[Kea-users] Dhcp4 crash when using 3.0

[Victoria Risk]

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 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"
>       },
>       {
>         "library": "/usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_flex_option.so",
>         "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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