https://issues.dlang.org/show_bug.cgi?id=23978
--- Comment #13 from Iain Buclaw <ibuc...@gdcproject.org> --- >From valgrind. --- ==1582870== Invalid read of size 8 ==1582870== at 0x6A33B5: _D3dmd4root3aav15dmd_aaGetRvalueFNaNbNiPSQBnQBmQBk2AAPvZQd (aav.d:127) ==1582870== by 0x6A36D7: _D3dmd4root3aav__T10AssocArrayTCQBe10identifier10IdentifierTCQCh7dsymbol7DsymbolZQCl7opIndexMFNaNbNixCQDwQCsQCjZQCa (aav.d:313) ==1582870== by 0x512F97: DsymbolTable::lookup(Identifier const*) (dsymbol.d:2408) ==1582870== by 0x510B6D: ScopeDsymbol::search(Loc const&, Identifier*, int) (dsymbol.d:1470) ==1582870== by 0x50D2D7: StructDeclaration::search(Loc const&, Identifier*, int) (dstruct.d:279) ==1582870== by 0x5E8A0A: _D3dmd6opover15search_functionFCQBe7dsymbol12ScopeDsymbolCQCe10identifier10IdentifierZCQDhQCd7Dsymbol (opover.d:1424) ==1582870== by 0x49DC50: _D3dmd5clone19hasIdentityOpEqualsFCQBh9aggregate20AggregateDeclarationPSQCs6dscope5ScopeZCQDk4func15FuncDeclaration (clone.d:462) ==1582870== by 0x49DF98: _D3dmd5clone13buildOpEqualsFCQBb7dstruct17StructDeclarationPSQCh6dscope5ScopeZCQCz4func15FuncDeclaration (clone.d:519) ==1582870== by 0x523A57: DsymbolSemanticVisitor::visit(StructDeclaration*) (dsymbolsem.d:4790) ==1582870== by 0x50D9E1: StructDeclaration::accept(Visitor*) (dstruct.d:502) ==1582870== by 0x514E65: dsymbolSemantic(Dsymbol*, Scope*) (dsymbolsem.d:131) ==1582870== by 0x576A2B: ExpressionSemanticVisitor::visit(DeclarationExp*) (expressionsem.d:5607) ==1582870== Address 0x20ec8348ec8b485d is not stack'd, malloc'd or (recently) free'd --- Prodding this in vgdb --- (gdb) p aa.b $10 = (dmd.root.aav.aaA **) 0x5ebb990 (gdb) monitor who_points_at 0x5ebb990 ==1582870== Searching for pointers to 0x5ebb990 ==1582870== *0x5ef8600 points at 0x5ebb990 Address 0x5ef8600 is in a rw- anonymous segment (gdb) p aa $11 = (dmd.root.aav.AA *) 0x5ef8600 --- There is nobody referencing the base address that was GC.realloc'd but the AA. So blaming xrealloc is the wrong thing here. Next info to retrieve, look at each address between &aa.b[0] .. &aa.b[b_length]. --
