ASKSAGE: Sage Q&A Forum - Individual question feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 25 Sep 2018 16:33:24 -0500Unhandled SIGILL: An illegal instruction occurred.https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/I recently installed 8.3 on macos high sierra via pre-built binaries.
I launched a jupyter notebook.
The kernel shuts down when I try to display graphics e.g. when I try to use plot()
Error message:
(no backtrace available)
------------------------------------------------------------------------
Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a *compiled* module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.
Is this a bug?
Sat, 25 Aug 2018 13:40:26 -0500https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/Answer by snicolis for <p>I recently installed 8.3 on macos high sierra via pre-built binaries.
I launched a jupyter notebook.
The kernel shuts down when I try to display graphics e.g. when I try to use plot()
Error message: </p>
<h2>(no backtrace available)</h2>
<p>Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a <em>compiled</em> module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.</p>
<p>Is this a bug? </p>
https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/?answer=43764#post-id-43764I 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
Tue, 25 Sep 2018 16:33:24 -0500https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/?answer=43764#post-id-43764Answer by Emmanuel Charpentier for <p>I recently installed 8.3 on macos high sierra via pre-built binaries.
I launched a jupyter notebook.
The kernel shuts down when I try to display graphics e.g. when I try to use plot()
Error message: </p>
<h2>(no backtrace available)</h2>
<p>Unhandled SIGILL: An illegal instruction occurred.
This probably occurred because a <em>compiled</em> module has a bug
in it and is not properly wrapped with sig_on(), sig_off().
Python will now terminate.</p>
<p>Is this a bug? </p>
https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/?answer=43468#post-id-43468> 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 `plot`ting something and the *complete* answer of the system) on [sage-support](https://groups.google.com/forum/#!forum/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.Sat, 25 Aug 2018 15:27:06 -0500https://ask.sagemath.org/question/43467/unhandled-sigill-an-illegal-instruction-occurred/?answer=43468#post-id-43468