bin/59046: dhcpd issue

[6bone%6bone.informatik.uni-leipzig.de@localhost]

>Number:         59046
>Category:       bin
>Synopsis:       dhcpd issue
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 04 08:15:00 +0000 2025
>Originator:     Uwe
>Release:        10.1_STABLE NetBSD
>Organization:
University of Leipzig
>Environment:
NetBSD 6bone.informatik.uni-leipzig.de 10.1_STABLE NetBSD 10.1_STABLE (MYCONF10) #3: Sat Feb  1 23:06:25 CET 2025  root%6bone.informatik.uni-leipzig.de@localhost:/usr/obj/sys/arch/amd64/compile/MYCONF10 amd64
>Description:
I use netbsd's dhcpd (not pkgsrc) to assign IPv6 addresses. After starting and during runtime, I receive the following messages in the syslog:

dhcpd[23611]: /usr/src/external/mpl/dhcp/bin/server/../../dist/server/mdb6.c(2045): NULL pointer
dhcpd[23611]: /usr/src/external/mpl/dhcp/bin/server/../../dist/server/mdb6.c(2074): negative refcnt

The messages appear at irregular intervals. After a few hours of runtime, dhcpd crashes with a core dump. But no core file is written.

The problem also occurred on Netbsd-10.

Any ideas what the cause could be?
>How-To-Repeat:
I can't say if the problem is reproducible on another system.
>Fix: