Jenkinsfile is creating ~24 sub-jobs and running 5 of them at a time in parallel.
Each sub-job is running up to 5 VMs that need to be cleaned up on abort to make room for the next jobs.

The only time I have seen abort work on the first click is when all of the jobs are in the queue and none of them are running. Every other time, the console output has given me "Click here to forcibly terminate running steps" and later "Click here to forcibly kill entire build", and if i don't click those links, the job will stick around for days.
In this instance, i've created two support bundles, at the times indicated.

When I went to manually clean up the VMs, i found that 2 out of 5 of the workspaces had been successfully cleaned up before I got there, but all 5 workspaces look the same from the POV of the console output...they all look like they failed to abort.

=============================================================
Aborted by LeahKlearman

...............................................................................................................................................................................................................................................................................................................................................Sending interrupt signal to process
..........................................................Sending interrupt signal to process
Sending interrupt signal to process
Sending interrupt signal to process
Sending interrupt signal to process
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[Pipeline] // node
[looks like all the queued sub-jobs have been successfully canceled here]

Click here to forcibly terminate running steps
[clicked "forcibly terminate running steps" now and created bundle support_2016-08-29_20.44.15]
Terminating sh
Terminating sh
Terminating sh
Terminating sh
Terminating sh

[output from one of the jobs]

Click here to forcibly kill entire build
[clicked "forcibly kill entire build" now and created support_2016-08-29_20.45.14]
Hard kill!
=============================================================