Overflowed constant

The overflowed value due to arithmetic on constants is too small or unexpectedly negative, causing incorrect computations. Integer overflow occurs in arithmetic on constant operands
/src/mongo/db/storage/key_string.cpp:938: INTEGER_OVERFLOW 151472 Expression "0xffffffffffffffffUL << fractionalBits", which is equal to 18437736874454810624, where "fractionalBits" is known to be equal to 53, overflows the type that receives it, an unsigned integer 64 bits wide.