# Error related to segmentation fault

* In computing, a segmentation fault (often shortened to segfault) or access violation is a fault,
or failure condition, raised by hardware with
memory protection, notifying an
operating system (OS) the software has attempted to access a restricted area of memory (a memory access violation).

* But how the hell do we know where the hell we are accessing the restricted area.

* It is a very difficult error to solve, different from its cousin syntax fault which will will indicate where is the problem.

* One way is to print something after every code block where there is a possibility of error.

* Then one can know after which code block there is problem.

* One precaution that one should take is that do not do anything with the subscribed image from the topic with the command ```newframe = cv_bridge::toCvShare(msg, "bgr8")->image``` in any ```task_handler``` node,
because anything changed to it will also change the raw ros image which we are getting from the topic ,which results into a segmentation fault.

* That was the reason of 5 hours of irritation and anxiety.