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    • Linus Torvalds's avatar
      Merge tag 'urgent-rcu.2023.04.07a' of... · 0d3eb744
      Linus Torvalds authored
      Merge tag 'urgent-rcu.2023.04.07a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
      
      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
      0d3eb744