Hotspot has intermittent crash on assigning 2-fields value type into array.
Rate of crashes: ~25 crashes from 100 executions.
At the same moment, similar tests with 1-field value class and 8-fields value class did not crash (checked on ~300 executions).
Example of hs_err file is attached.

Code:
    public Object bc_value() {
        ValueI2[] values = new ValueI2[SIZE];
        for (int i = 0, k = 0; i < values.length; i++, k += 2) {
            values[i] = ValueI2.of(k, k + 1);
        }
        return values;
    }

where ValueI2 is:

public __ByValue final class ValueI2 {
    public final int re;
    public final int im;

    public ValueI2() {
        this.re = 0;
        this.im = 0;
    }

    public int re() {
        return re;
    }

    public int im() {
        return im;
    }

    public ValueI2 add(ValueI2 v) {
        return of(this.re() + v.re(), this.im() + v.im());
    }

    public ValueI2 mul(ValueI2 v) {
        int tre = this.re();
        int tim = this.im();
        int vre = v.re();
        int vim = v.im();
        return of(tre * vre - tim*vim, tre*vim + vre*tim);
    }

    __ValueFactory public static ValueI2 of(int re, int im) {
        ValueI2 v = __MakeDefault ValueI2();
        v.re = re;
        v.im = im;
        return v;
    }

How to reproduce:
1. get benchmarks.jar file (attached) or build it from sources (sources are available at http://cr.openjdk.java.net/~skuksenko/valhalla/benchmarks/src.zip )

2. execute:
java -noverify -XX:+EnableMVT -jar benchmarks.jar arrayfill.FillI2.bc_value -f 1

Note: crash doesn't depend on turning tiered compilation on/off