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Thank you Daniel.</div>
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The part that was suspicious to me is</div>
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```</div>
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int timeoutLeft = pktTimeout;<br>
do {<br>
...</div>
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timeoutLeft = pktTimeout - ((int) (end - start));</div>
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} while (timeoutLeft > MIN_TIMEOUT);</div>
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```</div>
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<br>
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Here, timeoutLeft is not iteratively decreased, but is always derived from `pktTimeout`.</div>
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I can see a case where `timeoutLeft` never drops below `MIN_TIMEOUT` (this is the part where I'm not sure if I'm missing some deeper knowledge).</div>
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<br>
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Kind regards,</div>
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-- Marko</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Daniel Fuchs <daniel.fuchs@oracle.com><br>
<b>Sent:</b> Wednesday, September 4, 2024 15:27<br>
<b>To:</b> Marko Bakšić <Marko.Baksic@infobip.com><br>
<b>Subject:</b> [EXTERNAL] Re: Possible bug in jdk.naming.dns. I need guidance on how get someone smarter to look at it.</font>
<div> </div>
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<div class="PlainText">Hi Marko,<br>
<br>
This is not the proper list for this kind of question:<br>
I'm moving the discussion to core-libs-dev at openjdk.org.<br>
<br>
There's definitely a bug here: that code should use<br>
System.nanoTime() and not System.currentTimeMillis()<br>
since the latter is not guaranteed to be monotonic.<br>
<br>
It may not explain the issue you are observing, but<br>
again, it may cause the timeout to punctually increase.<br>
<br>
I have logged<br>
<a href="https://bugs.openjdk.org/browse/JDK-8339538">https://bugs.openjdk.org/browse/JDK-8339538</a><br>
<br>
I wonder if that has an impact on what you are observing.<br>
<br>
best regards,<br>
<br>
-- daniel<br>
<br>
On 04/09/2024 13:50, Marko Bakšić wrote:<br>
> Hey there!<br>
> <br>
> Sorry for coming here with a technical question, but I would appreciate <br>
> if you could point me in the right direction.<br>
> <br>
> We experienced a bug in production a few times already and through <br>
> profiling we suspect it is an infinite loop here:<br>
> <a href="https://github.com/openjdk/jdk/blob/master/src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java#L475">
https://github.com/openjdk/jdk/blob/master/src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java#L475</a> <<a href="https://github.com/openjdk/jdk/blob/master/src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java#L475">https://github.com/openjdk/jdk/blob/master/src/jdk.naming.dns/share/classes/com/sun/jndi/dns/DnsClient.java#L475</a>><br>
> <br>
> I came here before opening a bug report, because I'm not sure I am <br>
> right. We haven't been able to reproduce the bug in a dev environment.<br>
> Before spending much more time trying to reproduce this, I was hoping <br>
> someone smarter could give me a hint if this is even the right direction.<br>
> <br>
> If no one here can help, I'd appreciate if you could point me in a <br>
> direction of somewhere where I could have a casual discussion about <br>
> this, or get some more eyes on this.<br>
> <br>
> Thank you very much.<br>
> <br>
> -- Marko<br>
> <br>
> <br>
> <br>
> <br>
> *Marko Bakšić*<br>
> <br>
> Software Engineer<br>
> <br>
> <br>
> <br>
> *E *Marko.Baksic@infobip.com<br>
> <br>
> *M*<br>
> <br>
> <br>
> <br>
> *A *Utinjska 29A, 10000 Zagreb, Croatia<br>
> <br>
> www.infobip.com<<a href="http://www.infobip.com">http://www.infobip.com</a>><br>
> <br>
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