The java/lang/StackFrameInfo class declares a field called 'bci' with type short.
The support in the JVM to update this field incorrectly uses a method writing an int:

void java_lang_StackFrameInfo::set_bci(oop element, int value) {
    element->int_field_put(_bci_offset, value);
}

The size of an int being 4 bytes, and the size of a short being 2 bytes, when this method is called, it overwrites the next two bytes after the bci field.

Correct implementation of this method is:

void java_lang_StackFrameInfo::set_bci(oop element, int value) {
    element->short_field_put(_bci_offset, value);
}