<div dir="auto">I didn't get time to write standalone program to reproduce it but with new version 3.7.7-Final, i am not able to survive for more than an hour. With the older default xnio version of Undertow (xnio 3.3.8-Final) i can run server for few days until it stops working with error i mentioned in first email.<div dir="auto"><br></div><div dir="auto">Just FYI, i am using OpenJDK 11 with OpenJ9 JVM.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 4, 2020, 10:54 AM Flavia Rainone <<a href="mailto:frainone@redhat.com">frainone@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Can someone provide a reproducer for this error?<div><br></div><div>As for the old version of XNIO, it will be upgraded in Undertow 2.1.0.Final.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 2, 2020 at 8:47 PM Stuart Douglas <<a href="mailto:sdouglas@redhat.com" target="_blank" rel="noreferrer">sdouglas@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hmm, maybe this is a bug in the HTTP/2 close code then, and somehow the connection is not being closed if the client hangs up abruptly. I had a quick look at the code though and I think it looks ok, but maybe some more investigation is needed.<div><br></div><div>Stuart</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 3 Mar 2020 at 03:41, Nishant Kumar <<a href="mailto:nishantkumar35@gmail.com" target="_blank" rel="noreferrer">nishantkumar35@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Yes, i have no control on client side. I am using HTTP2. I have tried increasing open file limit to 400k but that consumes all memory and system hangs. I will probably try to put a nginx in front of Undertow and test.<div dir="auto"><br></div><div dir="auto"><span style="color:rgb(36,41,46);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)">setServerOption(</span><span style="color:rgb(36,41,46);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)">UndertowOptions</span><span style="color:rgb(0,92,197);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)"><span style="color:rgb(215,58,73)">.</span>ENABLE_HTTP2</span><span style="color:rgb(36,41,46);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)">, </span><span style="color:rgb(0,92,197);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)">true</span><span style="color:rgb(36,41,46);font-family:sfmono-regular,consolas,"liberation mono",menlo,monospace;font-size:12px;white-space:pre-wrap;background-color:rgb(255,255,255)">)</span><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 2, 2020, 7:48 PM David Lloyd <<a href="mailto:david.lloyd@redhat.com" rel="noreferrer noreferrer noreferrer" target="_blank">david.lloyd@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Mon, Mar 2, 2020 at 7:56 AM Stan Rosenberg <<a href="mailto:stan.rosenberg@acm.org" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">stan.rosenberg@acm.org</a>> wrote:<br>
><br>
> Stuck in CLOSE_WAIT is a symptom of the client-side not properly shutting down [1].<br>
<br>
I would partially disagree. In the article you linked: "It all starts<br>
with a listening application that leaks sockets and forgets to call<br>
close(). This kind of bug does happen in complex applications." This<br>
seems to be essentially what's happening here: the server isn't<br>
completing the connection (for some reason), stranding the socket in<br>
`CLOSE_WAIT`.<br>
<br>
We can't assume that the client is abandoning the connection after<br>
`FIN_WAIT2` (the titular RFC violation); if the server stays in<br>
`CLOSE_WAIT`, then even if the client dutifully stays in `FIN_WAIT2`<br>
forever, the resolving condition still needs to be that the server<br>
shuts down its side of the connection.<br>
<br>
This diagram is a useful visual aid, mapping TCP states to the XNIO<br>
API: <a href="https://www.lucidchart.com/publicSegments/view/524ec20a-5c40-4fd0-8bde-0a1c0a0046e1/image.png" rel="noreferrer noreferrer noreferrer noreferrer noreferrer" target="_blank">https://www.lucidchart.com/publicSegments/view/524ec20a-5c40-4fd0-8bde-0a1c0a0046e1/image.png</a><br>
<br>
-- <br>
- DML<br>
<br>
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<span>Flavia</span> <span>Rainone</span><span style="color:rgb(170,170,170);margin:0px"></span>
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