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    Unbound DNS Resolver crashing randomly

    Scheduled Pinned Locked Moved General pfSense Questions
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    • C Offline
      cmb
      last edited by

      Can't say I have. Anything in the resolver log?

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      • A Offline
        asterix
        last edited by

        Nothing. That's the problem.

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        • T Offline
          Trel
          last edited by

          When it's in the crashed state, do pages not resolve ("xyz.com cannot be found") or do they load differently, like blank or what not?

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          • A Offline
            asterix
            last edited by

            Yup, browser complains of sites not been resolved due to DNS resolution issue.

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            • K Offline
              kejianshi
              last edited by

              This is 2.2?  Did you update from 2.1.5 with unbound package on that?

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              • H Offline
                heper
                last edited by

                try increasing verbosity of logging to 2 on services: dns resolver: advanced settings

                try attaching it to your next post after a crash (might be good to clear resolver log and then restart it … can be done in  Status: System logs: Resolver )

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                • BBcan177B Offline
                  BBcan177 Moderator
                  last edited by

                  I have also noticed crashes in Unbound with no errors being logged… I have even tried increasing Log Verbosity to 5...

                  Wouldn't an auto-restart function be nice? Or have it revert to a previous conf file, or atleast revert to forwarding mode when it crashes?

                  Maybe the Service Watchguard could be used...

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                  • dennypageD Offline
                    dennypage
                    last edited by

                    For what it's worth, I saw this on rare occasion during RC testing. In my case, the crash was usually shortly after reboot. Since GA, it's been stable for me, but I also haven't been rebooting.

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                    • D Offline
                      doktornotor Banned
                      last edited by

                      @BBcan177:

                      Maybe the Service Watchguard could be used…

                      Yes, this certainly works.

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                      • A Offline
                        asterix
                        last edited by

                        I did install Service Watchdog after the repeated crashing. So far it looks to be fine. But the underlying issue needs to be fixed.

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                        • T Offline
                          Trel
                          last edited by

                          To combat DNS cache poisoning issues, I'm now exclusively using unbound as my resolver, and I just saw this happen this morning.
                          I restarted the service and setup Service watchdog.  I also just set up email notifications as well so if it happens, I'll check logs for that time and maybe one of us will be able to get something useful from logs.

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                          • K Offline
                            kejianshi
                            last edited by

                            Might it be crashing because someone outside the network is hammering it maliciously?  Not sure if thats possibly the case?
                            I'm reading that:

                            A denial of service flaw was found in the way BIND followed DNS delegations. A remote attacker could use a specially crafted zone containing a large number of referrals which, when looked up and processed, would cause named to use excessive amounts of memory or crash.  (yes I know - Thats bind.  Might it be happening with unbound?)

                            FreeBSD Security Advisory - By causing queries to be made against a maliciously-constructed zone or against a malicious DNS server, an attacker who is able to cause specific queries to be sent to a nameserver can trick unbound(8) resolver into following an endless series of delegations, which consumes a lot of resources. (this is unbound)

                            Anyway - Just wondering if this is less of a general stability issue and more of a someone is trying to hack my DNS issue.

                            At any rate, I'd rather my DNS get periodically restarted than to be misdirected.  Wonder if the advanced setting might offer a way to prevent this from happening if this is the case seeing as how Trel is experiencing this and its fairly clear his DNS previously was being screwed with.

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                            • F Offline
                              firewalluser
                              last edited by

                              @heper:

                              try increasing verbosity of logging to 2 on services: dns resolver: advanced settings

                              try attaching it to your next post after a crash (might be good to clear resolver log and then restart it … can be done in  Status: System logs: Resolver )

                              I wonder if this is what I experienced the other day as well, loads of webpages even some in the google cache were becoming unavailable.

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                              • A Offline
                                asterix
                                last edited by

                                Happened again..

                                This webpage is not available

                                The server at www.samsung.com can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Internet from accessing the network.

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                                • K Offline
                                  kejianshi
                                  last edited by

                                  Still - No one knows anything about your settings in dns resolver or system > general….

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                                  • A Offline
                                    asterix
                                    last edited by

                                    Default settings. This is a clean install. Just did a plain vanilla install this morning to rule out any user entered settings killing it.

                                    Definite issue in the resolver. Noticed this happening frequently while using eBay android app. Never saw such issues in 2.1.5

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                                    • K Offline
                                      kejianshi
                                      last edited by

                                      Cool - 64bit?  Pure hardware.  No VM?

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                                      • A Offline
                                        asterix
                                        last edited by

                                        Yup  amd64 on i3

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                                        • A Offline
                                          asterix
                                          last edited by

                                          This issue has started to become a nuisance. Kids have started to complain about it happening every 30 mins. Sometimes twice every 15 mins. Did a clean install again but it's still the same.
                                          No errors logged and service is up the whole time. Only way temporary solution is to do a manual service restart.

                                          Is anyone working on fixing this?

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                                          • D Offline
                                            doktornotor Banned
                                            last edited by

                                            Since noone can reproduce it, pretty much doubt anyone's working on it. Maybe you have some lolcats in there?!  :o

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