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 5B4C08F49 for ; Thu, 18 Jun 2026 13:20:25 +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=1781788826; cv=none; b=aSrX/Rgb52PP2zkNkfj3YLH2KGfsQBmxV1WzcYt55L8D5xD3N4isToquDiKtenuGDL+tuErEws5g7JcFkCvmuy7IPGrBWKy2XnRVcLs2Pxr9e0obuYSeNPXWomoDB40bCJ5HJU/eMQxDnlAWwF4m/wiWZKTKCd+YIVlEt3oj5hk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781788826; c=relaxed/simple; bh=pXkuN96Sj1R2xwFnc87fHmurZ+59ZgaurHT3mZl0Dok=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Uo4nrO6VjhWKAT0C/ZVeZekSkW9cEeYh7AVHQcowE2frDdzRUaPZTToBFmLkIuJ7IgJ1ldkCiVKH9dyUEl137QImf5qf8rJrwoTGpFvVM0Yxy+WacGfQvWGvh/ij042lg6tlcnW1L77xAjujeqyLQ4PtiNFlIChN8YjE0WehK/w= 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=209.85.210.79 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-f79.google.com with SMTP id 46e09a7af769-7e713779405so1707693a34.3 for ; Thu, 18 Jun 2026 06:20:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781788824; x=1782393624; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=/33KdD2/H7Prs87vxAWUnAR8jSqCWlbJEsGg9+fs3rQ=; b=MOcK2ONL4utKlTJcExL/X6DnTJ4nNT61C30uLg/tuuIXpX2l7n/bAON93KjiWVSL2U /ZzB9pRGupxZurCmkF9FRNcnPopApxHQV1EbZ5Jw3soplbf4++t2/yHqSfEd3jiA+Zgm zwH122QeBzlM2EF+Y+7FbbmHBkpbE5ld+XVFjVwIi1btTG6OObOrpN5b0x6DOnb30s7p jdc2zK6Xu0Z2RIOAJgI76q7MJ4QhFmCMTYzAJsRBMjGnAe/gtVEf6mIDfGNgQVRLDHbN eHEe1tLSyNe0amMnmhxIAgAeBDpkOF7yMySQZqD0VSC5FuD9oOJ32alU3qtA++W7CChA yuEQ== X-Forwarded-Encrypted: i=1; AFNElJ8/d5UKQ3StFkqISlRWt0oj8cuENktRuS2FuCd7SX8dpZRdD0MfJIzRr7wVI//6BPWIH081I6sQSxEO8A==@vger.kernel.org X-Gm-Message-State: AOJu0YyqZ8xy/eX119jBJpB/vQ7tPl10/sYWw7KatdrHYABiz4C7Ge8P lpnGEmy52ZgTKGVdOXuSfHx2ozCx2LcwUeh48/ADKn2lOlT8x52POC0gQEnjOEYj4O26L3jTKK9 9Teq2i0ySDmj5aVRLkhn/qCGhpUq9Zvj7clvg0RdtgPVlYaz362wnOoaz8Qo= Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:208b:b0:69e:f61e:6a43 with SMTP id 006d021491bc7-6a0b616473bmr7078294eaf.46.1781788824337; Thu, 18 Jun 2026 06:20:24 -0700 (PDT) Date: Thu, 18 Jun 2026 06:20:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a33f098.537e895e.3cc275.0002.GAE@google.com> Subject: [syzbot] [media?] WARNING: ODEBUG bug in cec_transmit_msg_fh From: syzbot To: hverkuil@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e21ee273e6fa Merge tag 'clk-fixes-for-linus' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17340bd2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e828c596d7aa593 dashboard link: https://syzkaller.appspot.com/bug?extid=051024d603432b4ab395 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/14fcc3decf4c/disk-e21ee273.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e80c98de356/vmlinux-e21ee273.xz kernel image: https://storage.googleapis.com/syzbot-assets/2a12732e35df/bzImage-e21ee273.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+051024d603432b4ab395@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff888025d28cb8 object type: timer_list hint: cec_wait_timeout+0x0/0x180 include/media/cec.h:-1 WARNING: lib/debugobjects.c:632 at debug_print_object lib/debugobjects.c:629 [inline], CPU#1: syz.0.3204/21212 WARNING: lib/debugobjects.c:632 at __debug_check_no_obj_freed lib/debugobjects.c:1154 [inline], CPU#1: syz.0.3204/21212 WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x358/0x530 lib/debugobjects.c:1184, CPU#1: syz.0.3204/21212 Modules linked in: CPU: 1 UID: 0 PID: 21212 Comm: syz.0.3204 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:debug_print_object lib/debugobjects.c:629 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1154 [inline] RIP: 0010:debug_check_no_obj_freed+0x39c/0x530 lib/debugobjects.c:1184 Code: 48 89 04 24 e8 a5 b8 75 fd 48 8b 04 24 4c 8b 4d 00 4c 89 ef 48 c7 c6 e0 9f 28 8c 48 c7 c2 60 a5 28 8c 8b 4c 24 1c 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 10 48 b9 00 00 00 00 00 fc RSP: 0018:ffffc90005ac78a0 EFLAGS: 00010246 RAX: ffffffff87e83c30 RBX: ffffffff9a6fa8b8 RCX: 0000000000000000 RDX: ffffffff8c28a560 RSI: ffffffff8c289fe0 RDI: ffffffff903a7340 RBP: ffffffff8bcf39c0 R08: ffff888025d28cb8 R09: ffffffff8bcf4d20 R10: dffffc0000000000 R11: ffffffff81b1a1f0 R12: 0000000000000001 R13: ffffffff903a7340 R14: ffff888025d28000 R15: ffff888025d28cb8 FS: 00007f6b13bf26c0(0000) GS:ffff8881253b9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa101deb078 CR3: 000000008a112000 CR4: 0000000000350ef0 Call Trace: slab_free_hook mm/slub.c:2620 [inline] slab_free mm/slub.c:6251 [inline] kfree+0x13e/0x640 mm/slub.c:6566 cec_transmit_msg_fh+0x16f0/0x24d0 drivers/media/cec/core/cec-adap.c:988 cec_transmit drivers/media/cec/core/cec-api.c:230 [inline] cec_ioctl+0x2020/0x3060 drivers/media/cec/core/cec-api.c:534 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6b1619ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6b13bf2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6b16416360 RCX: 00007f6b1619ce59 RDX: 00002000000000c0 RSI: 00000000c0386105 RDI: 0000000000000006 RBP: 00007f6b16232d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6b164163f8 R14: 00007f6b16416360 R15: 00007ffdafcf65c8 ---------------- Code disassembly (best guess): 0: 48 89 04 24 mov %rax,(%rsp) 4: e8 a5 b8 75 fd call 0xfd75b8ae 9: 48 8b 04 24 mov (%rsp),%rax d: 4c 8b 4d 00 mov 0x0(%rbp),%r9 11: 4c 89 ef mov %r13,%rdi 14: 48 c7 c6 e0 9f 28 8c mov $0xffffffff8c289fe0,%rsi 1b: 48 c7 c2 60 a5 28 8c mov $0xffffffff8c28a560,%rdx 22: 8b 4c 24 1c mov 0x1c(%rsp),%ecx 26: 4d 89 f8 mov %r15,%r8 29: 50 push %rax * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: 4c 8b 6c 24 10 mov 0x10(%rsp),%r13 38: 48 rex.W 39: b9 00 00 00 00 mov $0x0,%ecx 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 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