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    Unbound crashes periodically with signal 11

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    2.5 Development Snapshots (Retired)
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    • E
      e1219
      last edited by

      @jimp

      I updated to the latest stable release 2.5.0 from 2.4.5 last night and have started experiencing this issue as well. I have made no changes to my config since updating.

      I see this error in my log which brought me to this thread.
      Feb 18 09:25:46 kernel pid 62259 (unbound), jid 0, uid 59: exited on signal 11

      Afterwards I see the following error as unbound pid 62259 died.
      Feb 18 09:27:06 dhcpleases 52367 Could not deliver signal HUP to process 62259: No such process.
      Feb 18 09:28:04 dhcpleases 52367 Could not deliver signal HUP to process 62259: No such process.
      Feb 18 09:30:40 dhcpleases 81970 Could not deliver signal HUP to process 62259: No such process.

      Here are some of the config details you mentioned, please let me know if there are any other details that might help.

      Installed packages:
      Avahi 2.1_1
      pfBlockerNG-devel 3.0.0_10
      Service_Watchdog 1.8.7_1

      Contents of /var/unbound/unbound.conf
      unbound.conf

      Enabled:
      Register DHCP leases in the DNS Resolver
      Register DHCP static mappings in the DNS Resolver
      Disabled:
      Register connected OpenVPN clients in the DNS Resolver

      My DHCP server is using the default default-lease-time (7200s) and default maximum lease time (86400s). Looking at my current lease table, my devices are respecting the 2hr lease duration, but register at different times.

      b94b16a4-9200-4eb9-8240-18de0bf94192-image.png

      1 Reply Last reply Reply Quote 0
      • S
        Salander27 0 @jimp
        last edited by

        @jimp

        Installed Packages:
        acme 0.6.9_3
        arping 1.2.2_2
        iperf 3.0.2_5
        nmap 1.4.4_2
        openvpn-client-export 1.5_5
        Service_Watchdog 1.8.7_1
        softflowd 1.2.6_1
        sudo 0.3_6

        /var/unbound/unbound.conf
        [0_1613672909675_unbound.conf](Uploading 100%)

        Enabled:
        Register DHCP leases in the DNS Resolver
        Register DHCP static mappings in the DNS Resolver
        Disabled:
        Register connected OpenVPN clients in the DNS Resolver

        Lease time is currently 6hrs (which is helping as I see there was only one crash in the last 12 hours) up from 15 minutes (which was crashing constantly).

        1 Reply Last reply Reply Quote 0
        • M
          mkernalcon
          last edited by

          After updating just a few hours ago to the 2.5.0 release on our main router, I can confirm that I am having the same issue. I've temporarily fixed it by disabling the "Register DHCP leases in the DNS Resolver" option. I can confirm, looking through the logs, that several HUPs get sent properly, all to the same PID, before finally starting to fail with "No such process". The last HUP that doesn't immediately fail in DHCP logs, has exactly the same timestamp as "pid 55598 (unbound), jid 0, uid 59: exited on signal 11" in the general log. No information in the DNS resolver logs.

          DHCP Leases are default (7200s) for all vlans except my "main" lan, which is 691200s. Looks like the HUPs that kill it come from the 7200s vlans, but this is probably just coincidence.

          Installed Packages:
          darkstat
          iperf
          nmap
          nut
          openvpn-client-export
          Status_Traffic_Totals

          unbound.conf (has not been edited manually):

          ##########################
# Unbound Configuration
##########################

##
# Server configuration
##
server:

chroot: /var/unbound
username: "unbound"
directory: "/var/unbound"
pidfile: "/var/run/unbound.pid"
use-syslog: yes
port: 53
verbosity: 2
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: 12
msg-cache-slabs: 8
rrset-cache-slabs: 8
infra-cache-slabs: 8
key-cache-slabs: 8
outgoing-range: 4096
#so-rcvbuf: 4m
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
# Unbound Statistics
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: yes

