[asterisk-bugs] [JIRA] (ASTERISK-28290) res_resolver_unbound.so: Failed to perform async DNS resolution

[Mark (JIRA)]

Mark created ASTERISK-28290:
-------------------------------

             Summary: res_resolver_unbound.so: Failed to perform async DNS resolution
                 Key: ASTERISK-28290
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-28290
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Resources/res_resolver_unbound
    Affects Versions: 16.1.1
         Environment: OpenBSD 6.4 -current (amd64)
            Reporter: Mark
            Severity: Minor


After upgrading asterisk 13.24.1 -> 16.1.1, i'm occasionally getting the following error which leads to asterisk not being able to register/re-register with my SIP provider.

{quote}ERROR[-1]:res_resolver_unbound.c:306 unbound_resolver_resolve: Failed to perform async DNS resolution of 'tel.t-online.de'{quote}

As soon, as this message appears,  CPU usage is going up to nearly 100%

As i said, there's no real timeframe when it happens.
- multiple times in a row directly after restarting asterisk
- after few minutes, so initial registration works, re-registration fails
- after hours, so initial registration works, re-registration fails

I can fully circumvent this error with asterisk running perfectly stable over days when unloading "res_resolver_unbound.so" via module.conf. I think this leads to asterisk using the system resolver? I've attached the console log and what i wonder about is, that although the res_resolver_unbound module is loaded during that test, i don't seen any resolver_unbound DEBUG messages here...only pjsip_resolver. Is that correct behaviour?



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