Github user SolidWallOfCode commented on the issue:
https://github.com/apache/trafficserver/pull/1006
Looking that the checks for `m_active` there is an apparently assumption
that the value can change over the course of the
`HttpSM::setup_internal_transfer`. Give the instance pointed at by `ua_session`
should be locked along with the `HttpSM` instance, how can that happen? Even
without locks any such change must happen in another thread in which case the
member really needs to be `volatile`.
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