bin/56515: dhcpd dumps core after running a while (SIGSEGV)

To: gnats-admin%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost
Subject: bin/56515: dhcpd dumps core after running a while (SIGSEGV)
From: greywolf%starwolf.com@localhost
Date: Sat, 20 Nov 2021 20:10:00 +0000 (UTC)

>Number:         56515
>Category:       bin
>Synopsis:       dhcpd dumps core after running a while (SIGSEGV)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 20 20:10:00 +0000 2021
>Originator:     Greywolf
>Release:        NetBSD 9.99.92
>Organization:
>Environment:
System: NetBSD deep-thought.sub-etha.starwolf.com 9.99.92 NetBSD 9.99.92 (DEEP-THOUGHT) #0: Wed Nov 17 17:39:14 PST 2021 greywolf%eddie.starwolf.com@localhost:/sys/arch/amd64/compile/DEEP-THOUGHT amd64
Architecture: x86_64
Machine: amd64
/usr/sbin/dhcpd:
	-lirs.18 => /usr/lib/libirs.so.18
	-lblocklist.0 => /usr/lib/libblocklist.so.0
	-lc.12 => /usr/lib/libc.so.12
	-lpthread.1 => /usr/lib/libpthread.so.1
	-lgssapi.11 => /usr/lib/libgssapi.so.11
	-lkrb5.27 => /usr/lib/libkrb5.so.27
	-lhx509.6 => /usr/lib/libhx509.so.6
	-lasn1.10 => /usr/lib/libasn1.so.10
	-lcom_err.8 => /usr/lib/libcom_err.so.8
	-lroken.20 => /usr/lib/libroken.so.20
	-lutil.7 => /usr/lib/libutil.so.7
	-lcrypt.1 => /usr/lib/libcrypt.so.1
	-lcrypto.14 => /usr/lib/libcrypto.so.14
	-lwind.1 => /usr/lib/libwind.so.1
	-lheimbase.2 => /usr/lib/libheimbase.so.2
	-lsqlite3.1 => /usr/lib/libsqlite3.so.1
	-lm.0 => /usr/lib/libm.so.0
	-lheimntlm.5 => /usr/lib/libheimntlm.so.5
	-lisccfg.18 => /usr/lib/libisccfg.so.18
	-lisc.18 => /usr/lib/libisc.so.18
	-lz.1 => /usr/lib/libz.so.1
	-ldns.18 => /usr/lib/libdns.so.18
	-lexecinfo.0 => /usr/lib/libexecinfo.so.0
	-lelf.2 => /usr/lib/libelf.so.2
	-lkvm.6 => /usr/lib/libkvm.so.6
	-lssl.14 => /usr/lib/libssl.so.14
	-lipsec.3 => /usr/lib/libipsec.so.3
/usr/sbin/dhcpd:
     $NetBSD: crt0.S,v 1.4 2018/11/26 17:37:46 joerg Exp $
     $NetBSD: crt0-common.c,v 1.24 2021/04/20 21:42:31 christos Exp $
     $NetBSD: crti.S,v 1.1 2010/08/07 18:01:35 joerg Exp $
     $NetBSD: crtbegin.S,v 1.2 2010/11/30 18:37:59 joerg Exp $
     $NetBSD: dhcpd.c,v 1.4 2021/05/26 22:52:32 christos Exp $
     $NetBSD: dhcp.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: dhcpv6.c,v 1.4 2020/08/03 21:10:57 christos Exp $
     $NetBSD: bootp.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: confpars.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: db.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: class.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: failover.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: omapi.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: mdb.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: mdb6.c,v 1.5 2020/08/03 21:10:57 christos Exp $
     $NetBSD: stables.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: salloc.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: ddns.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: dhcpleasequery.c,v 1.3 2020/08/03 21:10:57 christos Exp $
     $NetBSD: dispatch.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: icmp.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: comapi.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: memory.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: discover.c,v 1.4 2020/08/03 21:10:56 christos Exp $
     $NetBSD: execute.c,v 1.3 2020/08/03 21:10:56 christos Exp $
     $NetBSD: dns.c,v 1.4 2020/08/03 21:10:56 christos Exp $
     $NetBSD: alloc.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: tables.c,v 1.3 2020/08/03 21:10:56 christos Exp $
     $NetBSD: tree.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: options.c,v 1.5 2021/01/13 17:01:31 christos Exp $
     $NetBSD: ctrace.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: socket.c,v 1.4 2020/08/03 21:10:56 christos Exp $
     $NetBSD: bpf.c,v 1.4 2020/05/15 12:31:03 manu Exp $
     $NetBSD: print.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: packet.c,v 1.3 2020/05/15 12:31:03 manu Exp $
     $NetBSD: ethernet.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: conflex.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: parse.c,v 1.4 2021/05/26 22:52:31 christos Exp $
     $NetBSD: ns_name.c,v 1.3 2020/08/03 21:10:56 christos Exp $
     $NetBSD: inet.c,v 1.2 2018/04/07 22:37:29 christos Exp $
     $NetBSD: convert.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: auth.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: handle.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: support.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: hash.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: protocol.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: generic.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: listener.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: connection.c,v 1.3 2019/01/10 17:41:47 christos Exp $
     $NetBSD: isclib.c,v 1.6 2021/08/19 11:50:56 christos Exp $
     $NetBSD: toisc.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: array.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: dispatch.c,v 1.4 2019/01/27 01:51:50 christos Exp $
     $NetBSD: result.c,v 1.3 2019/02/25 02:31:57 christos Exp $
     $NetBSD: buffer.c,v 1.4 2019/01/27 01:51:50 christos Exp $
     $NetBSD: trace.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: alloc.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: errwarn.c,v 1.4 2020/11/12 22:11:03 christos Exp $
     $NetBSD: message.c,v 1.2 2018/04/07 22:37:30 christos Exp $
     $NetBSD: crtend.S,v 1.1 2010/08/07 18:01:34 joerg Exp $
     $NetBSD: crtn.S,v 1.1 2010/08/07 18:01:35 joerg Exp $

