[Kea-users] Dhcp4 crash when using 3.0
Victoria Risk
vicky at isc.org
Fri Aug 8 17:28:13 UTC 2025
Hi Bret,
I have gone ahead and created the issue on your behalf. You should get an email back from Gitlab and using that, you should be able to update the issue if you have any more information. You should also receive any comments we put on the ticket as we investigate.
Thank you, and have a good weekend!
Vicky
> On Aug 7, 2025, at 5:57 PM, Giddings, Bret <bret at essex.ac.uk> wrote:
>
> Hi again Victoria,
> I rebuilt the server and did a clean install of just kea 3.0. I can still get the issue with my configuration.
> I have also now registered at gitlab.isc.org but please forgive my ignorance as I can’t see how to create a new issue - I don’t proactively use gitlab much. If you can please advise, I’ll get that started.
>
> Regards,
>
> Bret
>
> From: Victoria Risk <vicky at isc.org>
> Date: Thursday, 7 August 2025 at 19:00
> To: Kea user's list <kea-users at lists.isc.org>
> Cc: Giddings, Bret <bret at essex.ac.uk>
> Subject: Re: [Kea-users] Dhcp4 crash when using 3.0
>
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>
> Hi Bret,
>
> This could be the same as another issue we are currently investigating. Can you open an issue in our public Gitlab for Kea?
>
> Go to our development repo at https://gitlab.isc.org/isc-projects/kea <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fgitlab.isc.org%2fisc-projects%2fkea&c=E,1,M5eZ0_ltE-I8bDs8yYR3e_fAyvPMskyj9PZTT4z63-WFpWCG1jA9e_NBif9gMPsraCzo_bqg-9iRIgS9PKLMFTmCnMNmDVQA-eyW_XaexSy9zqdutA,,&typo=1> and click on issues, and create a new issue. Please mark it as confidential, since it is a crash. Then you will receive updates to the ticket as we investigate.
>
> Thank you!
>
> Vicky Risk
>
> On Aug 7, 2025, at 12:11 PM, Giddings, Bret via Kea-users <kea-users at lists.isc.org> wrote:
>
> Hi,
>
> I’m trying to move our environment from 2.6 to 3.0 so have setup one subnet to be served by the new version. This appears to work w.r.t. issuing leases for the subnet in question. However, it also crashes (seemingly randomly) with
>
> kea-dhcp4: /usr/include/boost/smart_ptr/shared_ptr.hpp:728: typename boost::detail::sp_member_access<T>::type boost::shared_ptr<T>::operator->() const [with T = const isc::dhcp::Subnet4; typename boost::detail::sp_member_access<T>::type = const isc::dhcp::Subnet4*]: Assertion `px != 0' failed.
>
> The environment is
>
> Debian 12.11
> Using Cloudsmith images:
> # dpkg -l | grep kea
> ii isc-kea-common 3.0.0-isc20250717111736 amd64 Common libraries for the ISC Kea DHCP server
> ii isc-kea-dhcp-ddns 3.0.0-isc20250717111736 amd64 ISC Kea DHCP Dynamic DNS service
> ii isc-kea-dhcp4 3.0.0-isc20250717111736 amd64 ISC Kea IPv4 DHCP server
> ii isc-kea-hooks 3.0.0-isc20250717111736 amd64 Hook libraries for ISC Kea DHCP server
>
> Is this a known issue and if not, what additional information is required to debug it.
>
> Relevant Kea config which is pretty much identical to 2.6 config with exception of control-sockets is
>
> {
> "Dhcp4": {
> "interfaces-config": {
> "interfaces": [
> "eth0"
> ],
> "dhcp-socket-type": "udp",
> "service-sockets-require-all": true,
> "service-sockets-max-retries": 100,
> "service-sockets-retry-wait-time": 5000
> },
> "control-sockets": [
> {
> "socket-type": "http",
> "socket-port": 8000
> }
> ],
> "multi-threading": {
> "enable-multi-threading": true,
> "thread-pool-size": 2,
> "packet-queue-size": 64
> },
> "lease-database": {
> "type": "memfile",
> "lfc-interval": 1500
> },
> "valid-lifetime": 43200,
> "expired-leases-processing": {
> "reclaim-timer-wait-time": 3600,
> "hold-reclaimed-time": 172800,
> "max-reclaim-leases": 0,
> "max-reclaim-time": 0
> },
> "hooks-libraries": [
> {
> "library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_lease_cmds.so <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2flibdhcp_lease_cmds.so&c=E,1,DMA10UQnTXbL6Fs-sClfMzEQny9ui2guEiwqqiok9m6t_q9wYmJpHVFyk2x9bOeN0UI-hutjsTGLUxvKwoiOQY5wQOEpubmqEuVGiZO2&typo=1&ancr_add=1>"
> },
> {
> "library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_flex_option.so <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2flibdhcp_flex_option.so&c=E,1,gWoQ6RFKxy-zgmLw2EVJih45T5PafjpFSZdXiEwmglENkKLE30z39PCYdxjdElmrEG0lVJysNazv1Z69bDBSApJniBHx-B5WHm8WMC64Xn6W&typo=1&ancr_add=1>",
> "parameters": {
> "options": [
> {
> "code": 61,
> "remove": "member('dhcp-3') or pkt4.giaddr == 10.246.127.253"
> }
> ]
> }
> }
> ],
> "dhcp-ddns": {
> // Connectivity parameters
> "enable-updates": true,
> "server-ip": "127.0.0.1",
> "server-port": 53001,
> "sender-ip": "",
> "sender-port": 0,
> "max-queue-size": 1024,
> "ncr-protocol": "UDP",
> "ncr-format": "JSON"
> },
> // Behavioral parameters (global)
> "ddns-send-updates": true,
> "ddns-override-no-update": false,
> "ddns-override-client-update": true,
> "ddns-replace-client-name": "always",
> "ddns-generated-prefix": "host",
> "ddns-qualifying-suffix": “example.com",
> "ddns-update-on-renew": true,
> "hostname-char-set": "",
> "hostname-char-replacement": "",
> "reservations-global": true,
> "reservations-in-subnet": true,
> "authoritative": true,
> "ip-reservations-unique": false,
> "match-client-id": false,
>
> "client-classes": [
> {"name": "dhcp-2”},
> {"name": "dhcp-42"}
> ],
> "reservations": [
> { "hostname": "foobar", "hw-address": "00:0a:9f:22:c7:b0", "client-classes": ["dhcp-2"] },
> // 20000+ additional reservations of various client-class types not shown
> ],
> "subnet4": [
> {
> "id": 503,
> "subnet": "10.245.34.128/26",
> "option-data": [
> { "name": "routers" , "data": "10.245.34.190" },
> { "name": "domain-name-servers" , "data": "10.245.94.204,10.245.48.89,10.245.252.201" },
> { "name": "domain-name" , "data": "example.com" },
> { "name": "netbios-name-servers", "data": "10.245.42.23,10.245.48.35" }
> ],
> "valid-lifetime": 28800,
> "pools": [{"pool-id": 10503042, "client-class": "dhcp-42", "pool": "10.245.34.129 - 10.245.34.185"}],
> ]
> }
> ] }
> }
> --
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