commit 796ff4d975bde2bb7fda2876a31bbdc697c2b2ba
Author: William Lallemand <wlallemand@haproxy.com>
Date:   Tue Jan 14 15:25:02 2020 +0100

    BUG/MINOR: cli/mworker: can't start haproxy with 2 programs
    
    When trying to start HAProxy with the master CLI and more than one
    program in the configuration, it refuses to start with:
    
    [ALERT] 013/132926 (1378) : parsing [cur--1:0] : proxy 'MASTER', another server named 'cur--1' was already defined at line 0, please use distinct names.
    [ALERT] 013/132926 (1378) : Fatal errors found in configuration.
    
    The problem is that haproxy tries to create a server for the MASTER
    proxy but only the worker are supposed to be in the server list.
    
    Fix issue #446.
    
    Must be backported as far as 2.0.
    
    (cherry picked from commit a31b09e982a76cdf8761edb25d1569cb76a8ff37)
    Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>

diff --git a/src/cli.c b/src/cli.c
index 77db8be88..d68e2b299 100644
--- a/src/cli.c
+++ b/src/cli.c
@@ -2455,6 +2455,10 @@ int mworker_cli_proxy_create()
 		int port1, port2, port;
 		struct protocol *proto;
 
+		/* only the workers support the master CLI */
+		if (!(child->options & PROC_O_TYPE_WORKER))
+			continue;
+
 		newsrv = new_server(mworker_proxy);
 		if (!newsrv)
 			goto error;