Unbound crashes periodically with signal 11

mxw39 · Feb 19, 2021, 2:53 AM

@jimp thanks for the support! Is there some debug command that helps collect logs? dumps syscalls before segfault? I hope to contribute my crashing unbound somehow.

jkv · Feb 19, 2021, 1:50 PM

After upgrading two systems (one to CE 2.5.0 and the other, running negate hardware (SG-5100) , to + 21.02) I have also started seeing this issue.

Just in case it helps in spotting any common patterns - I note that:

On both systems (between every 5 to 10 minutes) I see unbound stopping and restarting in the DNS Resolver log.
Only on SG-5100 (pfsense + 21.02) I am also seeing (probably 8 times a day or so) in the General System log that unbound exited on signal 11 (for example "pid 73090 (unbound), jid 0, uid 59: exited on signal 11").
The only packages installed in common on both systems are Cron (0.3.7_5), openvpn-client-export (1.5_5) and Service_Watchdog (1.8.7_1).
The SG-5100 (pfsense + 21.02) also has installed arpwatch (0.2.0_4), freeradius3 (0.15.7_29), and pfBlockerNG-devel (3.0.0_10).
Both systems have WAN connections with dynamic IPs (so ddns is in use on the WAN side).
Both systems also have some Static DHCP entries set (with "Register DHCP static mappings in the DNS Resolver" enabled).

Gertjan · Feb 19, 2021, 2:17 PM

@jkv said in pfSense 2.50 snapshots have been dying for the past couple of days:

I see unbound stopping

&

@jkv said in pfSense 2.50 snapshots have been dying for the past couple of days:

General System log that unbound exited on signal 11

You see it dying.
You use Service_Watchdog to restart it - right ?

@jkv said in pfSense 2.50 snapshots have been dying for the past couple of days:

pfBlockerNG-devel (3.0.0_10).

How often is the pfBlockerNG-devel doing it's cron task ? This task is logged. Does it restart unbound ?
What happens when you stop "Service_Watchdog ", so it doesn't restart unbound ?

What I'm trying to find out : if Service_Watchdog detects that unbound stops, it launches another instance. But it was actually just stopping and restarting, ordered by pfBlockerNG-devel. So, two instances are started, one dies .....
This is just a theory, as I'm not using Service_Watchdog myself

Also, SG-5100 is an Intel based machine, so "You and I" are using the same executable / same binary. Only our "config" differs. I don't know nothing about ARM based binaries, but I tend to say the "Intel" ones are pretty solid.

These :

@jkv said in pfSense 2.50 snapshots have been dying for the past couple of days:

have some Static DHCP entries

do nothing to unbound. The "static DHCP settings" (host name IP relation) are copied in the /etc/hosts file during boot. this file is (also) read by unbound during it's initial start up. These 'static DHCP setting' rarely change, that is, only if you delete/modify/add one. Look at this file, you'll see what I mean.
(In the past) the "DHCP Registration / Register DHCP leases in the DNS Resolver" could be problematic. The ""static DHCP settings"" were never a source of issue.

jkv · Feb 19, 2021, 2:35 PM

@gertjan

the cron job for pfBlockerNG-devel is hourly and there does not appear to be any correlation between this cron job and unbound exiting. I will do some testing with Service_Watchdog disabled to see what happens to unbound.

Salander27 0 · Feb 19, 2021, 4:59 PM

I doubt that service watchdog is the cause of the issue. It wasn't even present on my installation until I installed it so I wouldn't have to manually restart unbound after the crashes.

Salander27 0 · Feb 19, 2021, 5:03 PM

If there was a way for me to get a testing version of pfSense with Unbound 1.13.1 I would be more than happy to install that promptly and give feedback as to whether or not it is helpful at dealing with the issue.

Also, can we get the title of this forum post updated to something like "DNS Resolver/Unbound crashing on pfSense 2.5" so that we can attract the attention of anyone else searching for this issue?

jimp · Feb 19, 2021, 5:05 PM

@salander27-0 said in pfSense 2.50 snapshots have been dying for the past couple of days:

If there was a way for me to get a testing version of pfSense with Unbound 1.13.1 I would be more than happy to install that promptly and give feedback as to whether or not it is helpful at dealing with the issue.

