I have the same problem when qt creator does code completion, for an example I 
type ROS_INFO.
I have found a solution which may solve your problem. 
I change code model from buit-in to clang following tutorials in the below link:
http://doc.qt.io/qtcreator/creator-clang-codemodel.html.
And qt creator does not crash again.
Good Luck!

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https://bugs.launchpad.net/bugs/1577213

Title:
  qtcreator freezes and crashes all the time

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