[tor-bugs] #31735 [Core Tor/Tor]: Exit and join all threads, before destroying any mutexes in the main thread

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#31735: Exit and join all threads, before destroying any mutexes in the main thread
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core     |    Version:  Tor: 0.3.5.1-alpha
  Tor/Tor                |   Keywords:  consider-backport-after-042-stable,
     Severity:  Normal   |  consider-backport-if-needed, diagnostics,
                         |  042-should, 035-backport-maybe, 040-backport-
                         |  maybe, 041-backport-maybe, regression,
                         |  BugSmashFund
Actual Points:           |  Parent ID:  #31614
       Points:           |   Reviewer:
      Sponsor:           |
-------------------------+-------------------------------------------------
 Otherwise, the mutex could be locked by another thread, and destroying a
 locked mutex triggers undefined behaviour.

 Part of #31614.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31735>
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