A strange problem.

[GerrieWell]

LinkedList<int> mMagBiasX = LinkedList<int>();
void magcalMPU9250_2() {
	int sample_count;
	Serial.println("Mag Calibration ");
	mMagBiasX.clear();
	for(;;){

//		Serial.println(mag_temp[0]);
		int t = 0;
		//memcpy(&t,&mag_temp[0],sizeof(int16_t));		#2
		t = -1;	//t =mag_temp[0];                                          #1
		mMagBiasX.add(t);
// 		delay(135);  // at 8 Hz ODR, new mag data is available every 125 ms
		delay(16);
 		//if(calibBut.uniquePress())
 		//	break;
 		Serial.println(sample_count);
 		Serial.println(mMagBiasX.size());
 	}
}

Just copy this function to SimpleIntegerList.pde . and call it from setup .Then the loop will stuck at about the 176th call (Arduino uno).
and comment # 1 line out ,u will see the loop work again . I don't know why .Maybe relative to the memory ,so maybe it is arduino false . I don't know and give up .Just hope you notice this.

[ivanseidel]

Closing, since a few improvements have been made.