tree f921aade8607a4d8e76bcbce36c04b805536618a
parent 2ad2ed46262a19b6012fe0ceb0243fe04aff9b71
author Christopher Faulet <cfaulet@haproxy.com> 1635512159 +0200
committer Willy Tarreau <w@1wt.eu> 1635927472 +0100
encoding latin1

BUG/MEDIUM: stream-int: Block reads if channel cannot receive more data

First of all, we must be careful here because this part was modified and
each time, this introduced a bug. But, in si_update_rx(), we must not
re-enables receives if the channel buffer cannot receive more
data. Otherwise the multiplexer will be wake up for nothing. Because the
stream is woken up when the multiplexer is waiting for more room to move on,
this may lead to a ping-pong loop between the stream and the mux.

Note that for now, it does not fix any known bug. All reported issues in
this area were fixed in another way.

This patch must be backported with a special care. Technically speaking, it
may be backported as far as 2.0.

(cherry picked from commit 69fad00ebf65ad0dedabaf10db43fb3783f7ecae)
Signed-off-by: Willy Tarreau <w@1wt.eu>