From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 1F017347FD7 for ; Tue, 31 Mar 2026 17:17:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774977450; cv=none; b=nnXY2frCUg3jYFbx2vmEdv7JRlT5qek4PFjZ/Gcvmkg7K2noiO+/v0L1QTz1WN5qKQDWIhgLHFuu8R4S+7s33vbrPGhHWBvSAYcR7SwngsqvhVqix7tGIdcXvpPuwICGavXSgkBcgsTXUKXgHtYJWteE+k1NFzFDNSAP7ovQdsg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774977450; c=relaxed/simple; bh=Ij4NctXkH98k4D6pU+jIv/fxlb6S2F9PSm7irxHMGPo=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=U1C3jLeSmTtx3xlry8GdTobTg0wGXhQWx8nfX7uPUzhu/ccsVtQmyNlWKTAiHOEHqfHOd7wxJMJxKMopnABEW7dHZhkr0QnKC0FzelD+CuKLy+W2dQREbgSrhP6vDKlDruKmB44/za3X/y4n0ncJTFw0xl/XrX/lH/HK3vRMuOA= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-67df4623e1bso20818339eaf.0 for ; Tue, 31 Mar 2026 10:17:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774977448; x=1775582248; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=hteMWmC5zuwxY1wca9+Xqy4IWjKYX39OfCnF/7yj5mU=; b=SNbB4c79vIDttDiHcDQ0pWEWSFVX2/+YKADBFArT7wtwWGtf8wEevGLMd+yhxmEHoq bUEqYnl5f86P7o29P50DQzqhq5e73aFL6b+DVlo2pFRAtokJyRRKBVs2lSIZzm5iy7f0 Q+FqFvpY4hp81nQQDyAHge6cIMh/bM6cwCOvLos5oGOpHVPlI4u3zmqhzlhEFhzIPwMW qcmm2MeFlhjFHjgYgcvVVDAGGUXwRba5uLV/kK1SgOEMdwd28vj40slLra3nCGvi4zVh PslMKg3jDofEGlObmc3CFpwdRGSZJxoDWZQxafvkYdvXFe4ABD2LBrZrsinR8AexbBxd jhkw== X-Forwarded-Encrypted: i=1; AJvYcCXMfCkzzlqkd1MPrEGti7tWsbGrMecFjrRnAr35DY7sItgZ9k3AN1LhHm+B0vWXwiO6uVdf0aPAl9R+IJQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyC56QwV4cH2+/c0uUGpUsVVkLz1hOxFinqE8s+dHgocemtJI4X QQGjDIxR1uP4X1wyZnGbIEpkWZKwn65qjvHxnFee9Ndm8lVlwUxL2ycYThFO/JE6B4b3VTyix2x oOcdqcWhw9myzdvJzVD/qNSxCvMwBjsYGKPmeVuvjxHvAx9YhEmWNdEDncFQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2d03:b0:67b:c122:d2c8 with SMTP id 006d021491bc7-67fabc982c6mr14767eaf.39.1774977447940; Tue, 31 Mar 2026 10:17:27 -0700 (PDT) Date: Tue, 31 Mar 2026 10:17:27 -0700 In-Reply-To: <000000000000bd671b06222de427@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69cc01a7.050a0220.183828.002d.GAE@google.com> Subject: Re: [syzbot] [net] INFO: task hung in tun_chr_close (5) From: syzbot To: andrew+netdev@lunn.ch, andrew@lunn.ch, davem@davemloft.net, edumazet@google.com, jason@zx2c4.com, jasowang@redhat.com, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, mail@country-targeted-traffic.com, netdev@vger.kernel.org, newsletter@monkeydigitaldeals.com, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, vinicius.gomes@intel.com, willemdebruijn.kernel@gmail.com, wireguard@lists.zx2c4.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 47ab2c12c87a Merge branch 'correct-bd-length-masks-and-bql.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=153aed02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6754c86e8d9e4c91 dashboard link: https://syzkaller.appspot.com/bug?extid=b0ae8f1abf7d891e0426 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1286e8d2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=106df5da580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/289234295ce6/disk-47ab2c12.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b3f30eb7dc01/vmlinux-47ab2c12.xz kernel image: https://storage.googleapis.com/syzbot-assets/62a0f5642c08/bzImage-47ab2c12.xz The issue was bisected to: commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 Author: Vinicius Costa Gomes Date: Sat Sep 29 00:59:43 2018 +0000 tc: Add support for configuring the taprio scheduler bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11535418580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=13535418580000 console output: https://syzkaller.appspot.com/x/log.txt?x=15535418580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b0ae8f1abf7d891e0426@syzkaller.appspotmail.com Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler") INFO: task syz-executor:5978 blocked for more than 143 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:22400 pid:5978 tgid:5978 ppid:1 task_flags:0x40054c flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7065 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776 tun_detach drivers/net/tun.c:634 [inline] tun_chr_close+0x3e/0x1c0 drivers/net/tun.c:3436 --- 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.