netdev - Fw: [Bug 219221] New: TCP connection/socket gets stuck and the handshaking is delayed

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Message-ID: <20240902084335.1e048358@hermes.local>
Date: Mon, 2 Sep 2024 08:43:35 -0700
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Subject: Fw: [Bug 219221] New: TCP connection/socket gets stuck and the
 handshaking is delayed

Begin forwarded message:

Date: Mon, 02 Sep 2024 14:25:13 +0000
From: bugzilla-daemon@...nel.org
To: stephen@...workplumber.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@...workplumber.org
          Reporter: zbal1977@...il.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

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