After some time, a javascript error occurs when browsing a project page.

SyntaxError: missing ( before formal parameters
function build_id-1719326292(a) {

The side-effect is that when clicking on Build now (or another link that uses the same system to generate a POST request), we get redirected to a page telling us we should use the POST method.

I've narrowed down the problem to https://github.com/jenkinsci/jenkins/commit/3c01366e0bc5c3e8de23eb7337e8c3e4dbd7843c which introduced usage of Functions#generateId()

However, the iota used is an int, so after some time, it overflows, and becomes negative.

the issue is that it seems javascript functions cannot contain the character -, hence the problem.

The problem affects Jenkins 1.520+.