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BUG/MEDIUM: servers: Attempt to reuse an unfinished connection on retry.

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In connect_server(), if the previous connection failed, but had an alpn, no
mux was created, and thus the stream_interface's endpoint would be the
connection. In this case, instead of forgetting about it, and overriding
the stream_interface's endpoint later, try to reuse the connection, or the
connection will still be in the session's connection list, and will reference
to a stream that was probably destroyed.

This should be backported to 1.9.
This commit is contained in:
Olivier Houchard 2019-01-28 15:33:15 +01:00 committed by Willy Tarreau
parent 13afcb7ab3
commit 9ef5155ba6
1 changed files with 18 additions and 7 deletions
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25
src/backend.c
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@ -1154,14 +1154,25 @@ int connect_server(struct stream *s)
* to use it.
*/
srv_cs = objt_cs(s->si[1].end);
if (srv_cs) {
old_conn = srv_conn = cs_conn(srv_cs);
if (old_conn && (!old_conn->target || old_conn->target == s->target)) {
old_conn->flags &= ~(CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH);
srv_cs->flags &= ~(CS_FL_ERROR | CS_FL_EOS | CS_FL_REOS);
if (!srv_cs)
srv_conn = objt_conn(s->si[1].end);
else
srv_conn = cs_conn(srv_cs);
if (srv_conn) {
if (!srv_conn->target || srv_conn->target == s->target) {
srv_conn->flags &= ~(CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH);
if (srv_cs)
srv_cs->flags &= ~(CS_FL_ERROR | CS_FL_EOS | CS_FL_REOS);
reuse = 1;
old_conn = srv_conn;
} else {
srv_conn = NULL;
si_release_endpoint(&s->si[1]);
}
} else {
}
if (!old_conn) {
struct sess_srv_list *srv_list;
list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
if (srv_list->target == s->target) {
@ -1301,7 +1312,7 @@ int connect_server(struct stream *s)
/* We already created a cs earlier when using http_proxy, so
* only create a new one if we don't have one already.
*/
if (!srv_cs) {
if (!srv_cs && srv_conn->mux) {
int avail = srv_conn->mux->avail_streams(srv_conn);
if (avail <= 1) {