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[152.2.130.143]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b166eb16d0sm28482337b3.39.2026.10.26.01.47.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Oct 2026 01:47:28 -0700 (PDT) From: Hengyu Liang To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, jchapman@katalix.com, tparkin@katalix.com, gnault@redhat.com Subject: Re: [PATCH net] l2tp: only return sessions of the given tunnel in l2tp_session_get() Date: Mon, 26 Oct 2026 04:47:16 -0400 Message-ID: <20261026084716.2884624-1-hengyul@cs.unc.edu> X-Mailer: git-send-email 2.53.0 In-Reply-To: <179294048471.3327.7148108321076866901@kernel.org> References: <179294048471.3327.7148108321076866901@kernel.org> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi, I found this while comparing the behaviour of different kernel versions: connect() on a PPPoL2TP socket for a second L2TPv3 tunnel succeeds on v6.8 but fails with EEXIST on v6.18. I then bisected it to the IDR session lookup series (5f77c18ea556, d18d3f0a24fc) and checked the "ip l2tp" commands in the commit message by hand on both sides. Thanks, Hengyu