From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f78.google.com (mail-ot1-f78.google.com [209.85.210.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E3703A0B36 for ; Sun, 19 Jul 2026 17:11:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784481096; cv=none; b=ps/xFIaiWnG3fzYZd92jtBJKfSqJGft+HbK9pjZ38acAa4XScrYg87yFglyTYx5F9JUIBkoMrZDvnmV7MA8k6tlpVDQbVqt+dDMnonY7BjuMyg95N1xvqagPUXXqhwjD4+GD2d4pORvbR2JfuDpQaM3hZ1DcY60RksTQB09qiao= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784481096; c=relaxed/simple; bh=JBduvcBpAzt0nb8cCS1EPnyNaBDUEJNlFntVtyIrlHw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=l+ThRZoKxxoMdl1sbPjlyPRJHBbw9p5BuwX2hkne4KR9SIiK6Qvx7BV61s+ZX1NFOCeAHeF/JOcRGzYqYQMP60FcHV/aWpaFemDS/bLAP5/Oz/VVBRhCtsSieIRxVvw0hwdeEuGsKEKD20Z3YB1bZBK1wURPnriYYg8EPM7jYcA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f78.google.com with SMTP id 46e09a7af769-7e9f6a49e69so7888433a34.0 for ; Sun, 19 Jul 2026 10:11:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784481094; x=1785085894; h=content-transfer-encoding:content-type:to:from:subject:message-id :date:mime-version:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=8BQcefzpD21oTep1ua4pACn1Zh/JefrOarGjSiHQSZU=; b=WDLMfExDfYkuR+QRJLRpKdHtR7dM4QgpA1aNRnHbqWs9j3gCa2aPMfVGzsp6yY//+3 Lo9Rf7fUyAx0YNSzGTkzLYnwTTpHLLxpCvNs9paXPEEDjFHVjssYmwg1ExnI4mLCuSiW NQKe+SEqUm+qlSj78bk6p39HmLMtZuQmUCyAzjTZi4i6e0k3yV9iMPFAcSIqf2Fz8++S Wg1epweBTI46jnv2/anGnmWnOhrSXjTF+VAfkAQX63DNPJaMztc7GumIzolE5BUXyUnC RGL8HBc4FVEyp7Twsah+EVrt4YrJqkCF7UIIJGDuzcXrIIBjYnV/uRv1ynZ+mIVTpVWe ZcwA== X-Forwarded-Encrypted: i=1; AHgh+RoY2CBYYv1+4Lo6PiBiE0ne4RaPBvxDvVqXrXF4k3KuZBWAomSB1ktASeEcuUnaeL4Hv1G24ix1+Qn5@vger.kernel.org X-Gm-Message-State: AOJu0YzvaHboFuiIbKEGmQLtDnyNdEIJcpUVXL9xFrC/tQtuOvB6fTRQ XJ/NIXqPzKiWaxBG4qpDWg1doxDUcFm4V2R5nTUvJTzA/Jk/lF98m6eZAj7hqRbnu0BimKPLsoq AIt/MtCc6kbssO3x8dZHcvW6eJBFNd1oIw8BxcIkabANQIhqA2h5Bg5EBt4I= Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6f8d:b0:497:df42:1dee with SMTP id 5614622812f47-4a4d040ef1emr6595795b6e.35.1784481093959; Sun, 19 Jul 2026 10:11:33 -0700 (PDT) Date: Sun, 19 Jul 2026 10:11:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a5d0545.5028b7d0.1f0bb.0246.GAE@google.com> Subject: [syzbot] [dri?] linux-next test error: WARNING in drm_mode_config_validate From: syzbot To: airlied@gmail.com, dri-devel@lists.freedesktop.org, hamohammed.sa@gmail.com, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, louis.chauvet@bootlin.com, maarten.lankhorst@linux.intel.com, melissa.srw@gmail.com, mripard@kernel.org, sfr@canb.auug.org.au, simona@ffwll.ch, syzkaller-bugs@googlegroups.com, tzimmermann@suse.de Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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=3D16351c32580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D2f6d4fd2982f997= 7 dashboard link: https://syzkaller.appspot.com/bug?extid=3D6245cb95ae707991b= ffa 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/bzI= mage-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) =C2=A9 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 =3D 8192, nTxLock =3D 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=3D4096 Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled 00:02: ttyS0 I/O:0x3f8 (irq =3D 4, base_baud =3D 115200) is a 16550A 00:03: ttyS1 I/O:0x2f8 (irq =3D 3, base_baud =3D 115200) is a 16550A 00:04: ttyS2 I/O:0x3e8 (irq =3D 6, base_baud =3D 115200) is a 16550A 00:05: ttyS3 I/O:0x2e8 (irq =3D 7, base_baud =3D 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_a= lpha_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)= =20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Goo= gle 06/25/2026 RIP: 0010:validate_blend_mode_for_alpha_formats drivers/gpu/drm/drm_mode_co= nfig.c:872 [inline] RIP: 0010:drm_mode_config_validate+0x1cab/0x1e60 drivers/gpu/drm/drm_mode_c= onfig.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 e= b 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:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000e946000 CR4: 00000000003526f0 Call Trace: 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 ---------------- 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