Hi, On 2013-06-17 16:16:22 +0200, Andres Freund wrote: > When postgres on linux receives connection on a high rate client > connections sometimes error out with: > could not send data to server: Transport endpoint is not connected > could not send startup packet: Transport endpoint is not connected > > To reproduce start something like on a server with sufficiently high > max_connections: > pgbench -h /tmp -p 5440 -T 10 -c 400 -j 400 -n -f /tmp/simplequery.sql > > Now that's strange since that error should happen at connect(2) time, > not when sending the startup packet. Some investigation led me to > fe-secure.c's PQConnectPoll:
> So, we're accepting EWOULDBLOCK as a valid return value for > connect(2). Which it isn't. EAGAIN in contrast is on some BSDs and on > linux. Unfortunately POSIX allows those two to share the same value... > > My manpage tells me: > EAGAIN No more free local ports or insufficient entries in the routing cache. > For > AF_INET see the description of > /proc/sys/net/ipv4/ip_local_port_range ip(7) > for information on how to increase the number of local > ports. > > So, the problem is that we took a failed connection as having been > initially successfull but in progress. > > Not accepting EWOULDBLOCK in the above if() results in: > could not connect to server: Resource temporarily unavailable > Is the server running locally and accepting > connections on Unix domain socket "/tmp/.s.PGSQL.5440"? > > which makes more sense. > > Trivial patch attached. Could I convince a committer to NACK or commit & backpatch that patch? It has come up before: http://www.postgresql.org/message-id/CAMnJ+Beq0hCBuTY_=nz=ru0u-no543_raeunlvsayu8tugd...@mail.gmail.com possibly also: http://lists.pgfoundry.org/pipermail/pgpool-general/2007-March/000595.html Greetings, Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
