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It is possible to trigger a loop of tasklets calls if a QUIC connection is interrupted abruptly by the client. This is caused by the following interaction : * FD iocb is woken up for read. This causes a wakeup on quic_conn tasklet. * quic_conn_io_cb is run and try to read but fails as the connection socket is closed (typically with a ECONNREFUSED). FD read is subscribed to the poller via qc_rcv_buf() which will cause the loop. The looping will stop automatically once the idle-timeout is expired and the connection instance is finally released. To fix this, ensure FD read is subscribed only for transient error cases (EAGAIN or similar). All other cases are considered as fatal and thus all future read operations will fail. Note that for the moment, nothing is reported on the quic_conn which may not skip future reception. This should be improved in a future commit to accelerate connection closing. This bug can be reproduced on a frequent occurence by interrupting the following command. Quic traces should be activated on haproxy side to detect the loop : $ ngtcp2-client --tp-file=/tmp/ngtcp2-tp.txt \ --session-file=/tmp/ngtcp2-session.txt \ -r 0.3 -t 0.3 --exit-on-all-streams-close 127.0.0.1 20443 \ "http://127.0.0.1:20443/?s=1024" This must be backported up to 2.7.
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)