[tor-bugs] #30214 [Applications/Tor Browser]: TBA - NPE in ChangeOnionAlphaRunnable

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#30214: TBA - NPE in ChangeOnionAlphaRunnable
-------------------------------------------------+-------------------------
 Reporter:  sysrqb                               |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-mobile, tbb-8.5-must,            |  Actual Points:
  TorBrowserTeam201904                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by sysrqb):

 * status:  new => needs_review


Comment:

 I don't have steps for reproducing it, but I think I have a branch that
 prevents it. This is only a guess, though. Branch `30214_00` in my repo.

 I still think this is happening when the user presses the gear button
 after they started bootstrapping. This patch tries preventing the race
 condition where the background thread remains alive after the current
 activity becomes invalid.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30214#comment:3>
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