I recently upgraded the lib of one of my apps from 1.7.3 to 1.8.0-RC. I saw that something wasn't working a day later in my Grafana. After some investigations and deductions, I figured out that this bump caused functions not being executed, something had to do with locks.

After some time, I very professionally (using lots of printlns) debugged the whole code related to that feature. I found the bug out:

fun test() {
  mutex.withLock {
    return
  }
}

This doesn't release the lock. Why? Because someone decided to remove finally of that damn thing in #3881 .

https://kotlinlang.org/docs/inline-functions.html this even shows how to make a lock function which works. This will break a lot of code which relies on of having a finally out there.