[tor-bugs] #20824 [Core Tor/Tor]: [prop271, controller] DROPGUARDS support for new guard backend

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#20824: [prop271, controller] DROPGUARDS support for new guard backend
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.3.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-guard regression                 |  Actual Points:  .1
  TorCoreTeam201612                              |
Parent ID:  #20822                               |         Points:  .5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by nickm):

 * status:  needs_revision => needs_review


Comment:

 You were right about this needing unit tests; I found a use-after-free
 error. :(

 Rebased onto master, tests and fixup commits added, in branch
 `bug20824_v2` .

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20824#comment:12>
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