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BUG/MEDIUM: stats: show servers state may show an servers from another backend

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Olivier Doucet reported that "show servers state" was producing an invalid
output with some configurations where nbproc > 1.

Indeed, commit 76a99784f4 fixed some issues but unfortunately introduced a
regression when a backend bound to the same process as the stats socket and a
previous backend is bound to another one.

For example :
  global
    daemon
    nbproc 2
    stats socket /var/run/haproxy-1.sock process 1
    stats socket /var/run/haproxy-2.sock process 2

  listen proc1
    bind 127.0.0.1:9001
    bind-process 1
    server WRONG 127.0.0.1:80

  listen proc2
    bind 127.0.0.1:9002
    bind-process 2
    server RIGHT 127.0.0.1:80

Requesting "show servers state" on /var/run/haproxy-2.sock was producing a line
like :
3 proc2 1 WRONG 127.0.0.1 2 0 1 1 4 1 0 2 0 0 0 0

whereas the line below was awaited :
3 proc2 1 RIGHT 127.0.0.1 2 0 1 1 5 1 0 2 0 0 0 0

This was caused by the initialization of the server loop too early, before the
bind_proc filtering whereas it should be done after.

This fix should be backported to 1.6, where the regression has unfortunately
been backported.
This commit is contained in:
Cyril Bont 2016-05-27 00:06:45 +02:00 committed by Willy Tarreau
parent 659fbf0230
commit d55bd7a6a9
1 changed files with 3 additions and 2 deletions
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5
src/dumpstats.c
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@ -3076,6 +3076,9 @@ static int dump_servers_state(struct stream_interface *si, struct chunk *buf)
if (appctx->ctx.server_state.px->bind_proc && !(appctx->ctx.server_state.px->bind_proc & (1UL << (relative_pid - 1))))
return 1;
if (!appctx->ctx.server_state.sv)
appctx->ctx.server_state.sv = appctx->ctx.server_state.px->srv;
for (; appctx->ctx.server_state.sv != NULL; appctx->ctx.server_state.sv = srv->next) {
srv = appctx->ctx.server_state.sv;
srv_addr[0] = '\0';
@ -3178,8 +3181,6 @@ static int stats_dump_servers_state_to_buffer(struct stream_interface *si)
for (; appctx->ctx.server_state.px != NULL; appctx->ctx.server_state.px = curproxy->next) {
curproxy = appctx->ctx.server_state.px;
if (!appctx->ctx.server_state.sv)
appctx->ctx.server_state.sv = appctx->ctx.server_state.px->srv;
/* servers are only in backends */
if (curproxy->cap & PR_CAP_BE) {
if (!dump_servers_state(si, &trash))