[tor-bugs] #15421 [Core Tor/Tor]: Relay crash when reloading and resolv.conf is empty

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#15421: Relay crash when reloading and resolv.conf is empty
----------------------------------------+----------------------------------
 Reporter:  TvdW                        |          Owner:
     Type:  defect                      |         Status:  new
 Priority:  High                        |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor                |        Version:  Tor:
                                        |  0.2.7.1-alpha
 Severity:  Normal                      |     Resolution:
 Keywords:  tor-relay resolv.conf  dns  |  Actual Points:
Parent ID:  #21900                      |         Points:  small
 Reviewer:                              |        Sponsor:
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Comment (by atagar):

 Hi there, yesterday I ran into an issue that looks like this too. Here's
 the repro steps I provided from #23036 with the latest git tip (tor commit
 bb66a48).

 **Repro steps:**

 * Start system without a network connection.

 * Start tor, torrc I used was...

 {{{
 % cat ~/.tor/torrc
 ControlPort 9051
 ExitPolicy reject *:*
 }}}

 * Set the ORPort with "SETCONF ORPort=9090".

 **Result:**

 Tor process terminates with...

 {{{
 Jul 25 19:21:33.000 [warn] ControlPort is open, but no authentication
 method has been configured.  This means that any program on your computer
 can reconfigure your Tor.  That's bad!  You should upgrade your Tor
 controller as soon as possible.
 Jul 25 19:21:33.000 [notice] Opening OR listener on 0.0.0.0:9090
 Jul 25 19:21:33.000 [notice] You are running a new relay. Thanks for
 helping the Tor network! If you wish to know what will happen in the
 upcoming weeks regarding its usage, have a look at
 https://blog.torproject.org/blog/lifecycle-of-a-new-relay
 Jul 25 19:21:33.000 [notice] It looks like I need to generate and sign a
 new medium-term signing key, because I don't have one. To do that, I need
 to load (or create) the permanent master identity key. If the master
 identity key was not moved or encrypted with a passphrase, this will be
 done automatically and no further action is required. Otherwise, provide
 the necessary data using 'tor --keygen' to do it manually.
 Jul 25 19:21:33.000 [notice] Your Tor server's identity key fingerprint is
 'Unnamed 4853AB6F9215A837EA3562CF4AF00713737FDF01'
 Jul 25 19:21:33.000 [warn] Unable to parse '/etc/resolv.conf', or no
 nameservers in '/etc/resolv.conf' (6)
 Jul 25 19:21:33.000 [err] set_options(): Bug: Acting on config options
 left us in a broken state. Dying. (on Tor 0.3.2.0-alpha-dev
 bb66a48541aa5110)
 }}}

 Cheers! -Damian

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15421#comment:9>
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