x15b/0x200 drivers/media/common/videobuf2/videobuf2-v4l2.c:1292
 em28xx_v4l2_init+0x1c60/0x3140 drivers/media/usb/em28xx/em28xx-video.c:3097
 em28xx_init_extension+0x120/0x1d0 drivers/media/usb/em28xx/em28xx-core.c:1248
 process_one_work+0xaaf/0x1480 kernel/workqueue.c:3379
 process_scheduled_works kernel/workqueue.c:3462 [inline]
 worker_thread+0xb05/0x10d0 kernel/workqueue.c:3543
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__wake_up_common kernel/sched/wait.c:104 [inline]
RIP: 0010:__wake_up_common_lock+0xd6/0x1f0 kernel/sched/wait.c:125
Code: 0f 84 d4 00 00 00 44 8b 7c 24 04 eb 13 48 ba 00 00 00 00 00 fc ff df 4c 39 ed 0f 84 ba 00 00 00 49 89 ee 48 89 e8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 1c ce 93 00 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc9000595f908 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8bcbd060 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1fa1890 R12: ffff88803e181b14
R13: ffff88803e181c28 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125af2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005625301fb660 CR3: 000000003774e000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	0f 84 d4 00 00 00    	je     0xda
   6:	44 8b 7c 24 04       	mov    0x4(%rsp),%r15d
   b:	eb 13                	jmp    0x20
   d:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  14:	fc ff df
  17:	4c 39 ed             	cmp    %r13,%rbp
  1a:	0f 84 ba 00 00 00    	je     0xda
  20:	49 89 ee             	mov    %rbp,%r14
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
  2e:	74 12                	je     0x42
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 1c ce 93 00       	call   0x93ce54
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	00 fc                	add    %bh,%ah


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: gautambhadori9@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5
diff --git a/drivers/media/usb/em28xx/em28xx-video.c
b/drivers/media/usb/em28xx/em28xx-video.c
index c418add65b..d93f1b5049 100644
--- a/drivers/media/usb/em28xx/em28xx-video.c
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -1410,6 +1410,9 @@ static int em28xx_vb2_setup(struct em28xx *dev)
  if (rc < 0)
  return rc;

+ if (!em28xx_vbi_supported(dev))
+ return 0;
+
  /* Setup Videobuf2 for VBI capture */
  q = &v4l2->vb_vbiq;
  q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
@@ -2416,7 +2419,7 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
  if (video_is_registered(&v4l2->radio_dev)) {
  dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
  video_device_node_name(&v4l2->radio_dev));
- vb2_video_unregister_device(&v4l2->radio_dev);
+ video_unregister_device(&v4l2->radio_dev);
  }
  if (video_is_registered(&v4l2->vbi_dev)) {
  dev_info(&dev->intf->dev, "V4L2 device %s deregistered\n",
@@ -2954,6 +2957,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
  mutex_init(&v4l2->vb_vbi_queue_lock);
  v4l2->vdev.queue = &v4l2->vb_vidq;
  v4l2->vdev.queue->lock = &v4l2->vb_queue_lock;
+ v4l2->vb_vbiq.lock = &v4l2->vb_vbi_queue_lock;
  v4l2->vdev.device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE |
  V4L2_CAP_STREAMING;
  if (dev->int_audio_type != EM28XX_INT_AUDIO_NONE)
@@ -2983,6 +2987,11 @@ static int em28xx_v4l2_init(struct em28xx *dev)
  if (dev->chip_id == CHIP_ID_EM2828X || dev->board.decoder == EM28XX_BUILTIN)
  v4l2_disable_ioctl(&v4l2->vdev, VIDIOC_ENUM_FRAMESIZES);

+ /* Initialize the queues before registering devices that reference them. */
+ ret = em28xx_vb2_setup(dev);
+ if (ret)
+ goto unregister_dev;
+
  /* register v4l2 video video_device */
  ret = video_register_device(&v4l2->vdev, VFL_TYPE_VIDEO,
      video_nr[dev->devno]);
@@ -3068,9 +3077,6 @@ static int em28xx_v4l2_init(struct em28xx *dev)
  /* Save some power by putting tuner to sleep */
  v4l2_device_call_all(&v4l2->v4l2_dev, 0, tuner, standby);

- /* initialize videobuf2 stuff */
- em28xx_vb2_setup(dev);
-
  dev_info(&dev->intf->dev,
  "V4L2 extension successfully initialized\n");

