Merge tag 'urgent-rcu.2023.04.07a' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull RCU fix from Paul McKenney:
 "This fixes a pair of bugs in which an improbable but very real
  sequence of events can cause kfree_rcu() to be a bit too quick about
  freeing the memory passed to it.

  It turns out that this pair of bugs is about two years old, and so
  this is not a v6.3 regression. However: (1) It just started showing up
  in the wild and (2) Its consequences are dire, so its fix needs to go
  in sooner rather than later.

  Testing is of course being upgraded, and the upgraded tests detect
  this situation very quickly. But to the best of my knowledge right
  now, the tests are not particularly urgent and will thus most likely
  show up in the v6.5 merge window (the one after this coming one).

  Kudos to Ziwei Dai and his group for tracking this one down the hard
  way!"

* tag 'urgent-rcu.2023.04.07a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
  rcu/kvfree: Avoid freeing new kfree_rcu() memory after old grace period