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Thanks for the suggestion, Duncan. I recently figured out that it had to do with how I was removing the pseudo instruction in my overridden expandPostRAPseudo() implementation. // member function's signature bool TheInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator p_mi) // works bb.erase(p_mi); // produces the assertion / memory leak. p_mi->removeFromParent(); I should have