[tor-bugs] #31614 [Core Tor/Tor]: Implement clean_up_backtrace_handler()

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#31614: Implement clean_up_backtrace_handler()
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.2.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.5.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  consider-backport-after-042-stable,  |  Actual Points:  0.4
  consider-backport-if-needed, diagnostics,      |
  042-should, 035-backport-maybe, 040-backport-  |
  maybe, 041-backport-maybe, regression,         |
  BugSmashFund                                   |
Parent ID:                                       |         Points:  0.2
 Reviewer:  nickm                                |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Nick, do you think we should backport the commit that destroys the
 backtrace signal handler?
 Otherwise we'll trigger undefined behaviour when Tor is re-initialised.
 (But I'm not sure if we should backport, it seems risky.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31614#comment:19>
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