[tor-bugs] #32576 [Circumvention/Snowflake]: Fix race condition in snowflake broker

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#32576: Fix race condition in snowflake broker
-------------------------------------+------------------------------
 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  needs_review
 Priority:  Very High                |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  metrics                  |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:  phw                      |        Sponsor:  Sponsor28
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Changes (by cohosh):

 * reviewer:   => phw


Comment:

 Alright I modified the patch and added a test that produce a data race
 before the patch but pass afterwards. This is definitely ready for a
 review.

 For a broker update: the broker hasn't crashed for over 2 days so we have
 some recent metrics:
 https://metrics.torproject.org/collector/recent/snowflakes/

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32576#comment:11>
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