How can we kill all the background jobs (running or not) in the current shell?

From https://unix.stackexchange.com/a/43709/674

To just kill all background jobs managed by bash, do

kill $(jobs -p) 

Does kill $(jobs -p) kill only those "running" background jobs in the current shell, but not those background jobs in the shell which are in "stopped" or some other states?

How can we kill all the background jobs in the current shell, regardless of whether they are in running, stopped or some other states?

For example, I created two stopped jobs, by running less and then ctrl+z:

$ ps | less [1]+ Stopped ps | less $ less recover_jobs.sh [2]+ Stopped less recover_jobs.sh $ jobs -l [1]- 2753 Done ps 2754 Stopped | less [2]+ 2842 Stopped less recover_jobs.sh $ jobs -p 2753 2842 $ kill $(jobs -p) bash: kill: (2753) - No such process $ kill 2754 $ kill 2842 $ jobs -l [1]- 2753 Done ps 2754 Stopped | less [2]+ 2842 Stopped less recover_jobs.sh $ fg 1 ps | less Terminated $ fg 2 less recover_jobs.sh Terminated 

I was wondering why:

• kill $(jobs -p) doesn't kill any stopped job,

• jobs -p doesn't show the pid 2754 of the stopped job | less, but the pid 2753 of the done job ps,

• kill 2754 and kill 2842 don't kill the stopped jobs for | less and for less recover_jobs.sh, and
• when I fg the stopped jobs, they are immediately shown Terminated but not before I fg them?

Thanks.