@@ -3082,7 +3088,7 @@ static int em28xx_v4l2_init(struct em28xx *dev)
  dev_info(&dev->intf->dev,
  "V4L2 device %s deregistered\n",
  video_device_node_name(&v4l2->radio_dev));
- vb2_video_unregister_device(&v4l2->radio_dev);
+ video_unregister_device(&v4l2->radio_dev);
  }
  if (video_is_registered(&v4l2->vbi_dev)) {
  dev_info(&dev->intf->dev,

Forwarded: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [syzbot] [media?] INFO: trying to register non-static key in __vb2_queue_cancel
Author: hokage.newbie@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
cc2b5f627e8ccbae1188ef2d8be3e451d7f933a5

Forwarded: [PATCH] drm/vkms: Advertise PREMULTI blend mode

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] drm/vkms: Advertise PREMULTI blend mode
Author: michail.tatas@gmail.com

#syz test

Since we only support pre-multiplied alpha blend mode,
advertise that.

Signed-off-by: Michail Tatas <michail.tatas@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_plane.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 68cb2a3335e6..8c67511d6e8c 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -246,6 +246,13 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 					  DRM_COLOR_YCBCR_BT601,
 					  DRM_COLOR_YCBCR_FULL_RANGE);
 
+	/*
+	 * Since our composer only supports pre-multiplied alpha,
+	 * advertise only the PREMULTI blend mode.
+	 */
+	drm_plane_create_blend_mode_property(&plane->base,
+					     BIT(DRM_MODE_BLEND_PREMULTI));
+
 	if (vkms_config_plane_get_default_pipeline(plane_cfg))
 		vkms_initialize_colorops(&plane->base);
 
-- 
2.43.0

[syzbot] [dri?] linux-next test error: WARNING in drm_mode_config_validate

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    0718283ab28b Add linux-next specific files for 20260717
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16351c32580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2f6d4fd2982f9977
dashboard link: https://syzkaller.appspot.com/bug?extid=6245cb95ae707991bffa
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/83fbf4236ddb/disk-0718283a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/53d15a8f3db7/vmlinux-0718283a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d826bc7a4a27/bzImage-0718283a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6245cb95ae707991bffa@syzkaller.appspotmail.com

