From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (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 559098635D for ; Thu, 6 Aug 2026 00:01:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785974492; cv=none; b=KG+v7h3tX7WbK5dIkqUSbXTNMaSmoS+zZ+cOutp0RpaM/o9Werdx6j+8GysaRqUUPzfnwby9BIu0JYI0gedMMxob0ATOZwqYiqwSMmt4LP3pxhhIA2YKSbLLqwxzx03ZAHtBJ/KkeM6aoNfanfWNYrryYzar2vibicWFkmTFSDI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785974492; c=relaxed/simple; bh=p/IoeRRIOIzwSXi1I1NCd+Y0Ikp1A9En37b50pUpMU0=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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2002:a05:6820:2d0c:b0:6aa:1bc8:ae0d with SMTP id 006d021491bc7-6aeaba25683mr1898200eaf.4.1785974490090; Wed, 05 Aug 2026 17:01:30 -0700 (PDT) Date: Wed, 05 Aug 2026 17:01:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a73ceda.5aeeccc9.207e63.0007.GAE@google.com> Subject: [syzbot] [media?] WARNING in __media_pipeline_start From: syzbot To: laurent.pinchart@ideasonboard.com, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, sakari.ailus@linux.intel.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7235a3e71949 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=10c0dbb9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccf4bea59f67007 dashboard link: https://syzkaller.appspot.com/bug?extid=68e901d044baaea1f60c compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=163b7649580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13926cc6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fd45635beaae/disk-7235a3e7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d7d2e6507223/vmlinux-7235a3e7.xz kernel image: https://storage.googleapis.com/syzbot-assets/b5b5d8de4cea/Image-7235a3e7.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+68e901d044baaea1f60c@syzkaller.appspotmail.com vimc link validate: Sensor A:src:640x480 (0x42474752, 0, 0, 0, 0) Raw Capture 0:snk:640x480 (0x42474752, 8, 0, 0, 0) vimc link validate: Scaler:src:640x480 (0x33424752, 8, 0, 0, 0) RGB/YUV Capture:snk:640x480 (0x33424752, 8, 0, 0, 0) ------------[ cut here ]------------ WARNING: drivers/media/mc/mc-entity.c:785 at __media_pipeline_start+0x13c4/0x17fc drivers/media/mc/mc-entity.c:785, CPU#0: syz.0.17/4920 Modules linked in: CPU: 0 UID: 0 PID: 4920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __media_pipeline_start+0x13c4/0x17fc drivers/media/mc/mc-entity.c:785 lr : __media_pipeline_start+0x13c4/0x17fc drivers/media/mc/mc-entity.c:785 sp : ffff800093407710 x29: ffff800093407790 x28: ffff0000cbe68a20 x27: 1fffe000197cd0e6 x26: ffff0000cbe68760 x25: 1fffe000197cd15b x24: ffff0000cbe68ad8 x23: dfff800000000000 x22: ffff0000cbabf010 x21: 0000000000000001 x20: ffff0000cbe68b10 x19: dfff800000000000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000020007200 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff8000839d6934 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000839d4f70 x2 : 0000000000000001 x1 : ffff0000c4551d40 x0 : 0000000000000000 Call trace: __media_pipeline_start+0x13c4/0x17fc drivers/media/mc/mc-entity.c:785 (P) media_pipeline_start+0x58/0x7c drivers/media/mc/mc-entity.c:924 video_device_pipeline_start+0x88/0xb4 drivers/media/v4l2-core/v4l2-dev.c:1159 vimc_capture_start_streaming+0x6c/0xec drivers/media/test-drivers/vimc/vimc-capture.c:248 vb2_start_streaming+0x114/0x4ac drivers/media/common/videobuf2/videobuf2-core.c:1783 vb2_core_streamon+0x288/0x44c drivers/media/common/videobuf2/videobuf2-core.c:2336 vb2_streamon+0x80/0xb4 drivers/media/common/videobuf2/videobuf2-v4l2.c:875 vb2_ioctl_streamon+0xb8/0xd0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1118 v4l_streamon+0x64/0x94 drivers/media/v4l2-core/v4l2-ioctl.c:1965 __video_do_ioctl+0x768/0xaa8 drivers/media/v4l2-core/v4l2-ioctl.c:3133 video_usercopy+0x74c/0xe88 drivers/media/v4l2-core/v4l2-ioctl.c:3475 video_ioctl2+0x3c/0x50 drivers/media/v4l2-core/v4l2-ioctl.c:3532 v4l2_ioctl+0x148/0x18c drivers/media/v4l2-core/v4l2-dev.c:366 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 irq event stamp: 1910 hardirqs last enabled at (1909): [] kasan_quarantine_put+0xb4/0x1c4 mm/kasan/quarantine.c:234 hardirqs last disabled at (1910): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (1722): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1722): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (1722): [] do_sve_acc+0x32c/0x4b8 arch/arm64/kernel/fpsimd.c:1349 softirqs last disabled at (1720): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1720): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (1720): [] do_sve_acc+0x10c/0x4b8 arch/arm64/kernel/fpsimd.c:1325 ---[ end trace 0000000000000000 ]--- --- 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