Hey there,
I'm having an issue on debian 9's stable version of HAProxy : https://dooby.fr/y/j9qgknb I have to regularly reload haproxy to fetch new configurations, and it now always result on a set of undying pids. If I strace pid 2677 on this screenshot : $ strace -p 2677 strace: Process 2677 attached epoll_wait(0, [], 200, 18) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 12) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 14) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 13) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 121) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 6) = 0 epoll_wait(0, [], 200, 0) = 0 epoll_wait(0, [], 200, 22) = 0 if I check what's going on on the network level for this pid : $ ss -lntpuae |grep -i 'pid=2677' udp UNCONN 0 0 *:28382 *:* users:(("haproxy",pid=2677,fd=14),("haproxy",pid=2611,fd=14)) ino:1822334707 sk:aa61 --> and I have nothing going on on that socket : $ timeout 60 tcpdump -i any -w udp.out -vvvvX 'udp port 28382' tcpdump: listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes Got 0 My systemd.service file has only been edited to enlarge my fd : [Unit] Description=HAProxy Load Balancer Documentation=man:haproxy(1) Documentation=file:/usr/share/doc/haproxy/configuration.txt.gz After=network.target syslog.service Wants=syslog.service [Service] Environment="CONFIG=/etc/haproxy/haproxy.cfg" "PIDFILE=/run/haproxy.pid" EnvironmentFile=-/etc/default/haproxy ExecStartPre=/usr/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS ExecStart=/usr/sbin/haproxy-systemd-wrapper -f $CONFIG -p $PIDFILE $EXTRAOPTS ExecReload=/usr/sbin/haproxy -f $CONFIG -c -q $EXTRAOPTS ExecReload=/bin/kill -USR2 $MAINPID KillMode=mixed Restart=always LimitNOFILE=1048576 [Install] WantedBy=multi-user.target So I'm wondering what's going wrong on a reload. The only solution that I've found so far is to kick out my load balancer from the pool, stop haproxy properly and start it again.
