From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f72.google.com (mail-io1-f72.google.com [209.85.166.72]) (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 472511853 for ; Wed, 3 Sep 2025 03:12:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756869125; cv=none; b=WXgN2RSCkSGMvOIeQYbdPRgDvXh46rtsmwImQIeo2t3ihhrMPOv5dLMEvgvyP27KC/puPw/pvjVn1wO7n8EvT6OCK7ezxhNeYAlhGqn8bHsh0+YetGdh9kxta0lZj+B97hv9MyMxJZzhJbxMSMEk42tJvsSxDiFFzLMyxd3ICuw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756869125; c=relaxed/simple; bh=gtxfPgdfCcDqfNt0Kq2nSCJXZnm3SosKEAP1U/WHuVk=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=M7+Oy5dyOPaE8NEuBwIuvRVjDlLUscmMg3eRHJi51Ee/zuz5NYY09a7YeADiD9GPbYQuSmquW151ahhkNPOkn3hh0Ff2E/VH/pYM2GxnUe4B73NSXhkTEHmkYFhQraVcRiQHT+9yYtI9DaLgTqHeFcDN7z8/NmoZOQ4LIJhIe4Y= 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=209.85.166.72 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-io1-f72.google.com with SMTP id ca18e2360f4ac-88731310ba4so517304239f.3 for ; Tue, 02 Sep 2025 20:12:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756869123; x=1757473923; 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=hm2aJaDhNN5sGIQhrQ224nx++sFWDSMjycRjNz9pSJc=; b=vnrDqVw52Bo++aXAwk8EMlIyYDhJv1mFXykD0uNqGV0eqNU+n2+sQtzFiI015WWD+H qHXnAWcpmaVcppR0Vr22lwgBHMFVzZ6C0+C3w9em5G8R0ZON8oaw+QsTkmisXo8nXVmx J/TUHh1Dxl5X2g4xkCfQwcQa8T5k/gJTQO6pmWjnjDWjSEr0O5wl50NVvaWC/m+YN5u0 558hBogKl5vOG73oX94Jmdgb/jV1Emca2BgJEpEhVj1YYZYsT4SZ9JiVAeFg5Ixz4fcn DFr8wkvM/EJffYLmu953Nqt6PvKelhI+wajnsjGC5rHLo/+qFbreLC/2sgXwNqXrgcRb IwjQ== X-Forwarded-Encrypted: i=1; AJvYcCVJaM1owAO0Bfrv/ihY3J0WXlnA96whODtrJF7ZG76WWJ3FlAhxKLaY0YJCL45UhAbwtsbblAABb0pVQBs=@vger.kernel.org X-Gm-Message-State: AOJu0YzRkYn0aZcEQzWe4uAzeAh4gaa6lqrSE7TKFp4Gxp3RIJIGZXq3 l2/f5CLPz0F4tTcn4Id8EVUWIAD6quZ9UBTlN6qLTSdhA7Kxs2zfnnlqf8wQcTN6ViV1Xj9mXUY AdPvwkcd6AnJJvyeO4Wfa3NESL8A3Jy6fjfw/KWFIE8gfELlHF/Mym5/SD70= X-Google-Smtp-Source: AGHT+IEVsrZE15aNeOVQXXUA0qrctLufM/J9xZFzOsUMcbMkY8wW6aJYnqe1onAQKO1ozPr/BKc+k6QYQGRtaf8PlHKZWwOg1l1X Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1486:b0:3ef:d092:c07d with SMTP id e9e14a558f8ab-3f401be28abmr248105625ab.16.1756869123406; Tue, 02 Sep 2025 20:12:03 -0700 (PDT) Date: Tue, 02 Sep 2025 20:12:03 -0700 In-Reply-To: <20250903023326.6389-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68b7b203.050a0220.3db4df.01e4.GAE@google.com> Subject: Re: [syzbot] [block?] [mm?] INFO: rcu detected stall in wb_workfn (4) From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: task hung in linkwatch_event INFO: task kworker/u8:0:12 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:24856 pid:12 tgid:12 ppid:2 task_flags:0x4208060 flags:0x00004000 Workqueue: events_unbound linkwatch_event Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7058 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760 linkwatch_event+0x51/0xc0 net/core/link_watch.c:303 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236 Tested on: commit: e6b9dce0 Merge tag 'sound-6.17-rc5' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13236e62580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d4703ac89d9e185a dashboard link: https://syzkaller.appspot.com/bug?extid=5b4f4f81240931b16844 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=15af4312580000