[tor-bugs] #21900 [Core Tor/Tor]: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is empty

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#21900: evdns fails when resolv.conf is missing, but succeeds when resolv.conf is
empty
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  technical-debt, dns, crash, tor-     |  Actual Points:
  relay, macos                                   |
Parent ID:                                       |         Points:  2
 Reviewer:                                       |        Sponsor:
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Comment (by teor):

 Replying to [comment:1 teor]:
 > Also, if you issue a SETCONF to tor while it's in this state, it will
 abort with:
 >
 >     [err] set_options: Bug: Acting on config options left us in a broken
 state. Dying. (on Tor 0.2.9.9 008f2846b9b53d52)
 >
 > This is not such an important crash, because it only happens on
 platforms which remove resolv.conf (which as far as I know, is only macOS
 when the network is down). And I think it only happens on relays, not
 clients. But it would still be nice to fix it.

 Tor Browser could trigger this crash by issuing a SETCONF when the network
 is down, but it doesn't use local DNS in the default config, so I think
 that's ok.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21900#comment:3>
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