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This old bug was revealed because of the commit 407210a34 ("BUG/MEDIUM:
stconn: Don't rearm the read expiration date if EOI was reached"). But it is
still possible to hit it if there is no server timeout. At first glance, the
2.8 is not affected. But the fix remains valid.
When a shutdown for writes if performed the H1 connection must be notified
to be released. If it is subscribed for any I/O events, it is not an
issue. But, if there is no subscription, no I/O event is reported to the H1
connection and it remains alive. If the message was already fully received,
nothing more happens.
On my side, I was able to trigger the bug by freezing the session. Some
users reported a spinning loop on process_stream(). Not sure how to trigger
the loop. To freeze the session, the client timeout must be reached while
the server response was already fully received. On old version (< 2.6), it
only happens if there is no server timeout.
To fix the issue, we must wake up the H1 connection on shutdown for writes
if there is no I/O subscription.
This patch must be backported as far as 2.0. It should fix the issue #2090
and #2088.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)