[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:  assigned
 Priority:  Very High                |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:  metrics                  |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:  Sponsor28
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Comment (by dcf):

 Replying to [comment:4 cohosh]:
 > The weird thing is that the #29207 update was deployed on the old broker
 at the same time but hasn't caused any problems. It's possible this was
 due to the DNS update to point to the new broker, but as seen from the
 metrics data, the old broker was still getting a lot of proxy polls for
 several days after.

 Perhaps because the old broker had 1 CPU core and the new one has 2 CPU
 cores? I can imagine that might affect goroutine scheduling which might
 affect the visibility of race conditions.

 You might try setting `GOMAXPROCS=1` in /etc/service/snowflake-broker/run
 as a temporary workaround, if indeed it helps.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32576#comment:7>
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