When I create a pipeline job with the following Jenkinsfile (not from SCM):

properties([pipelineTriggers([pollSCM('H/2 * * * *')])])

node() {
git(url: 'https://github.com/amezin/jenkins-cant-stop-polling.git', poll: false)
}

I expect that it won't be triggered when I push something to https://github.com/amezin/jenkins-cant-stop-polling

However, it becomes triggered by SCM change. Polling log ends with "Changes found".

Real use case is more complex and involves a custom SCM plugin, but this simple pipeline with git step behaves the same way.

As a workaround, I'll add 'poll' option to our custom SCM plugin (and make its compareRemoteRevisionWith() return NO_CHANGES when set to false). I do not know any workaround for Git and Mercurial plugins (I'd prefer not to build a custom patched version of these).