Unhandled SIGILL: An illegal instruction occurred.

edit

Is this a bug?

Definitely yes. Especially with the "No backtrace available" you mention. But since you don't tell us what you were trying to do, it is pretty hard to divine the cause of the problem : in the plotting action, or in computing what you were trying to plot...

You should try to post a documented example (i. e. an actual attempt at plotting something and the complete answer of the system) on sage-support, where a developper might help you better than I can with so few details. (S)he might also be able to help you file a ticket.

I get a similar error, when running the command

plot(x^2+1,(x,-1,1))

inside a terminal session.

For instance:

plot(x^2+1,(x,-1,))

TypeError Traceback (most recent call last) <ipython-input-1-8ef1c67ac85a> in <module>() ----> 1 plot(x**Integer(2)+Integer(1),(x,-Integer(1),))

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/misc/decorators.pyc in wrapper(args, *kwds) 565 options['__original_opts'] = kwds 566 options.update(kwds) --> 567 return func(args, *options) 568 569 #Add the options specified by @options to the signature of the wrapped

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/plot/plot.pyc in plot(funcs, args, *kwds) 1939 1940 if hasattr(funcs, 'plot'): -> 1941 G = funcs.plot(args, *original_opts) 1942 1943 # If we have extra keywords already set, then update them

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.plot (build/cythonized/sage/symbolic/expression.cpp:68738)() 12030 except NotImplementedError: 12031 return self.function(param)

12032 return plot(f, args, *kwds) 12033 12034 def _plot_fast_callable(self, *vars):

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/misc/decorators.pyc in wrapper(args, *kwds) 565 options['__original_opts'] = kwds 566 options.update(kwds) --> 567 return func(args, *options) 568 569 #Add the options specified by @options to the signature of the wrapped

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/plot/plot.pyc in plot(funcs, args, *kwds) 1958 # if there is one extra arg, then it had better be a tuple 1959 elif n == 1: -> 1960 G = _plot(funcs, args, *kwds) 1961 elif n == 2: 1962 # if there are two extra args, then pull them out and pass them as a tuple

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/plot/plot.pyc in _plot(funcs, xrange, parametric, polar, fill, label, randomize, **options) 2075 orig_funcs = funcs # keep the original functions (for use in legend labels) 2076 excluded_points = [] -> 2077 funcs, ranges = setup_for_eval_on_grid(funcs, [xrange], options['plot_points']) 2078 xmin, xmax, delta = ranges[0] 2079 xrange=ranges[0][:2]

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/plot/misc.pyc in setup_for_eval_on_grid(funcs, ranges, plot_points, return_vars) 119 vars += ('_',)*(nargs-len(vars)) 120 --> 121 ranges = [[float(z) for z in r] for r in ranges] 122 123 if plot_points is None:

/Applications/SageMath-8.3.app/Contents/Resources/sage/local/lib/python2.7/site-packages/sage/symbolic/expression.pyx in sage.symbolic.expression.Expression.__float__ (build/cythonized/sage/symbolic/expression.cpp:11836)() 1426 raise 1427 except TypeError: -> 1428 raise TypeError("unable to simplify to float approximation") 1429 return ret 1430

TypeError: unable to simplify to float approximation