Failed to read cmd on fd

I have built up my own tile server mostly following that manual

http://switch2osm.org/serving-tiles/manually-building-a-tile-server-12-04/

I have added Tilemill to edit my maps. From Tilemill I make export to xml to make styles readable to renderd and mapnik. I also installed Tilemill and Mapnik library through package/ppa repositorys. I am also running all this on Ubuntu 13.10.


sudo add-apt-repository ppa:developmentseed/mapbox
sudo apt-get update
sudo apt-get install tilemill libmapnik nodejs libmapnik-dev

When look maps through web browser I can see everything and I can zoom everywhere but when I look into render log there is error like this renderd[24410]: DEBUG: Failed to read cmd on fd 17 which repeats many times with different numbers.

Here is my rendering log:

May 23 18:15:36 osm renderd[24410]: DEBUG: Sending render cmd(3 default 15/15768/12189) with protoco                                                                                                           l version 2 to fd 15
May 23 18:15:36 osm renderd[24410]: DEBUG: Sending render cmd(3 default 15/15769/12189) with protoco                                                                                                           l version 2 to fd 16
May 23 18:15:36 osm renderd[24410]: DEBUG: Failed to read cmd on fd 15
May 23 18:15:36 osm renderd[24410]: DEBUG: Connection 0, fd 15 closed, now 7 left
May 23 18:15:36 osm renderd[24410]: DEBUG: Failed to read cmd on fd 16
May 23 18:15:36 osm renderd[24410]: DEBUG: Connection 0, fd 16 closed, now 6 left
May 23 18:15:38 osm renderd[24410]: DEBUG: DONE TILE default 14 7880-7887 6088-6095 in 2.372 seconds
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7883/6093) with protocol                                                                                                            version 2 to fd 5
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 5
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 0, fd 5 closed, now 5 left
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7884/6092) with protocol                                                                                                            version 2 to fd 18
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 18
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 4, fd 18 closed, now 4 left
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7883/6092) with protocol                                                                                                            version 2 to fd 17
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 17
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 3, fd 17 closed, now 3 left
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7884/6094) with protocol                                                                                                            version 2 to fd 10
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 10
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 2, fd 10 closed, now 2 left
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7883/6094) with protocol                                                                                                            version 2 to fd 9
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 9
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 1, fd 9 closed, now 1 left
May 23 18:15:38 osm renderd[24410]: DEBUG: Sending render cmd(3 default 14/7884/6093) with protocol                                                                                                            version 2 to fd 8
May 23 18:15:38 osm renderd[24410]: DEBUG: Failed to read cmd on fd 8
May 23 18:15:38 osm renderd[24410]: DEBUG: Connection 0, fd 8 closed, now 0 left
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 5, number 1
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 8, number 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(5) xml(default), z(10), x(486),                                                                                                            y(385), mime(image/png), options()
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(8) xml(default), z(10), x(487),                                                                                                            y(385), mime(image/png), options()
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 9, number 3
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(9) xml(default), z(10), x(486),                                                                                                            y(384), mime(image/png), options()
May 23 18:15:40 osm renderd[24410]: DEBUG: START TILE default 10 480-487 384-391, new metatile
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 10, number 4
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(10) xml(default), z(10), x(487)                                                                                                           , y(384), mime(image/png), options()
May 23 18:15:40 osm renderd[24410]: Rendering projected coordinates 10 480 384 -> -1252344.271425|46                                                                                                           96291.017844 -939258.203569|5009377.085700 to a 8 x 8 tile
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 11, number 5
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming connection, fd 12, number 6
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(11) xml(default), z(10), x(486)                                                                                                           , y(386), mime(image/png), options()
May 23 18:15:40 osm renderd[24410]: DEBUG: Got incoming request with protocol version 2
May 23 18:15:40 osm renderd[24410]: DEBUG: Got command RenderPrio fd(12) xml(default), z(10), x(487)                                                                                                           , y(386), mime(image/png), options()

Maybe somebody can at least give some clue where my configuration is wrong

Same problem is reported in github https://github.com/openstreetmap/mod_tile/issues/77

Hmm … cannot give a solution,

but what about asking on one of the OSM related mailing lists where some more experts (dev-list) are present?

http://wiki.openstreetmap.org/wiki/Mailing_lists

Or ask maybe at http://gis.stackexchange.com ?