tree 0b775ca25a07ea2155922ae531d7080079c75702
parent 1c759956112996245eaccbf20e2506b9c9cbceb2
author Willy Tarreau <w@1wt.eu> 1575997924 +0100
committer Willy Tarreau <w@1wt.eu> 1576001355 +0100
encoding latin1

BUG/MEDIUM: proto_udp/threads: recv() and send() must not be exclusive.

This is a complement to previous fix for bug #399. The exclusion between
the recv() and send() calls prevents send handlers from being called if
rx readiness is reported. The DNS code can trigger this situations with
threads where the fd_recv_ready() flag disappears between the test in
dgram_fd_handler() and the second test in dns_resolve_recv() while a
thread calls fd_cant_recv(), and this situation can sustain itself for
a while. With 8 threads and an error in the socket queue, placing a
printf on the return statement in dns_resolve_recv() scrolls very fast.

Simply removing the "else" in dgram_fd_handler() addresses the issue.

This fix must be backported as far as 1.6.