dhcpd.conf: (sanitized)
# *** GLOBAL PARAMETERS ***

default-lease-time 600;
max-lease-time 7200;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
authoritative;

# Dynamic DNS update scheme - must be set to "none", "interim" or "ad-hoc".
ddns-update-style interim;
#ddns-update-style none;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility daemon;

zone internal.starwolf.com. {
    primary 172.31.250.11;
}

zone 250.31.172.in-addr.arpa. {
    primary 172.31.250.11;
}

subnet 172.31.250.0 netmask 255.255.254.0 {
    interface wm1;
	range 172.31.251.0 172.31.251.240;
	option domain-name-servers 172.31.250.11, 172.31.250.2, 8.8.8.8;
	option domain-name "internal.starwolf.com.";
	option routers 172.31.250.1;

	option broadcast-address 172.31.251.255;
	default-lease-time 600;
	max-lease-time    7200;
	allow client-updates;

}

host milliways {
	hardware ethernet C0:FF:EE:0D:EC:AF
	fixed-address	172.31.251.242;
	option domain-name-servers 192.168.60.2, 172.31.250.11, 172.31.250.2;
	prepend domain-name "mywork.com ";
	option routers 172.31.250.1;
}

Termination backtrace:
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000764028c46076 in isc_hp_retire () from /usr/lib/libisc.so.18
[Current thread is 1 (process 9295)]

>Description:
	dhcpd runs for a couple hours and then gives up the ghost with
	a SIGSEGV
>How-To-Repeat:
	/usr/bin/dhcpd -q; connect several devices.
>Fix:
	Currently, once a minute, I am running a check-and-restart-if-needed
	script via cron to keep the dhcpd up and going.

Follow-Ups:
- Re: bin/56515: dhcpd dumps core after running a while (SIGSEGV)
  - From: Christos Zoulas

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