https://bz.apache.org/bugzilla/show_bug.cgi?id=65755
Mark Thomas <ma...@apache.org> changed:
What |Removed |Added
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Status|NEW |NEEDINFO
--- Comment #3 from Mark Thomas <ma...@apache.org> ---
Thanks for the background. Sometimes that provides enough information for us to
be able to identify a possible root cause. Unfortunately, that doesn't seem to
be the case in this instance.
I have also reviewed the change log from 8.5.43 to 8.5.64 and don't see any
likely candidates.
Can you confirm you are not using HTTP/2?
This type of issue is always very sensitive to timing. It could be that you are
seeing a bug introduced between 8.5.43 and 8.5.64 that was then fixed between
8.5.64 and 8.5.73. What I suspect is more likely is that the bug has been
present all the way through and that the changes in Tomcat changed the timing
which in turn changed how likely it was that you saw the bug.
Since you are on Linux, it would be worth testing to see if your system is
susceptible to this bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1924298
There is a C test application attached to the linked Java bug along with
instructions (using wrk) on how to reproduce the issue. If you do see
duplicated accepts that might be an explanation for this issue.
What we really need is a reproducible test case. Once we have that I am
confident we'll be able to find the root cause and fix it (if it is in Tomcat).
The more reliably the test case reproduces the issue, the quicker we'll be able
to fix it. Generally, it is less about how many requests it takes to trigger
the issue and more about how quickly the test triggers the issue.
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