a list of what functions have been called in order to reach a certain point in a program
a subclass of array, converting it to a string will create a trace from innermost to outermost call, inspecting it will reveal the actual function objects that make up the array
a trace of the function which have been called before lighttpd died
A backtrace is a trace of a series of function calls showing how a program arrived to a certain point. It is used mainly for finding and correcting bugs (q.v.). Emacs can display a backtrace when it signals an error or when you type C-g (see `quitting'). See section AD.10.3 Checklist for Bug Reports.
A collection of information on the control flow of the program, gathered by the debugger. Also the display of this information produced by the debugger. The backtrace includes data on goals that were called but not exited and also on goals that exited nondeterminately.