smbdirect: subsystem loaded
Key type cifs.spnego registered
Key type cifs.idmap registered
ntfs3: Enabled Linux POSIX ACLs support
ntfs3: Read-only LZX/Xpress compression included
jffs2: version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
romfs: ROMFS MTD (C) 2007 Red Hat, Inc.
QNX4 filesystem 0.2.3 registered.
qnx6: QNX6 filesystem 1.0.0 registered.
fuse: init (API version 7.45)
orangefs_debugfs_init: called with debug mask: :none: :0:
orangefs_init: module version upstream loaded
JFS: nTxBlock = 8192, nTxLock = 65536
SGI XFS with ACLs, security attributes, realtime, scrub, repair, quota, no debug enabled
9p: Installing v9fs 9p2000 file system support
NILFS version 2 loaded
befs: version: 0.9.3
ocfs2: Registered cluster interface o2cb
ocfs2: Registered cluster interface user
OCFS2 User DLM kernel interface loaded
gfs2: GFS2 installed
ceph: loaded (mds proto 32)
NET: Registered PF_ALG protocol family
async_tx: api initialized (async)
Key type asymmetric registered
Asymmetric key parser 'x509' registered
Asymmetric key parser 'pkcs8' registered
Key type pkcs7_test registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 239)
io scheduler mq-deadline registered
io scheduler kyber registered
io scheduler bfq registered
raid6: skipped pq benchmark and selected avx2x4
input: Power Button as /devices/platform/LNXPWRBN:00/input/input0
ACPI: button: Power Button [PWRF]
input: Sleep Button as /devices/platform/LNXSLPBN:00/input/input1
ACPI: button: Sleep Button [SLPF]
ioatdma: Intel(R) QuickData Technology Driver 5.00
N_HDLC line discipline registered with maxframe=4096
Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
00:02: ttyS0 I/O:0x3f8 (irq = 4, base_baud = 115200) is a 16550A
00:03: ttyS1 I/O:0x2f8 (irq = 3, base_baud = 115200) is a 16550A
00:04: ttyS2 I/O:0x3e8 (irq = 6, base_baud = 115200) is a 16550A
00:05: ttyS3 I/O:0x2e8 (irq = 7, base_baud = 115200) is a 16550A
Non-volatile memory driver v1.3
usbcore: registered new interface driver xillyusb
ACPI: bus type drm_connector registered
[drm] Initialized vgem 1.0.0 for vgem on minor 0
------------[ cut here ]------------
[PLANE:35:plane-0] pixel format with alpha exposed but blend mode not setup
WARNING: drivers/gpu/drm/drm_mode_config.c:873 at validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline], CPU#0: swapper/0/1
WARNING: drivers/gpu/drm/drm_mode_config.c:873 at drm_mode_config_validate+0x1c6a/0x1e60 drivers/gpu/drm/drm_mode_config.c:938, CPU#0: swapper/0/1
Modules linked in:
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_config.c:872 [inline]
RIP: 0010:drm_mode_config_validate+0x1cab/0x1e60 drivers/gpu/drm/drm_mode_config.c:938
Code: 0f 85 ae 00 00 00 4d 8d 77 10 8b 6d 00 4c 89 f0 48 c1 e8 03 80 3c 18 00 74 08 4c 89 f7 e8 4d 08 a9 fc 49 8b 16 4c 89 ef 89 ee <67> 48 0f b9 3a eb 05 e8 39 fe 3a fc 49 bd 00 00 00 00 00 fc ff df
RSP: 0000:ffffc90000067810 EFLAGS: 00010246
RAX: 1ffff11004d63408 RBX: dffffc0000000000 RCX: ffff88801daeddc0
RDX: ffff8880268100e0 RSI: 0000000000000023 RDI: ffffffff9063bf50
RBP: 0000000000000023 R08: ffff888023a4e3ab R09: 1ffff11004749c75
R10: dffffc0000000000 R11: ffffed1004749c76 R12: dffffc0000000000
R13: ffffffff9063bf50 R14: ffff888026b1a040 R15: ffff888026b1a030
FS:  0000000000000000(0000) GS:ffff888124f37000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000e946000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_dev_register+0x7c/0xd80 drivers/gpu/drm/drm_drv.c:1075
 vkms_create+0x40d/0x4f0 drivers/gpu/drm/vkms/vkms_drv.c:208
 vkms_init+0x57/0x80 drivers/gpu/drm/vkms/vkms_drv.c:240
 do_one_initcall+0x250/0x870 init/main.c:1357
 do_initcall_level+0x10a/0x1a0 init/main.c:1419
 do_initcalls+0x59/0xa0 init/main.c:1435
 kernel_init_freeable+0x29d/0x3e0 init/main.c:1670
 kernel_init+0x22/0x1d0 init/main.c:1560
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f 85 ae 00 00 00    	jne    0xb4
   6:	4d 8d 77 10          	lea    0x10(%r15),%r14
   a:	8b 6d 00             	mov    0x0(%rbp),%ebp
   d:	4c 89 f0             	mov    %r14,%rax
  10:	48 c1 e8 03          	shr    $0x3,%rax
  14:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
  18:	74 08                	je     0x22
  1a:	4c 89 f7             	mov    %r14,%rdi
  1d:	e8 4d 08 a9 fc       	call   0xfca9086f
  22:	49 8b 16             	mov    (%r14),%rdx
  25:	4c 89 ef             	mov    %r13,%rdi
  28:	89 ee                	mov    %ebp,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb 05                	jmp    0x36
  31:	e8 39 fe 3a fc       	call   0xfc3afe6f
  36:	49 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%r13
  3d:	fc ff df


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Forwarded: [PATCH] drm/vkms: Advertise PREMULTI blend mode

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: [PATCH] drm/vkms: Advertise PREMULTI blend mode
Author: michail.tatas@gmail.com

#syz test

Since we only support pre-multiplied alpha blend mode,
advertise that, otherwise validate_blend_mode_for_alpha_formats()
will throw a WARN.

Signed-off-by: Michail Tatas <michail.tatas@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_plane.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 68cb2a3335e6..5a875fc90dee 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -246,6 +246,12 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 					  DRM_COLOR_YCBCR_BT601,
 					  DRM_COLOR_YCBCR_FULL_RANGE);
 
+	/* Since our composer only supports pre-multiplied alpha,
+	 * advertise only the PREMULTI blend mode.
+	 */
+	drm_plane_create_blend_mode_property(&plane->base,
+								BIT(DRM_MODE_BLEND_PREMULTI));
+
 	if (vkms_config_plane_get_default_pipeline(plane_cfg))
 		vkms_initialize_colorops(&plane->base);
 
-- 
2.43.0