merge-script 302733fd96 Merge bitcoin/bitcoin#35652: init: fix reindex deadlock by waking cv after interrupt
c1313b199f init: wake genesis wait after ImportBlocks() returns (ismaelsadeeq)

Pull request description:

  During startup with `-reindex`, the block index and chainstate are wiped, and
  the normal `LoadGenesisBlock()` startup path is skipped while block files are
  being indexed. The init thread can then wait for genesis to be processed via the
  tip-block condition variable.

  If shutdown is requested after the init thread enters that wait but before the
  import thread activates genesis, the reindex scan can return early without
  calling the later `LoadGenesisBlock()` fallback or `ActivateBestChains()`.
  Because no block tip is connected, the block-tip notification never fires. The
  wait predicate would accept `ShutdownRequested(node)`, but it is not evaluated
  again unless the condition variable is notified.

  Notify the tip-block condition variable after `ImportBlocks()` returns so the
  genesis wait can observe shutdown and exit cleanly.

  Described in detail https://github.com/bitcoin/bitcoin/pull/35621#issuecomment-4876059120

  The current test covers the path, but won't fail deterministically. You can use L0rinc suggested patch for a deterministic patch that demonstrate the deadlock on master https://github.com/bitcoin/bitcoin/pull/35652#pullrequestreview-4627988553

ACKs for top commit:
  maflcko:
    review ACK c1313b199f 🦁
  mzumsande:
    Code Review ACK [c1313b1](c1313b199f)
  sedited:
    tACK c1313b199f

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