[tor-bugs] #15715 [Tor]: spurious "Network is unreachable" error after setting DisableNetwork=1

[Tor Bug Tracker & Wiki]

#15715: spurious "Network is unreachable" error after setting DisableNetwork=1
-----------------------+------------------------------
 Reporter:  mcs        |          Owner:
     Type:  defect     |         Status:  new
 Priority:  normal     |      Milestone:
Component:  Tor        |        Version:  Tor: 0.2.6.6
 Keywords:  tbb-wants  |  Actual Points:
Parent ID:             |         Points:
-----------------------+------------------------------
 If DisableNetwork is set to 1 via SETCONF during bootstrapping, Tor
 sometimes generates spurious errors such as "Network is unreachable".
 Kathy and I saw this while testing a fix for #11879. We realize this may
 be difficult to fix due to the internal architecture / concurrency inside
 Tor.

 See #15713 for steps to reproduce (but note that an error does not occur
 every time).  In the log that is attached to #15713 you can see an
 example:
   Apr 17 10:28:10.000 [warn] Problem bootstrapping. Stuck at 25%: Loading
 networkstatus consensus. (Network is unreachable; NOROUTE; count 1;
 recommendation warn; host 847B1F850344D7876491A54892F904934E4EB85D at
 86.59.21.38:443)
 (the error happens right away if it happens at all – no delay).

 This problem may cause some Tor Browser users to be a little confused; all
 they need to do is click "Open Settings" while Tor Browser was starting up
 and they will sometimes see an error alert.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15715>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online