[tor-bugs] #31898 [Core Tor/Tor]: Occasional crash during shutdown when using Tor API

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#31898: Occasional crash during shutdown when using Tor API
-------------------------------------------------+-------------------------
 Reporter:  sysrqb                               |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.4.1.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  crash, 042-must 041-backport         |  Actual Points:  .3
  consider-backport-after-0423, 041-regression   |
Parent ID:                                       |         Points:  1
 Reviewer:  teor                                 |        Sponsor:
                                                 |  Sponsor31-must
-------------------------------------------------+-------------------------
Changes (by teor):

 * keywords:  crash, 042-must 041-backport 041-regression =>
     crash, 042-must 041-backport consider-backport-after-0423,
     041-regression
 * status:  needs_review => merge_ready
 * version:  Tor: 0.4.2.1-alpha => Tor: 0.4.1.1-alpha
 * reviewer:   => teor


Comment:

 Looks fine to me.

 The actual fix is small, this PR is mostly tests and test refactoring.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31898#comment:12>
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