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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2c2806946adsm1656915a91.25.2024.06.05.09.06.36 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Jun 2024 09:06:36 -0700 (PDT) Date: Wed, 5 Jun 2024 09:06:35 -0700 From: Stephen Hemminger To: netdev@vger.kernel.org Subject: Fw: [Bug 218937] New: TCP connection frozen on sender and receiver. No retries beyond 1. Message-ID: <20240605090635.30c22c8b@hermes.local> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Begin forwarded message: Date: Wed, 05 Jun 2024 06:26:40 +0000 From: bugzilla-daemon@kernel.org To: stephen@networkplumber.org Subject: [Bug 218937] New: TCP connection frozen on sender and receiver. No retries beyond 1. https://bugzilla.kernel.org/show_bug.cgi?id=218937 Bug ID: 218937 Summary: TCP connection frozen on sender and receiver. No retries beyond 1. Product: Networking Version: 2.5 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: Other Assignee: stephen@networkplumber.org Reporter: joysonanuit@gmail.com Regression: No Created attachment 306413 --> https://bugzilla.kernel.org/attachment.cgi?id=306413&action=edit sender pcap screenshot Hi, i am facing an issue in TCP. At a random point in packet transfer, sender stops retrying and receiver stops acking. our previous kernel was 2.6 and current kernel is 5.4. the sequence of events are as below. sender: sends few packets of data. misses a few ACKs. retries again. does not get an ack. stops receiver: receives the packets. sends ack to only few packets. does not retry ack for the remaining packets. for this FIN, the sender sends RST. there is a timeout at receiver end which forces the socket to be closed. this erroneous socket reaches the end of timeout and sends a FIN with ACK of all the data that it has received(including the ones that it did not ack and the sender was waiting for) -- You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.