stack smashing detected

[mahesh]

I am working with an aws instance, linux OS. I tried the following command line:
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scp     -i     xyz.pem     path/of/filename/on/ubuntu/machine     ec2-user@xx.xx.xx.xx:destination/folder/on/aws/instance
wiith the intention of transferring the file. But it threw an error log as follows.

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*** stack smashing detected ***: terminated   lost connection
This kind of error never happened before. I have used the above command line many times successfully in the past.
Error logs like this appear when I log into the aws instance, while using some commands like "ls" too. Also I am unable to upload files also from my ubuntu m/c into the aws instance m/c also since then.
May I know what is this problem and how to overcome it ?

Thanks