https://bz.apache.org/bugzilla/show_bug.cgi?id=65448

--- Comment #9 from Mark Thomas <ma...@apache.org> ---
Thanks for all the information. 

That you still see the issue with 9.0.48 means that the response buffer
flushing changes in 9.0.49 are not the root cause of this issue.

That the observation of the issue is limited to NIO+OpenSSL and not (NIO+JSSE,
NIO2+OpenSSL or NIO2+JSSE) suggests where the root cause may lie but it is
possible that NIO+OpenSSL just happens to have the right timing to trigger an
issue that could affect other combinations.

Similarly, that using sendfile appears to avoids the issue suggests where the
root cause may lie.

I will set up a Windows 2019 VM to see if I can reproduce this.

Meanwhile, could you test with 9.0.46? There were some NIO changes between
9.0.46 and 9.0.48 it would be helpful to rule in/out.

And another question. Can you recreate this with debug logging enabled?
Specifically with the following in logging.properties:
org.apache.coyote.level = FINE
org.apache.tomcat.util.net.level = FINE
If yes, please provide a copy of the debug logs for when the issue occurred.

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