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<p class="MsoNormal"><span style="font-size:12.0pt">We’re using packages from EPEL, and upgraded to 2.6.3 maybe a month or so ago. I didn’t notice any issues before with 2.6.2 and there was a bit of a gap on using the config-reload after migrating to 2.6.3
and just now we’re noticing it. <br>
<br>
I’ve also tested on test server with same os, packages, etc., but without any active leases, and there’s no crash when reloading.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Thanks,<br>
Diogo<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Razvan Becheriu <razvan@isc.org><br>
<b>Date: </b>Tuesday, October 14, 2025 at 8:40</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> </span><span style="font-size:12.0pt;color:black">AM<br>
<b>To: </b>Kea user's list <kea-users@lists.isc.org><br>
<b>Cc: </b>Kea user's list <kea-users@lists.isc.org>, Diogo André de Assumpção <daa@meta.com><br>
<b>Subject: </b>Re: [Kea-users] Dhcp6 crash with config-reload command v2.6.3<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi, We need more information. Do you use pkgs or do you compile? Have you been using a different version before upgrading/installing? If using pkgs, are these official
ISC kea packages? Thank you, Razvan From: Diogo <kea-users@</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">lists.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">isc.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">org><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">We need more information.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<p><span style="font-family:"Arial",sans-serif;color:black">Do you use pkgs or do you compile?<o:p></o:p></span></p>
<p><span style="font-family:"Arial",sans-serif;color:black">Have you been using a different version before upgrading/installing?<o:p></o:p></span></p>
<p><span style="font-family:"Arial",sans-serif;color:black">If using pkgs, are these official ISC kea packages?<o:p></o:p></span></p>
<p><span style="font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span style="font-family:"Arial",sans-serif;color:black">Thank you,<o:p></o:p></span></p>
<p><span style="font-family:"Arial",sans-serif;color:black">Razvan<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">From:
</span></strong><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Diogo <kea-users@lists.isc.org><br>
<strong><span style="font-family:"Arial",sans-serif">To: </span></strong>Kea <kea-users@lists.isc.org><br>
<strong><span style="font-family:"Arial",sans-serif">Cc: </span></strong>Diogo <daa@meta.com><br>
<strong><span style="font-family:"Arial",sans-serif">Date: </span></strong>Tuesday, 14 October 2025 4:12 PM EEST<br>
<strong><span style="font-family:"Arial",sans-serif">Subject: </span></strong>Re: [Kea-users] Dhcp6 crash with config-reload command v2.6.3<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Thanks for the link, Darren. My lfc is set to 7200 seconds, and I can consistently repro the issue, so
unlikely to be hitting that condition. That said, after I bumped the logs to debug I could see some better messages, which seems related to memfile-lfc:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">2025-10-14 06:04:41.596 INFO kea-dhcp6.dhcp6 DHCP6_CONFIG_COMPLETE DHCPv6 server has completed configuration:
added IPv6 subnets: 4698; DDNS: disabled<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">2025-10-14 06:04:42.221 DEBUG kea-dhcp6.dhcpsrv DHCPSRV_CLOSE_DB closing currently open memfile database<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">2025-10-14 06:04:42.221 DEBUG kea-dhcp6.dhcpsrv DHCPSRV_TIMERMGR_UNREGISTER_TIMER unregistering timer:
memfile-lfc<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">2025-10-14 06:04:42.221 DEBUG kea-dhcp6.dhcpsrv DHCPSRV_MEMFILE_LFC_UNREGISTER_TIMER_FAILED failed to unregister
timer 'memfile-lfc': unable to unregister non existing timer 'memfile-lfc'<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">For reference, here’s what the lease section of my config looks like:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> "lease-database": {<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> "type": "memfile",<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> "name": "/var/lib/kea/kea-dhcp6.csv",<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> "lfc-interval": 7200,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> "persist": true<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> },<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black">Diogo<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><strong><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></strong><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">
Kea-users <kea-users-bounces@lists.isc.org> on behalf of Darren Ankney <darren.ankney@gmail.com><br>
<strong><span style="font-family:"Calibri",sans-serif">Sent:</span></strong> Tuesday, October 14, 2025 2:01:36 AM<br>
<strong><span style="font-family:"Calibri",sans-serif">To:</span></strong> Kea user's list <kea-users@lists.isc.org><br>
<strong><span style="font-family:"Calibri",sans-serif">Subject:</span></strong> Re: [Kea-users] Dhcp6 crash with config-reload command v2.6.3</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<br>
Hi Diogo,<br>
<br>
That backtrace doesn't look particularly useful because no symbols<br>
were found. Kea's logs would probably be far more useful in this<br>
case. it would have some message indicating why it is exiting. Here<br>
is one example of a problem you could be encountering:<br>
<a href="https://urldefense.com/v3/__https:/gitlab.isc.org/isc-projects/kea/-/issues/3986__;!!Bt8RZUm9aw!5lLpANoHvQQvKiYaNVp_snTIJEP7aIzeFRxARTJkRY0DpyQZ-bOuL5RS6BqpenRvmpHjAJR5IJJDBDxQ$" target="_blank">https://urldefense.com/v3/__https://gitlab.isc.org/isc-projects/kea/-/issues/3986__;!!Bt8RZUm9aw!5lLpANoHvQQvKiYaNVp_snTIJEP7aIzeFRxARTJkRY0DpyQZ-bOuL5RS6BqpenRvmpHjAJR5IJJDBDxQ$</a>
but without log<br>
messages, it is just guessing.<br>
<br>
Thank you,<br>
Darren Ankney<br>
<br>
On Mon, Oct 13, 2025 at 6:15 PM Diogo André de Assumpção via Kea-users<br>
<kea-users@lists.isc.org> wrote:<br>
><br>
> Hi All,<br>
><br>
> I’ve been experiencing an issue with kea-dhcp6 (4 doesn’t seem affected) where when I issue a config-reload command directly to the dhcp6 socket, the server crashes.<br>
><br>
><br>
><br>
> Looking at the backtrace it seems to be related to the lease management – I’m using memfile – and maybe some cleanup that is done as part of the reload?<br>
><br>
><br>
><br>
> Has anyone experienced something similar?<br>
><br>
><br>
><br>
> Note that the config file loads fine when starting the server.<br>
><br>
><br>
><br>
> Here’s a backtrace and a few more things from the coredump if it helps: <a href="https://gist.github.com/DiogoAndre/aa8c144329424b431b755711d7a96606" target="_blank">
https://gist.github.com/DiogoAndre/aa8c144329424b431b755711d7a96606</a> <br>
><br>
><br>
><br>
> Thanks,<br>
> – Diogo<br>
><br>
><br>
><br>
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