#crash.pyx
cdef class PyResult:
    cdef int add
    @property
    def add(self):
        return self.add
    @add.setter
    def mult(self, value): ### here we go, should be add
        self.add = value

>> python --version
Python 2.7.12
>> python -m cython --version 
Cython version 0.27.1
>> python -m cython crash.pyx
Error compiling Cython file:
------------------------------------------------------------
...
    cdef int add
    @property
    def add(self):
        return self.add
    @add.setter
    def mult(self, value):
   ^
------------------------------------------------------------

crash.pyx:7:4: Compiler crash in DecoratorTransform

ModuleNode.body = StatListNode(crash.pyx:1:5)
StatListNode.stats[0] = CClassDefNode(crash.pyx:1:5,
    as_name = u'PyResult',
    class_name = u'PyResult',
    module_name = u'',
    visibility = u'private')
CClassDefNode.body = StatListNode(crash.pyx:2:4)
StatListNode.stats[2] = DefNode(crash.pyx:7:4,
    modifiers = [...]/0,
    name = u'mult',
    num_required_args = 2,
    py_wrapper_required = True,
    reqd_kw_flags_cname = '0')

Compiler crash traceback from this point on:
  File "Cython/Compiler/Visitor.py", line 180, in Cython.Compiler.Visitor.TreeVisitor._visit
    return handler_method(obj)
  File "/usr/local/lib/python2.7/dist-packages/Cython/Compiler/ParseTreeTransforms.py", line 1388, in visit_DefNode
    assert decorator.obj.name == node.name
AssertionError: