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@oknet oknet commented Jan 11, 2019

The vc->add_to_keep_alive_queue() is called by:

  • Http1ClientSession::release()
  • Http2ClientSession::cleanup_streams()
  • Http2ClientSession::release_stream()

And the NetHandler::remove_from_active_queue() is called by
vc->add_to_keep_alive_queue().

The NetHandler::keep_alive_queue and NetHandler::active_queue are
internal queue of NetHandler. We must have acquired the NetHandler's
lock before doing anything with them.

When reenable a HttpSM from plugin, the HttpSM would be run into ethread
that different from client_vc lives because TSHttpSMCallback is
scheduled by eventProcessor.schedule_imm().

(cherry picked from commit c929ed6)

…ead-safe

The `vc->add_to_keep_alive_queue()` is called by:
  - Http1ClientSession::release()
  - Http2ClientSession::cleanup_streams()
  - Http2ClientSession::release_stream()

And the `NetHandler::remove_from_active_queue()` is called by
`vc->add_to_keep_alive_queue()`.

The NetHandler::keep_alive_queue and NetHandler::active_queue are
internal queue of NetHandler. We must have acquired the NetHandler's
lock before doing anything with them.

When reenable a HttpSM from plugin, the HttpSM would be run into ethread
that different from client_vc lives because TSHttpSMCallback is
scheduled by `eventProcessor.schedule_imm()`.

(cherry picked from commit c929ed6)
@oknet oknet added this to the 7.1.6 milestone Jan 11, 2019
@oknet oknet self-assigned this Jan 11, 2019
@oknet oknet requested a review from zwoop January 11, 2019 06:29
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oknet commented Jan 11, 2019

@zwoop backport #4379 for 7.1.x.

@zwoop zwoop merged commit 3599e5e into apache:7.1.x Jan 11, 2019
@zwoop zwoop added the Backport Marked for backport for an LTS patch release label Jan 30, 2019
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zwoop commented Mar 14, 2019

hmmm this is causing issues on the 7.1.x branch, and unclear what it fixes honestly. I'm thinking we should revert this for now. @ezelkow1

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