From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (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 27D54214236 for ; Sat, 2 Aug 2025 15:01:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754146865; cv=none; b=ppiwcZTWQgaF0LuPY9x7KinL1KV0rec9J6A3nqA40DNw75H6ZfA2mzt3klxXDLcpCFciYnl0bx0zKRxsaDSISe4DMBtYrda4J0EL3KhQSWrEVqBy2rVxoyy70qPyWqTC4LwyOoiOdpSbCD3pSFjh7dNVqa3WC5N9Lh5IaUC+Zlw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754146865; c=relaxed/simple; bh=EpXsiXDlaAijMIG/2TXsIuAgTscjINiku6LvJ6STKi0=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=NxddcL5u+l7MqgWvV2w3FoIRGIY24AYNvpBaO//ymaIH7o+Hp7HN3OrRwPIk+Kjk1FeWJKSyGj4sy5OH9fwT4Y05NIuTowBWGTe18nE7WyoxyZ9z7fw06bW+yCHvHD01Is1YF0kVxVAka0yR/yGsvhC4abUascdmE47a+tU3eLc= 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=209.85.166.199 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-il1-f199.google.com with SMTP id e9e14a558f8ab-3e3fe1d77ccso17094435ab.2 for ; Sat, 02 Aug 2025 08:01:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754146863; x=1754751663; 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=h/Ecw3FP20+oDYQixIHPpQylVTslIptkPkEbIYt0Lvo=; b=ep7M43u2rUKtKXBqaTtw7aZ/oIpGOjA82Ea1uTN97EFJfE1OvNk2p8BCsndLZrom9q /ktsIJbf1sOLHo+C9Uf2moyrqlbuES8zE3v3KJSzrx9MaPsivBHsW3P48Zo9Hgfahm+1 hM8KuztCuTM094a0VJayJ73kJsPzgm+300nSMCF+7k3FgZNqh1MGM8BQ3KY2rHmKB/Zf /bLrjlqWHeIEGOeWC4Jt9NKRvYQmQtz66dK42+Zcr0UDHgnfTcccDVOIKF1LucrWaFJS wFZJN6LeDA9nKSKc+b+TLb6GGK4toL2h+C4LhPR4MFtBFwFNnLPEm1cDb5isHtM77PCQ 7CMw== X-Forwarded-Encrypted: i=1; AJvYcCUFaCISSPrgXVGjFej0QRcdCKW13G6qCFV+JVlU9Zso/+VyakaEbqIs+a7Q8C9etGjEsZqKs7tpTW8zKVM=@vger.kernel.org X-Gm-Message-State: AOJu0YzF3NjtGYsWJhk+xhKq2bQcGQCulASzZfMSMQvYkZSH53d6lJGK AfSds/yLJ8k7qBZ3dhImj7TKMu8ne1dNXZU1ikmCvu3MOkOueK1H4CqxnODsfN4IqsHjHk4osCU riQDxXKR4sR7aE4mCWUV0F2sI+nYhUPWcdS/KOOmuG46S05+IZ/ueBXUbW4Y= X-Google-Smtp-Source: AGHT+IFiv8g6pWUx4rUWbWQyjoXB0UPEAtgCnjzWk+ld07aZhDICdYrH4MXl7HbUpJyUXdOrr0GR/ibYh9xtsEiFXU4aiBw4HA9k Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3093:b0:3e4:6d6:b436 with SMTP id e9e14a558f8ab-3e41618be54mr73004845ab.12.1754146863239; Sat, 02 Aug 2025 08:01:03 -0700 (PDT) Date: Sat, 02 Aug 2025 08:01:03 -0700 In-Reply-To: <684a39aa.a00a0220.1eb5f5.00fa.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <688e282f.050a0220.81582.0000.GAE@google.com> Subject: Re: [syzbot] [net?] WARNING in __linkwatch_sync_dev (2) From: syzbot To: andrew@lunn.ch, cratiu@nvidia.com, davem@davemloft.net, edumazet@google.com, horms@kernel.org, jv@jvosburgh.net, kuba@kernel.org, kuni1840@gmail.com, kuniyu@amazon.com, kuniyu@google.com, linux-kernel@vger.kernel.org, liuhangbin@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com, sdf@fomichev.me, stfomichev@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has bisected this issue to: commit 04efcee6ef8d0f01eef495db047e7216d6e6e38f Author: Stanislav Fomichev Date: Fri Apr 4 16:11:22 2025 +0000 net: hold instance lock during NETDEV_CHANGE bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13eb22a2580000 start commit: afd8c2c9e2e2 Merge branch 'ipv6-f6i-fib6_siblings-and-rt-f.. git tree: net final oops: https://syzkaller.appspot.com/x/report.txt?x=101b22a2580000 console output: https://syzkaller.appspot.com/x/log.txt?x=17eb22a2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a4bcc0a11b3192be dashboard link: https://syzkaller.appspot.com/bug?extid=b8c48ea38ca27d150063 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11fa74a2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117731bc580000 Reported-by: syzbot+b8c48ea38ca27d150063@syzkaller.appspotmail.com Fixes: 04efcee6ef8d ("net: hold instance lock during NETDEV_CHANGE") For information about bisection process see: https://goo.gl/tpsmEJ#bisection