We brought it in for snapshots (2.6.0 in the branch choices) but a new one hasn't built yet which includes it. In theory the branches are close enough at the moment you may be able to manually install the pkg archive file from the snapshot repo without much harm.

jimp · Feb 19, 2021, 5:34 PM

I edited the title of the thread to more accurately describe the issue.

It would also be helpful to know the hardware in the cases where this is happening (e.g. SG-3100, SG-5100, whitebox/custom hardware running CE, etc)

Salander27 0 · Feb 19, 2021, 6:51 PM

@jimp What is the repo URL for the snapshot repo that I can find that updated package in? I checked pkg+https://packages-beta.netgate.com/packages/pfSense_master_amd64-core and pkg+https://packages-beta.netgate.com/packages/pfSense_master_amd64-pfSense_devel and both still had unbound-1.13.0_2.

fivetoedslothbear · Feb 19, 2021, 7:34 PM

@jimp In my case, it's a custom Mini-ITX box I made with a Gigabyte B-150N motherboard (dual gigabit Intel NIC), and this is what the dashboard says about it:

CPU Type 	Intel(R) Celeron(R) CPU G3900 @ 2.80GHz
2 CPUs: 1 package(s) x 2 core(s)
AES-NI CPU Crypto: Yes (active)
Hardware crypto 	AES-CBC,AES-CCM,AES-GCM,AES-ICM,AES-XTS
Kernel PTI 	Enabled

It's been running pfSense successfully for more years than I remember.

I'm getting occasional unbound crashes, and turned on the watchdog to restart the service when it dies.

ETA: I'm running the Community Edition.

jimp · Feb 19, 2021, 8:06 PM

@salander27-0 said in Unbound crashes periodically with signal 11:

@jimp What is the repo URL for the snapshot repo that I can find that updated package in? I checked pkg+https://packages-beta.netgate.com/packages/pfSense_master_amd64-core and pkg+https://packages-beta.netgate.com/packages/pfSense_master_amd64-pfSense_devel and both still had unbound-1.13.0_2.

In my previous reply I said "but a new one hasn't built yet which includes it." -- check later tonight/tomorrow AM.

e1219 · Feb 19, 2021, 8:11 PM

@jimp I am running pfSense CE inside a Proxmox (6.2-10) VM on a Qotom-Q555G6-S05 (i5 7200u).

login-to-view

I only installed the service watchdog package after this issue started occurring as suggested earlier on this thread. In the meantime, I have reverted to a backup of my VM pre-update running pfSense 2.4.5-1.

Salander27 0 · Feb 19, 2021, 9:02 PM

@jimp Sorry, I misunderstood what you saying. I'll check on a built package later.

Also, looks like people are posting on Reddit too.

hans109h · Feb 20, 2021, 1:07 AM

This was happening to me as well. I unchecked "DHCP registration" in the DNS Resolver config and for now it has eliminated the crash.

There was an issue before with this setting triggering an "unable to HUP" type error report, but I don't recall it causing a crash.

Fry-kun · Feb 20, 2021, 1:07 AM

I got tired of seeing delayed DNS queries (because watchdog doesn't restart the service immediately), so I'm currently running a bash loop:
while true; do /usr/local/sbin/unbound -vd -c /var/unbound/unbound.conf; done

-v makes Unbound print a message while starting, so I have a record of all restarts for the last 3 hours, here are the number of seconds between those (in case it helps):

249
213
1982
266
143
45
970
647
1312
4065
174
60

Doesn't seem to be consistent in my case -- but I also have an amount of devices on my network, maybe more devices makes things more noisy..?

Fry-kun · Feb 20, 2021, 1:32 AM

@jimp Do you still want more configuration examples?

