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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d22e66d8f4sm7701159a12.0.2024.09.02.08.43.36 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Sep 2024 08:43:37 -0700 (PDT) Date: Mon, 2 Sep 2024 08:43:35 -0700 From: Stephen Hemminger To: netdev@vger.kernel.org Subject: Fw: [Bug 219221] New: TCP connection/socket gets stuck and the handshaking is delayed Message-ID: <20240902084335.1e048358@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: Mon, 02 Sep 2024 14:25:13 +0000 From: bugzilla-daemon@kernel.org To: stephen@networkplumber.org Subject: [Bug 219221] New: TCP connection/socket gets stuck and the handshaking is delayed https://bugzilla.kernel.org/show_bug.cgi?id=219221 Bug ID: 219221 Summary: TCP connection/socket gets stuck and the handshaking is delayed Product: Networking Version: 2.5 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: IPV4 Assignee: stephen@networkplumber.org Reporter: zbal1977@gmail.com Regression: No Created attachment 306806 --> https://bugzilla.kernel.org/attachment.cgi?id=306806&action=edit working TCP connection PCAP file Hi, We have a client/server application which is developed a long time ago. It has been running in production for more than 10 years. The client is a Windows application written in C++, and the server-side component is written in Java8. This client/server software has been working fine for a long time on Linux servers. Currently, we use AlmaLinux 9. It was working on AlmaLinux 9 until updating the kernel. So, when we update the Linux kernel from "5.14.0-362.13.1.el9_3.x86_64" to "kernel-5.14.0-427.31.1.el9_4.x86_64" the application gets unstable: The client drops the connection based due to not receiving messages in the proper time. We notice delays, the client just waiting for the response from the server. The issue is always reproducible with the new kernel. And if we go back to the old kernel, the problem is gone. We kept running the test for hours in both cases. I attach the PCAP file created on the working system running with the old kernel (5.14.0-362). Additionally, I attach another PCAP file created on the non-working system. The difference is the kernel (5.14.0-427). All other components are the same. Please analyze it and let us know how to fix it. Whether it is a general issue in the Linux kernel, or only AlmaLinux distro suffers from that. Thanks a lot! Regards, Zoltan Balogh -- You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.