Re: Duplicate accept detected. This is a known OS bug.

Mark Thomas Wed, 09 Feb 2022 12:08:42 -0800

On 09/02/2022 19:35, jonmcalexan...@wellsfargo.com.INVALID wrote:

Thanks Mark,


This team is has Some of the apps running on PCF and also running both JAVA 8 
and JAVA 11. This is using Oracle Java on RHEL 7.9.

In reading through the activity log on the bug report, it appears that it's 
being seen on multiple Linux distros as well as on Windows. This feels like 
something at a fundamental root, but at what actual level?


Linux.

The Windows reports are false positives. I'm currently looking at how tofilter those out.


If you are using RHEL then I'd suggest:
- use the C test case from that bug to confirm the issue with your OS
- raising this as an issue with RedHat

Mark


Thanks,

Dream * Excel * Explore * Inspire
Jon McAlexander
Infrastructure Engineer
Asst Vice President

Middleware Product Engineering
Enterprise CIO | EAS | Middleware | Infrastructure Solutions

8080 Cobblestone Rd | Urbandale, IA 50322
MAC: F4469-010
Tel 515-988-2508 | Cell 515-988-2508

jonmcalexan...@wellsfargo.com
This message may contain confidential and/or privileged information. If you are 
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-----Original Message-----
From: Mark Thomas <ma...@apache.org>
Sent: Wednesday, February 9, 2022 12:02 PM
To: users@tomcat.apache.org
Subject: Re: Duplicate accept detected. This is a known OS bug.

On 09/02/2022 17:54, jonmcalexan...@wellsfargo.com.INVALID wrote:

Hi all,

I have an application team occasionally getting the following exception with

their application. They are currently using Tomcat 9.0.56. I'm not finding much
on the intertubes in regards to this. Does anyone have any information?


org.apache.tomcat.util.net.Acceptor run
SEVERE: Socket accept failed
java.io.IOException: Duplicate accept detected. This is a known OS
bug. Please consider reporting that you are affected:

https://urldefense.com/v3/__https://bugs.launchpad.net/ubuntu/*source/

linux/*bug/1924298__;Kys!!F9svGWnIaVPGSwU!-

gTVrWxM1UlX26aYBCXFXX76_g8g

E1EwzxIvjtqNJZi6xecg6YS_HhNx3iwYnanI-GXZ-4Y$


That bug and the Java issue linked from it should answer most questions.
The linked Spring bug is generally interesting but doesn't shed much light on
this issue.

What do you want to know that they don't address?

Mark

at

org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.ja
va:545)

at

org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.ja
va:78)

          at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:129)
          at java.base/java.lang.Thread.run(Thread.java:834)


Thanks,

Dream * Excel * Explore * Inspire
Jon McAlexander
Infrastructure Engineer
Asst Vice President

Middleware Product Engineering
Enterprise CIO | EAS | Middleware | Infrastructure Solutions

8080 Cobblestone Rd | Urbandale, IA 50322
MAC: F4469-010
Tel 515-988-2508 | Cell 515-988-2508

jonmcalexan...@wellsfargo.com<mailto:jonmcalexan...@wellsfargo.com>

This message may contain confidential and/or privileged information. If you

are not the addressee or authorized to receive this for the addressee, you
must not use, copy, disclose, or take any action based on this message or any
information herein. If you have received this message in error, please advise
the sender immediately by reply e-mail and delete this message. Thank you
for your cooperation.


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Re: Duplicate accept detected. This is a known OS bug.

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