Here's mine:
Packages:
Acme, Avahi, RRD Summary, Service_Watchdog, Shellcmd, System_Patches

server:
chroot: /var/unbound
username: "unbound"
directory: "/var/unbound"
pidfile: "/var/run/unbound.pid"
use-syslog: yes
port: 53
verbosity: 1
hide-identity: yes
hide-version: yes
harden-glue: yes
do-ip4: yes
do-ip6: no
do-udp: yes
do-tcp: yes
do-daemonize: yes
module-config: "validator iterator"
unwanted-reply-threshold: 0
num-queries-per-thread: 512
jostle-timeout: 200
infra-host-ttl: 900
infra-cache-numhosts: 10000
outgoing-num-tcp: 10
incoming-num-tcp: 10
edns-buffer-size: 4096
cache-max-ttl: 86400
cache-min-ttl: 0
harden-dnssec-stripped: yes
msg-cache-size: 4m
rrset-cache-size: 8m
num-threads: 4
msg-cache-slabs: 4
rrset-cache-slabs: 4
infra-cache-slabs: 4
key-cache-slabs: 4
outgoing-range: 4096
auto-trust-anchor-file: /var/unbound/root.key
prefetch: no
prefetch-key: no
use-caps-for-id: no
serve-expired: no
aggressive-nsec: no
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: yes
tls-cert-bundle: "/etc/ssl/cert.pem"
tls-port: 853
tls-service-pem: "/var/unbound/sslcert.crt"
tls-service-key: "/var/unbound/sslcert.key"
interface: 192.168.2.1
interface: 192.168.2.1@853
interface: 192.168.6.1
interface: 192.168.6.1@853
interface: 192.168.4.1
interface: 192.168.4.1@853
interface: 192.168.8.1
interface: 192.168.8.1@853
interface: fe80::201:2eff:fe78:9c5f%re1
interface: fe80::201:2eff:fe78:9c5f%re1@853
interface: fe80::201:2eff:fe78:9c5f%re1.6
interface: fe80::201:2eff:fe78:9c5f%re1.6@853
interface: fe80::201:2eff:fe78:9c5f%re1.4
interface: fe80::201:2eff:fe78:9c5f%re1.4@853
interface: fe80::201:2eff:fe78:9c5f%re1.8
interface: fe80::201:2eff:fe78:9c5f%re1.8@853
interface: 127.0.0.1
interface: 127.0.0.1@853
interface: ::1
interface: ::1@853
outgoing-interface: <*** REDACTED ***>
outgoing-interface: <*** REDACTED ***>
private-address: 127.0.0.0/8
private-address: 10.0.0.0/8
private-address: ::ffff:a00:0/104
private-address: 172.16.0.0/12
private-address: ::ffff:ac10:0/108
private-address: 169.254.0.0/16
private-address: ::ffff:a9fe:0/112
private-address: 192.168.0.0/16
private-address: ::ffff:c0a8:0/112
private-address: fd00::/8
private-address: fe80::/10
include: /var/unbound/access_lists.conf
include: /var/unbound/host_entries.conf
include: /var/unbound/dhcpleases_entries.conf
include: /var/unbound/domainoverrides.conf
forward-zone:
	name: "."
	forward-addr: 8.8.8.8
	forward-addr: 8.8.4.4
server:
 log-servfail: yes
 private-domain: "pfsense.mydomain.com"
include: /var/unbound/remotecontrol.conf

both "Register DHCP leases in the DNS Resolver" and "Register DHCP static mappings in the DNS Resolver" are enabled

Lease time is default (24hrs, I think?)

jkv · Feb 20, 2021, 6:00 AM

@hans109h

I also had the “ Register DHCP leases in the DNS Resolver” option enabled when seeing this issue and disabling this option appears to have stopped the crash.

maverick_slo · Feb 20, 2021, 6:02 AM

@jkv +1
No packages at all...

Salander27 0 · Feb 20, 2021, 7:20 AM

@fry-kun I suspect you're seeing crashes approximately whenever certain devices renew their DHCP lease. Since the timing of this has more to do with when that device was turned on you would expect to see somewhat random delays between such renewals.

Question for those experiencing these crashes, do you have both "Register DHCP static mappings in the DNS Resolver" enabled AND DHCP Static Mappings where at least one mapping has something filled in in the hostname field?

Fry-kun · Feb 20, 2021, 7:27 AM

@salander27-0 said in Unbound crashes periodically with signal 11:

Question for those experiencing these crashes, do you have both "Register DHCP static mappings in the DNS Resolver" enabled AND DHCP Static Mappings where at least one mapping has something filled in in the hostname field?

Affirmative