bin/57727: dhcpcd exits after a few days

[abs%absd.org@localhost]

>Number:         57727
>Category:       bin
>Synopsis:       dhcpcd exits after a few days
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Nov 27 10:35:00 +0000 2023
>Originator:     David Brownlee
>Release:        NetBSD 10.0_RC1
>Organization:
>Environment:
NetBSD iris.absd.org 10.0_RC1 NetBSD 10.0_RC1 (GENERIC) #0: Wed Nov  8 10:37:54 UTC 2023  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
Seen on two systems, after a few days dhcpcd exits

Both are running with a single active interface (one has a single interface the other has two interfaces only one of which is connected).
dhcpcd_flags are not set (so defaulting to "-qM")

Appears to be similar to https://github.com/NetworkConfiguration/dhcpcd/issues/179

Relevant extract from /var/log/messages

Nov 16 19:42:47 angus dhcpcd[11414]: dhcpcd-9.4.1 starting
Nov 16 19:42:47 angus dhcpcd[1580]: DUID 00:01:00:01:1e:8d:3d:1c:00:24:8c:bc:0c:d5
Nov 16 19:42:47 angus dhcpcd[1580]: bge0: IAID 45:fc:9c:f4
Nov 16 19:42:47 angus dhcpcd[1580]: bge1: waiting for carrier
Nov 16 19:42:47 angus dhcpcd[1580]: bge0: soliciting an IPv6 router
Nov 16 19:42:47 angus dhcpcd[1580]: bge0: soliciting a DHCP lease
Nov 16 19:42:51 angus dhcpcd[1580]: bge0: offered 192.168.1.71 from 192.168.1.1
Nov 16 19:42:57 angus dhcpcd[1580]: bge0: leased 192.168.1.71 for 43200 seconds
Nov 16 19:42:57 angus dhcpcd[1580]: bge0: adding route to 192.168.1.0/24
Nov 16 19:42:57 angus dhcpcd[1580]: bge0: adding default route via 192.168.1.1
Nov 16 19:42:59 angus dhcpcd[1580]: bge0: no IPv6 Routers available
Nov 20 18:05:16 angus dhcpcd[1580]: ps_inet_dodispatch: Connection reset by peer
Nov 20 18:05:16 angus dhcpcd[1580]: control_free: No such file or directory
Nov 20 18:05:16 angus dhcpcd[1580]: ps_sendpsmmsg: Destination address required
Nov 20 18:05:16 angus dhcpcd[1580]: ps_dostop: Destination address required
>How-To-Repeat:
Run dhcpcd, leave system
>Fix:
Current workaround is a cron job to restart dhcpcd nightly