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https://issues.apache.org/jira/browse/TS-4796?focusedWorklogId=28055&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-28055
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ASF GitHub Bot logged work on TS-4796:
--------------------------------------
Author: ASF GitHub Bot
Created on: 03/Sep/16 18:02
Start Date: 03/Sep/16 18:02
Worklog Time Spent: 10m
Work Description: Github user atsci commented on the issue:
https://github.com/apache/trafficserver/pull/947
FreeBSD build *successful*! See
https://ci.trafficserver.apache.org/job/Github-FreeBSD/691/ for details.
Issue Time Tracking
-------------------
Worklog Id: (was: 28055)
Time Spent: 3h 50m (was: 3h 40m)
> ATS not closing origin connections on first RST from client
> -----------------------------------------------------------
>
> Key: TS-4796
> URL: https://issues.apache.org/jira/browse/TS-4796
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Reporter: Thomas Jackson
> Assignee: Thomas Jackson
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> *TLDR; similar to TS-4720 -- slower to close than it should, instead of never
> closing*
> As a continuation of TS-4720, while testing that the session is closed when
> we expect-- I found that it isn't.
> Although we are now closing the sessions, we aren't doing it as quickly as we
> should. In this client abort case we expect the client to abort, and ATS
> should initially continue to send bytes to the client-- as we are in the
> half-open state. After the first set of bytes are sent to the client-- the
> client will send an RST-- which should signal ATS to stop sending the request
> (and tear down the origin connection etc.).
> I'm able to reproduce this locally, and the debug output (with some
> additional comments) looks like below:
> {code}
> < FIN FROM CLIENT >
> [Aug 29 18:25:07.491] Server {0x7effa538a800} DEBUG: <HttpSM.cc:2649
> (main_handler)> (http) [0] [HttpSM::main_handler, VC_EVENT_EOS]
> [Aug 29 18:25:07.491] Server {0x7effa538a800} DEBUG: <HttpSM.cc:892
> (state_watch_for_client_abort)> (http) [0]
> [&HttpSM::state_watch_for_client_abort, VC_EVENT_EOS]
> < RST FROM CLIENT >
> Got an HttpTunnel event 100
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:1173
> (producer_handler)> (http_tunnel) [0] producer_handler [http server
> VC_EVENT_READ_READY]
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:1108
> (producer_handler_chunked)> (http_tunnel) [0] producer_handler_chunked [http
> server VC_EVENT_READ_READY]
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:203
> (read_size)> (http_chunk) read chunk size of 15 bytes
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:279
> (read_chunk)> (http_chunk) completed read of chunk of 15 bytes
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:1213
> (producer_handler)> (http_redirect) [HttpTunnel::producer_handler]
> enable_redirection: [1 0 0] event: 100
> Got an HttpTunnel event 101
> [Aug 29 18:25:13.062] Server {0x7effa538a800} DEBUG: <HttpTunnel.cc:1373
> (consumer_handler)> (http_tunnel) [0] consumer_handler [user agent
> VC_EVENT_WRITE_READY]
> write ready consumer_handler
> {code}
> In this situation the connection doesn't close here at the RST-- but rather
> on the next set of bytes from the origin to send-- which end up tripping a
> VC_EVENT_ERROR-- and tearing down the connection.
> When the client sends the first RST epoll returns a WRITE_READY event --
> which the HTTPTunnel consumer ignores completely. It seems then that when we
> recieve the WRITE_READY event we need to determine if we are already in the
> writing state-- and if so, then we should stop the transaction (since we are
> already edge-triggered).
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