No explanation or solution, but a reduction: import core.memory; void main() { alias T = ubyte;
enum size1 = 2_049; /* > 2_048 = 2^^11 */ enum size2 = 1_048_577; /* > 1_048_576 = 2^^20 */ T* _data; _data = cast(T*)GC.calloc(size1, GC.BlkAttr.NO_MOVE); _data = cast(T*)GC.realloc(_data, size2, GC.BlkAttr.NO_MOVE); T* _pointer = _data; foreach(i; 0 .. size2) { *_pointer = 0; /* segfault at i = 1_048_576 */ _pointer++; } }