From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 0F6E0334C24 for ; Mon, 1 Dec 2025 17:08:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764608919; cv=none; b=LOT6FuiqCEqp6ubTIGn5ibcMgNswYpjE/3/510cv93NgU4asJmayimsVTRQRn90efK77pKAnEDKqEE1ofdLxKALHoUQcnT5K3PFYIq0hQGcZL/smt8hW3af5nRlPcvHLt2BINwgIIza6mEQ/hHWOtQyg+tu2/JW081IMbowYmFQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764608919; c=relaxed/simple; bh=bBXkacKZ3dPPSO1kOOntC9FmsUogIrenh6VYlbtFTxg=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=vFrUKTULBttLxbadJkXRzLAEwm1XgXtfcx/OlTMIPFdGD8xgJQlTg4RzclPI93tZHAOJ7/lGl7MIGMAdoieGMoeJKbBgkvti/Z5lHwvhWlBEUKwSpflDP/lpv6L0OmISRStGwk0WxRr7Gc2oXVEeoB08k4erDKm9hPFjOWa/2/E= 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=209.85.167.205 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-oi1-f205.google.com with SMTP id 5614622812f47-451064d84edso946014b6e.3 for ; Mon, 01 Dec 2025 09:08:37 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764608917; x=1765213717; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=IGgw4cmQSTUXMDHP6hSXGRUhINvpMa94Hp04p38gdUQ=; b=cBcCw5mzJsOuqZQTLs82CBhsM9uucJFrpF37+JnygPBOMVqxNTv+044+I/2JT7Tp+9 FtlbG4N2VyzOq6G1LzLfOEgWvVEaREQudjBjy8/tcKMCbcI6Ghm4MctIiJVM2n8GCEOC 6d+9FDOsNyNUrGHw/T7On+T0bi5b6qQovfgZZOtV31LLF60SoSoD7I8QQM7swD4Ig/XT R8uEz0czogcfa8ELakE5oRN7vq9OYXdnGDtr+MT+YnKIxEvWxHf75Qa1yjnyM+4XXR/e uRhcAhllhGj3V7+cvDxU4aP5OnX30X0/ROVg/1k9+jWZUJirWnME0bOC+CRO9H3YSPaS 1cwA== X-Forwarded-Encrypted: i=1; AJvYcCVUJwYO4et0elAkdeeuSH5ZSxyc43JsGFiL8jTu0KR7X8dgMzzm+VNClVKMo1GmTusvPXs1iH8=@vger.kernel.org X-Gm-Message-State: AOJu0YwjVUyf1h1YxLVvWgIOwYMqT2sVD8VCNhjLKmrjQXc5fq7HC1v6 23ezHdv85Ac92UPuJmt8zqXt2RrozA8u0yBhWaypv0XOoKfDsR2dpLarGI2PQLNy9IpvkRAM6TO S0UO/R31Ds0GqYDr50W8dKh25p5cFIITUx8eJJuAKWB2PctvctAVjbrRKZ84= X-Google-Smtp-Source: AGHT+IH9NuFruHmgK/3D/rVbGU7t6FAooCbOPK47woHfGrJ9gVgHedVFHG3uvO9GUzJhQf2rwRrYEU0KFR8lwlyYUSPCcRzfjuvy Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:3448:b0:450:4628:e3f2 with SMTP id 5614622812f47-4514e7a4293mr11442006b6e.42.1764608915594; Mon, 01 Dec 2025 09:08:35 -0800 (PST) Date: Mon, 01 Dec 2025 09:08:35 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692dcb93.a70a0220.2ea503.00b6.GAE@google.com> Subject: [syzbot] [bridge?] INFO: task hung in br_ioctl_stub (2) From: syzbot To: bridge@lists.linux.dev, davem@davemloft.net, edumazet@google.com, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, razor@blackwall.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 765e56e41a5a Merge tag 'v6.18rc7-SMB-client-fix' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=159ace12580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1db0fea040c2a9f dashboard link: https://syzkaller.appspot.com/bug?extid=6bdeba54c73aa6a6219d compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ddee12580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-765e56e4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fd649009c819/vmlinux-765e56e4.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf3e0d5c78c2/bzImage-765e56e4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6bdeba54c73aa6a6219d@syzkaller.appspotmail.com INFO: task syz.0.27:5720 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.27 state:D stack:28904 pid:5720 tgid:5719 ppid:5469 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 br_ioctl_stub+0x199/0xc80 net/bridge/br_ioctl.c:418 br_ioctl_call net/socket.c:1227 [inline] sock_ioctl+0x4d8/0x790 net/socket.c:1329 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+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f91bf78f7c9 RSP: 002b:00007f91c0675038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f91bf9e5fa0 RCX: 00007f91bf78f7c9 RDX: 0000200000000000 RSI: 00000000000089a2 RDI: 0000000000000003 RBP: 00007f91bf813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f91bf9e6038 R14: 00007f91bf9e5fa0 R15: 00007ffd440d2c68 INFO: task kworker/u4:11:5722 blocked for more than 150 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:11 state:D stack:28872 pid:5722 tgid:5722 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: events_unbound linkwatch_event Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 --- 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