When you click that [x] icon from the UI, the following things happen:
Browser sends a request to the server.
The server interrupts (via Thread.interrupt()) the thread (AKA executor thread) that is responsible for carrying out a build.
The server returns
At this point, your browser is back, but the actual abort process happens from here asynchronously.
The thread gets the interrupt signal. How quickly this happens depends on what the executor is doing at the time of the interruption. Specifically, an executor thread can only be interrupted in "interruption points" due to the Java design.
Waiting for a completion of a child process (for example, maybe the build is running Ant) is an interruption point. That means if the executor was doing that, it gets interrupted instantaneously.
Waiting for a computation on an agent is an interruption point.
Waiting for file or network I/O is not an interruption point. This often causes the problem where a build appears to be un-abortable. For example, checking out a Subversion repository falls in this category.
Normal computation is also not an interruption point.
The executor performs a clean up operation. This depends on what it was doing by the time it noticed the interruption.
If it was waiting for a completion of a child process, Jenkins will
search for all the descendant processes and kill them all. On Unix, this
is done through
java.lang.UnixProcess.destroyProcess, which sends
SIGTERM on Unix-based JDK implementations. On Windows,
this is done through
If it was waiting for a completion of some computation in an agent, the thread that’s performing the remote computation is interrupted asynchronously. How quickly that threads gets interrupted depends on what that thread is doing. See above.
Executor starts unwinding the stack, and eventually it finishes the unwinding. At this point, the build is marked as aborted and executor returns to the idle status.
Pipeline jobs can be stopped by sending an HTTP POST request to URL endpoints of a build.
BUILD ID URL/stop - aborts a Pipeline.
BUILD ID URL/term - forcibly terminates a build (should only be
stop does not work).
BUILD ID URL/kill - hard kill a pipeline. This is the most
destructive way to stop a pipeline and should only be used as a last
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