From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (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 D2AB52367AF for ; Fri, 30 May 2025 17:27:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748626026; cv=none; b=nZUf+/oVW88nwjvZzAXx0ETIichRPy058V+v9qXGEdpGmZ4/DfRAE3RP+oyxCOFGn4lm+wZEe2CFG6dh6hjXzhz14gxpqfzwvD2zM/1PykqmJzDCdTzd0RLbbwTPPczpLJLFgz2lqLbbZhftHRBWUe5XxtbHm/szfOWjhnSiXUM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748626026; c=relaxed/simple; bh=QnFT4UTcUmVIF557XHeZIxprQLC4uimKa9zu22sXfkw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=StsB+VG41qdPYRtFCNjR9PQ8VeN1pgAbgtptIJGHpUe2QBuY84Jvo0KM5qyNFkN4Sm9CQYjulCdFQkQJXrwDITgi2/SEu/PdkPtXZ7ls342sZW+ay13hyvgQZf8A5m0jH3BmBcDY6RYNxiueJFQg8gCeo6y3YQ76HK11P6R5hAw= 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=209.85.166.197 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-f197.google.com with SMTP id e9e14a558f8ab-3dd81f9ce43so25014275ab.0 for ; Fri, 30 May 2025 10:27:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748626024; x=1749230824; 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=PEnE3UPKhcy+AwEGJgtE9Olu+DiLoFVrDFd7ZrO9MFg=; b=GfF9C55F5cwj4fhdZjobIZV6j6U7O1m7frgFfOIGOcZyddG4ESSHlKcPwqehdbY/CB SG4KtjyiRf+GORcNNmlx64OtfOpUQREbtsN/7NDgZ/T98A2RswR+lKIUt2wbHj7Bs+4q 5rVEHFtFjWWo0yWppCW/mcOovt9JjqK9NPqZwOGz0a3aT+rVzYB1BrN3uWVrTGotrlQO O7ntBx48eyopB7CzQ5VuzPsitIRPbBNoxoA44xo+N8TMl/6URpkSncC4VHyoD4nCgse5 XOvtbZFX8C3U/WRgpVSbV7ydzjA1UE4kwD6g0BKzOrdSGbhoWFcMzrKXb7MWi5twdcnq X3Mw== X-Forwarded-Encrypted: i=1; AJvYcCUKvCXlE2tQoGTprpqrk7eOjMC3sMo/rIJXKc2L+9ZM3NyWRw9GHYW94VR2PrqvfB6E5vSatoA=@vger.kernel.org X-Gm-Message-State: AOJu0YzvB0ng/iYkSJpWCeXNyQy/f4Cy5rFNt8TrAsl4wwXmzewKxX9N th1xrbHva/oDsGRnyCI4mviGmccoHXU2gKLpMfPXts9BKg7lPOMSY9aj4qB5yGL7+BjkA3ZC0Mz ZSK6FTrgenm5g9SjGY5S9ZutH8+qUfGW7GH5K2mK7mIZpwarjMk+zmp5PbzQ= X-Google-Smtp-Source: AGHT+IGLEwYnF4NLSDCGONGXRq9cSsMDPGPvX/rO+eobb5oy+6F/LXDkf3vpZt1ktE3onG9mjJtHCD8NWls3pJa9JWvUafFgsj94 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2789:b0:3d9:6cb6:fa52 with SMTP id e9e14a558f8ab-3dd99bf713dmr49207495ab.12.1748626023784; Fri, 30 May 2025 10:27:03 -0700 (PDT) Date: Fri, 30 May 2025 10:27:03 -0700 In-Reply-To: <87r006nj7e.fsf@posteo.net> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6839ea67.a00a0220.d8eae.000c.GAE@google.com> Subject: Re: [syzbot] [net?] WARNING in nsim_fib_event_nb From: syzbot To: andrew@lunn.ch, charmitro@posteo.net, davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, kuniyu@amazon.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, 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: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for lo to become free. Usage count = 601 ref_tracker: lo@ffff888031d42610 has 600/600 users at __netdev_tracker_alloc include/linux/netdevice.h:4330 [inline] netdev_tracker_alloc include/linux/netdevice.h:4342 [inline] netdev_get_by_index+0x79/0xb0 net/core/dev.c:1006 fib6_nh_init+0x1c4/0x2030 net/ipv6/route.c:3590 ip6_route_info_create_nh+0x139/0x870 net/ipv6/route.c:3866 ip6_route_mpath_info_create_nh net/ipv6/route.c:5429 [inline] ip6_route_multipath_add net/ipv6/route.c:5544 [inline] inet6_rtm_newroute+0x8ca/0x1d90 net/ipv6/route.c:5729 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Tested on: commit: a5ecfdd9 ipv6: Fix ECMP validation for multipath routes git tree: https://github.com/charmitro/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1151bff4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5a1787205a40c165 dashboard link: https://syzkaller.appspot.com/bug?extid=a259a17220263c2d73fc compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Note: no patches were applied.