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Error with octomap_server: "process has died, exit code -6"

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I am trying to use `octomap_server` (`octomap_mapping.launch` file) for building a 3D map using point cloud data from velodyne. So i drive my robot around, record all sensor data for `octomap_server` to post process it on my desktop. I really want to play the rosag at slower rate so that I can get a better 3D map, but unfortunately the slower I run the rosbag more I get the following error (process has died, exit code -6): terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc Once this error occurs, I have to restart `octomap_server` and then I loose the previously saved 3D map. If I play my `rosbag` at more than 2x speed, then `octomap_server` doesn't fail but I don't get a good 3D map. Does someone have anything on why am I getting this error? Also, sometimes the following error pops up, I don't know what that means but it doesn't seem to effect octomap processing. Can someone throw some light on this too. [ERROR] [1412812984.342799452]: Error serializing OctoMap

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