#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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Old description:
> Looks like the snowflake broker isn't serving metrics since 2019-11-14
> (which happens to coincide with the host migration.
>
> At first I thought this was a DNS issue and filed #32570, but even when I
> manually fetch https://snowflake-broker.torproject.net/metrics I'm
> getting outdated metrics.
>
> I've attached the result of the above fetch as well as the metrics file
> located on the snowflake broker host that the broker *should* be reading
> from.
New description:
There is a race condition with the snowflake heap that has been causing
the broker to crash several times a day. This race condition has existed
in the broker for several years, but some recent updates as well as the
host migration managed to shake it loose.
----
This race condition is causing the snowflake broker to crash repeatedly
and often since the migration. We noticed because CollecTor stopped
collecting metrics since the restart on 14 November 2019.
--
Comment (by cohosh):
Just updating the summary of this ticket to reflect the actual problem.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32576#comment:6>
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