commit 4c82743abd299f0aa8105e98ec92b76375a7f344
Author: Olivier Houchard <ohouchard@haproxy.com>
Date:   Thu Mar 7 14:19:24 2019 +0100

    BUG/MEDIUM: logs: Only attempt to free startup_logs once.
    
    deinit_log_buffers() can be called once per thread, however startup_logs
    is common to all threads. So only attempt to free it once.
    
    This should be backported to 1.9 and 1.8.
    
    (cherry picked from commit 7c49711d6041d1afc42d5b310ddfd7d6f6817c3c)
    Signed-off-by: William Lallemand <wlallemand@haproxy.org>
    (cherry picked from commit bc3e21b27849275306a0580488613b7dfd4d8eb5)
    Signed-off-by: William Lallemand <wlallemand@haproxy.org>

diff --git a/src/log.c b/src/log.c
index b3f33662..9c112255 100644
--- a/src/log.c
+++ b/src/log.c
@@ -1380,11 +1380,15 @@ int init_log_buffers()
 /* Deinitialize log buffers used for syslog messages */
 void deinit_log_buffers()
 {
+	void *tmp_startup_logs;
+
 	free(logheader);
 	free(logheader_rfc5424);
 	free(logline);
 	free(logline_rfc5424);
-	free(startup_logs);
+	tmp_startup_logs = HA_ATOMIC_XCHG(&startup_logs, NULL);
+	free(tmp_startup_logs);
+
 	logheader         = NULL;
 	logheader_rfc5424 = NULL;
 	logline           = NULL;