https://bz.apache.org/bugzilla/show_bug.cgi?id=66476
Bug ID: 66476
Summary: org.apache.tomcat.util.net.Acceptor.run Socket accept
failed java.io.IOException: Duplicate accept
detected.
Product: Tomcat 9
Version: 9.0.58
Hardware: PC
OS: Linux
Status: NEW
Severity: critical
Priority: P2
Component: Connectors
Assignee: dev@tomcat.apache.org
Reporter: patkarom...@gmail.com
Target Milestone: -----
Hello,
Sometimes we see below error in our tomcat log file, and when this happens
tomcat stops accepting any more requests : -
----------------------------------
ERROR: -
----------------------------------
10-Feb-2023 02:16:19.618 SEVERE [http-nio-80-Acceptor]
org.apache.tomcat.util.net.Acceptor.run Socket accept failed
java.io.IOException: Duplicate accept detected. This is a known OS bug.
Please consider reporting that you are affected:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1924298
at
org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:548)
at
org.apache.tomcat.util.net.NioEndpoint.serverSocketAccept(NioEndpoint.java:78)
at org.apache.tomcat.util.net.Acceptor.run(Acceptor.java:129)
at java.lang.Thread.run(Thread.java:748)
----------------------------------
Apache Tomcat version : - Apache Tomcat/9.0.58
Frequency of occurance : - Sometimes
Reproducible consistently ? : - No, it appears sometimes ....randomly...and on
tomcat restart it goes away but it may appear randomly sometime later
OS = CentOS
Kernel (uname -sr) = Linux 6.0.9-1.el7.elrepo.x86_64
Server arch = amd64
Setup: -
We are using Camunda 7.16 BPMN tool which comes with inbuilt Apache Tomcat
9.0.58. This is deployed on our Linux VM (CentOS). The VM is within our company
network, and ... via company's firewall another trusted application on Azure
cloud (outside company network)...is only allowed to make REST API calls to
Camunda (hosted on Tomcat). When Tomcat is started all works fine, requests
placed from trusted application on Azure Cloud are able to reach our Tomcat and
our application works on it, until out of the blue and randomly above error
occurs and tomcat no longer serves request coming from external application on
cloud.
On the other hand, if we fire similar request from within our company network
machines as many times as we want... as frequently as possible, in such
scenario, the above error does not occur and Tomcat allows all requests.
In other words, it seems above issue occurs only for external requests and not
internal ones.
What has been tried so far ?: -
>From several posts after google search it was found that Linux Kernel version
could help. Previously it was 3.x and now it is upgraded to 6.0.9-1 and Apache
Tomcat version is 9.0.58... still we face the above error.
Queries: -
1) Why it behaves strangely with external requests and not with internal ones ?
2) How can we consistently reproduce the issue ?
3) What could be the possible cause and how to fix it ?
Any help in this regard can be very helpful.
Let me know if you need any more information.
Thanks and Regards
Omkar Patkar
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