"STOP" appears in terminal by itself.

[samanehghassabi]

I am running multiple jobs on background on CentOS 6.5, runs finish normally but I start to see this in the terminal:
# STOP
STOP
STOP
STOP
STOP
STOP
STOP
STOP
STOP
STOP
STOP
STOP
..
and this continues to appear for each job until I abort by Ctrl +C. I couldn't find anything on forums related to this, can someone please tell me what is going on?
thanks

[avij]

It is your background job that outputs that STOP. Try running one in the foreground and see if you see the STOP.

[samanehghassabi]

It is your background job that outputs that STOP. Try running one in the foreground and see if you see the STOP.

I run it in both ways, they both generated "STOP" in terminal when finished, It is actually a fortran code I run like thousand times before in both ways and never had this "STOP" before!

[avij]

Well, now you do. If you don't like the STOP, modify your background job to not output the STOP, or redirect the output to /dev/null: ./backgroundtask > /dev/null 2>&1 &

[samanehghassabi]

I will leave this question unsolved, I need to know why it is happening. please share your ideas.
Thanks

[avij]

Perhaps there's a bug in your application? Just a wild guess.