# TLS Configuration
tls-cert-bundle: "/etc/ssl/cert.pem"

# Interface IP(s) to bind to
interface: 192.168.2.1
interface: 192.168.3.1
interface: 192.168.4.1
interface: 192.168.11.1
interface: 192.168.99.1
interface: 127.0.0.1
interface: ::1

# Outgoing interfaces to be used

# DNS Rebinding
# For DNS Rebinding prevention
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
# Set private domains in case authoritative name server returns a Private IP address



# Access lists
include: /var/unbound/access_lists.conf

# Static host entries
include: /var/unbound/host_entries.conf

# dhcp lease entries
include: /var/unbound/dhcpleases_entries.conf



# Domain overrides
include: /var/unbound/domainoverrides.conf




###
# Remote Control Config
###
include: /var/unbound/remotecontrol.conf
          1 Reply Last reply Reply Quote 0
          • jimpJ
            jimp Rebel Alliance Developer Netgate
            last edited by

            OK so nothing jumps out in those configs. I still can't make it crash here even hammering on it.

            I see that Unbound 1.13.1 is out now, we might need to pull that in and test against it. I reopened https://redmine.pfsense.org/issues/11316 which was initially closed since we didn't have enough information.

            Keep the details coming here on this forum post, we may still be able to spot a pattern.

            Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

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            M 1 Reply Last reply Reply Quote 0
            • M
              mxw39 @jimp
              last edited by mxw39

              @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.

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              • J
                jkv
                last edited by jkv

                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).
                GertjanG 1 Reply Last reply Reply Quote 0
                • GertjanG
                  Gertjan @jkv
                  last edited by

                  @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.

                  No "help me" PM's please. Use the forum, the community will thank you.
                  Edit : and where are the logs ??

                  J 1 Reply Last reply Reply Quote 0
                  • J
                    jkv @Gertjan
                    last edited by

                    @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.

                    S 1 Reply Last reply Reply Quote 1
                    • S
                      Salander27 0
                      last edited by

                      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.

                      1 Reply Last reply Reply Quote 0
                      • S
                        Salander27 0
                        last edited by

                        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?

                        jimpJ 1 Reply Last reply Reply Quote 0
                        • jimpJ
                          jimp Rebel Alliance Developer Netgate @Salander27 0
                          last edited by

                          @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.

                          Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                          Need help fast? Netgate Global Support!

                          Do not Chat/PM for help!

                          1 Reply Last reply Reply Quote 0
                          • jimpJ
                            jimp Rebel Alliance Developer Netgate
                            last edited by

                            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)

                            Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                            Need help fast? Netgate Global Support!

                            Do not Chat/PM for help!

                            F E 2 Replies Last reply Reply Quote 0
                            • S
                              Salander27 0
                              last edited by

                              @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.

                              jimpJ 1 Reply Last reply Reply Quote 1
                              • F
                                fivetoedslothbear @jimp
                                last edited by fivetoedslothbear

                                @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.

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                                • jimpJ
                                  jimp Rebel Alliance Developer Netgate @Salander27 0
                                  last edited by

                                  @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.

                                  Remember: Upvote with the 👍 button for any user/post you find to be helpful, informative, or deserving of recognition!

                                  Need help fast? Netgate Global Support!

                                  Do not Chat/PM for help!

                                  S 1 Reply Last reply Reply Quote 1
                                  • E
                                    e1219 @jimp
                                    last edited by

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

                                    78a0f8de-ff9b-402e-b660-ec0b940d7d68-image.png

                                    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.

                                    1 Reply Last reply Reply Quote 1
                                    • S
                                      Salander27 0
                                      last edited by

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

                                      Also, looks like people are posting on Reddit too.

                                      1 Reply Last reply Reply Quote 0
                                      • H
                                        hans109h
                                        last edited by

                                        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.

                                        F J 2 Replies Last reply Reply Quote 0
                                        • F
                                          Fry-kun @hans109h
                                          last edited by

                                          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..?

                                          S 1 Reply Last reply Reply Quote 0
                                          • F
                                            Fry-kun @jimp
                                            last edited by Fry-kun

                                            @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?)

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