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Merge #27806: fuzz: Fix mini_miner_selection running out of coin
76c5ea7 fuzz: Fix mini_miner_selection running out of coin (Murch) Pull request description: Fixes a bug in the mini_miner_selection fuzz test found by fuzzing: It was possible for the mini_miner_selection fuzz test to generated transactions that created fewer new outputs than the two inputs they each spent. If the fuzz seed did so consistently, eventually it would cause a `pop_front()` on an empty available_coins which resulted in undefined behavior. Fixed per belt-suspender approach: - assert that available_coins is not empty before generating tx - generate at least two coins per new tx - allow building tx with a single input if only one coin is available ACKs for top commit: MarcoFalke: lgtm ACK 76c5ea7 dergoegge: reACK 76c5ea7 Tree-SHA512: 5b7ffd1905a712733ad5364958ad79874dd8c31bd50069b0d3e6f734da0f2d496cb08cbe0afa47115674313e1cb7166a6087f2ccbce289774caddc790583e241
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