Proxy xxx failed to enter pause mode.

Hi list,

my haproxy v1.3.15.4 fails to enter pause mode on SIGTTOU. Anybody have an idea how to fix this?

Output (on SIGTTOU):

[WARNING] 319/114301 (13817) : Pausing proxy webserver.
[WARNING] 319/114301 (13817) : Proxy webserver failed to enter pause mode.
[WARNING] 319/114301 (13817) : Pausing proxy appserver.
[WARNING] 319/114301 (13817) : Proxy appserver failed to enter pause mode.
[WARNING] 319/114301 (13817) : Pausing proxy front.
[WARNING] 319/114301 (13817) : Some proxies refused to pause, performing soft stop now.
[WARNING] 319/114301 (13817) : Stopping proxy webserver in 0 ms.
[WARNING] 319/114301 (13817) : Stopping proxy appserver in 0 ms.
[WARNING] 319/114301 (13817) : Stopping proxy front in 0 ms.
[WARNING] 319/114301 (13817) : Proxy webserver stopped.
[WARNING] 319/114301 (13817) : Proxy appserver stopped.
[WARNING] 319/114301 (13817) : Proxy faceplate stopped.

Using this config:

defaults

    mode http
    option forwardfor
    option httpclose
    option abortonclose

    timeout check 10000
    timeout client 10000
    timeout connect 10000
    timeout server 10000

frontend front *:9090

    maxconn 10000
    acl static_content url_beg /media/
    use_backend webserver if static_content     default_backend appserver

backend appserver

    balance leastconn
    cookie C insert indirect nocache
    option persist
    option redispatch
    option allbackups
    option httpchk HEAD /health HTTP/1.0     fullconn 200
    server app1 192.168.1.1:8080 weight 1 minconn 3 maxconn 100 cookie a1 check inter 5000

backend webserver

    balance roundrobin
    option httpchk HEAD / HTTP/1.0
    fullconn 1000
    server web1 192.168.1.1:7070 weight 1 minconn 10 maxconn 1000 check inter 60000 Received on 2008/11/15 19:29