c1313b199finit: 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 ACKc1313b199f🦁 mzumsande: Code Review ACK [c1313b1](c1313b199f) sedited: tACKc1313b199fTree-SHA512: b17faaa2042882f2acebf688f4a28fd6bb11cc5d7f978991fe2bcba7a9df6ed82a0a2811f2e71a929189570a7926f148afdbeef5c1ca57a081e3bb914c2f6fe2
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