From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-180.mta1.migadu.com (out-180.mta1.migadu.com [95.215.58.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE01437DAC2 for ; Wed, 3 Jun 2026 05:36:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780464971; cv=none; b=gNh85u6mSiXw6TMKaYpjY9/uwm7sk7fORrSl/1/0CHq5cJ2hIhcJjAS+twqFfjyj+N1ccYLmTQbnFd479s3XmEFosYrtfC/7ENeK6cDO6wpEeo90BwSAe5xp+zRPODgYEqfOSLEKUL4WtmOwc1r2tKTRtTgOb31212+65c7bIgk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780464971; c=relaxed/simple; bh=QZdWL8TW93hBVmRCbf+wTaax3/MrgBmqC4IKbOxsDW4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=h11m0Q4qZZckp2GoieXpAP6LU7cGkiCN3qEZGoqFHN+r7gtVnVfJ/8CveCMyiAdH0gE59w70aVT1n6w3z3WvhejN86gEJvs72P48Xb+ZbZck75bKMfd9QI7ZyigHnpxI/7EgZjDBiDj8hpvY92pbcHo0ZFjmI6RhR0x4dMgVYLI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=pKT1gyCR; arc=none smtp.client-ip=95.215.58.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="pKT1gyCR" Message-ID: <752224bd-bada-4729-846a-c5684de38101@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780464954; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=a7v3/xj0c3pZJZawiq+jPLnhvqm6ys3j0ue/XKbnFgQ=; b=pKT1gyCR+Ei4hlApb7vqQMC2wJtAwBBWeZ+eO+LXf/dK4zrC14XL0hmcapFQpyJsCc97hI 9+g7Vkg6nFJfLDKTDvj4kDweb0q/0/TpZ/+3ri3hgGz8mGbgQnle8QRwO6XrfsQ4AB28fy eEgwzMEboRadZZTekCcd76QPabN/paQ= Date: Wed, 3 Jun 2026 13:35:43 +0800 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH net-next v2] selftests: net: add socat syslog for PPPoL2TP To: Matthieu Baerts Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan , linux-ppp@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260529021146.5739-1-qingfang.deng@linux.dev> <8233aae4-42d4-4fac-90aa-240fadd9a39b@kernel.org> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Qingfang Deng In-Reply-To: <8233aae4-42d4-4fac-90aa-240fadd9a39b@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT On 2026/6/3 12:04, Matthieu Baerts wrote: > Hi Qingfang, > It looks like the issue happened once since this patch is being tested: > > https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-extra/results/668501/11-pppol2tp-sh/stdout > > Is it enough for you to understand what's wrong and how to fix it? Yes. Both pppd instances detected a false loopback, possibly because they happened to use the same PRNG seed to generate the magic number. I'll send a patch to disable this detection. Regards, Qingfang