On Friday, August 17, 2018 at 1:48:30 AM UTC+3, Laurent Bakri wrote:
>
> Hi all,
> as indicated in the crash message, I email you the crash report.
>
we need to know how you installed Sage, and something about your OS (what
Linux distribution and what
version it is).
>
> Cheers,
> ***************************************************************************
>
> IPython post-mortem report
>
> {'commit_hash': u'b467d487e',
> 'commit_source': 'installation',
> 'default_encoding': 'UTF-8',
> 'ipython_path': '/usr/lib/python2.7/dist-packages/IPython',
> 'ipython_version': '5.5.0',
> 'os_name': 'posix',
> 'platform': 'Linux-4.17.0-1-amd64-x86_64-with-debian-buster-sid',
> 'sys_executable': '/usr/bin/python',
> 'sys_platform': 'linux2',
> 'sys_version': '2.7.15 (default, Jul 28 2018, 11:29:29) \n[GCC 8.1.0]'}
>
> ***************************************************************************
>
>
>
> ***************************************************************************
>
> Crash traceback:
>
> ---------------------------------------------------------------------------
> ---------------------------------------------------------------------------
> SignalError Python 2.7.15: /usr/bin/python
> Fri Aug 17 00:43:20 2018
> A problem occurred executing Python code. Here is the sequence of function
> calls leading up to the error, with the most recent (innermost) call last.
> /usr/share/sagemath/bin/sage-ipython in <module>()
> 1 #!/usr/bin/env python
> 2 # -*- coding: utf-8 -*-
> 3 """
> 4 Sage IPython startup script.
> 5 """
> 6
> 7 from sage.repl.interpreter import SageTerminalApp
> 8
> 9 app = SageTerminalApp.instance()
> ---> 10 app.initialize()
> global app.initialize = <bound method SageTerminalApp.initialize
> of <sage.repl.interpreter.SageTerminalApp object at 0x7f0bc1b41310>>
> 11 app.start()
>
> <decorator-gen-110> in
> initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
>
> /usr/lib/python2.7/dist-packages/traitlets/config/application.pyc in
> catch_config_error(method=<function initialize>,
> app=<sage.repl.interpreter.SageTerminalApp object>, *args=(None,),
> **kwargs={})
> 72 TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR = False
> 73 else:
> 74 raise ValueError("Unsupported value for environment variable:
> 'TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR' is set to '%s' which is
> none of {'0', '1', 'false', 'true', ''}."% _envvar )
> 75
> 76
> 77 @decorator
> 78 def catch_config_error(method, app, *args, **kwargs):
> 79 """Method decorator for catching invalid config
> (Trait/ArgumentErrors) during init.
> 80
> 81 On a TraitError (generally caused by bad config), this will
> print the trait's
> 82 message, and exit the app.
> 83
> 84 For use on init methods, to prevent invoking excepthook on
> invalid input.
> 85 """
> 86 try:
> ---> 87 return method(app, *args, **kwargs)
> method = <function initialize at 0x7f0bbfe81de8>
> app = <sage.repl.interpreter.SageTerminalApp object at
> 0x7f0bc1b41310>
> args = (None,)
> kwargs = {}
> 88 except (TraitError, ArgumentError) as e:
> 89 app.print_help()
> 90 app.log.fatal("Bad config encountered during
> initialization:")
> 91 app.log.fatal(str(e))
> 92 app.log.debug("Config at the time: %s", app.config)
> 93 app.exit(1)
> 94
> 95
> 96 class ApplicationError(Exception):
> 97 pass
> 98
> 99
> 100 class LevelFormatter(logging.Formatter):
> 101 """Formatter with additional `highlevel` record
> 102
>
> /usr/lib/python2.7/dist-packages/IPython/terminal/ipapp.pyc in
> initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
> 301
> 302 return super(TerminalIPythonApp,
> self).parse_command_line(argv)
> 303
> 304 @catch_config_error
> 305 def initialize(self, argv=None):
> 306 """Do actions after construct, but before starting the
> app."""
> 307 super(TerminalIPythonApp, self).initialize(argv)
> 308 if self.subapp is not None:
> 309 # don't bother initializing further, starting subapp
> 310 return
> 311 # print self.extra_args
> 312 if self.extra_args and not self.something_to_run:
> 313 self.file_to_run = self.extra_args[0]
> 314 self.init_path()
> 315 # create the shell
> --> 316 self.init_shell()
> self.init_shell = <bound method SageTerminalApp.init_shell of
> <sage.repl.interpreter.SageTerminalApp object at 0x7f0bc1b41310>>
> 317 # and draw the banner
> 318 self.init_banner()
> 319 # Now a variety of things that happen after the banner is
> printed.
> 320 self.init_gui_pylab()
> 321 self.init_extensions()
> 322 self.init_code()
> 323
> 324 def init_shell(self):
> 325 """initialize the InteractiveShell instance"""
> 326 # Create an InteractiveShell instance.
> 327 # shell.display_banner should always be False for the
> terminal
> 328 # based app, because we call shell.show_banner() by hand
> below
> 329 # so the banner shows *before* all extension loading stuff.
> 330 self.shell =
> self.interactive_shell_class.instance(parent=self,
> 331 profile_dir=self.profile_dir,
>
> /usr/lib/python2.7/dist-packages/sage/repl/interpreter.pyc in
> init_shell(self=<sage.repl.interpreter.SageTerminalApp object>)
> 747 self.shell.has_sage_extensions = SAGE_EXTENSION in
> self.extensions
> 748
> 749 # Load the %lprun extension if available
> 750 try:
> 751 import line_profiler
> 752 except ImportError:
> 753 pass
> 754 else:
> 755 self.extensions.append('line_profiler')
> 756
> 757 if self.shell.has_sage_extensions:
> 758 self.extensions.remove(SAGE_EXTENSION)
> 759
> 760 # load sage extension here to get a crash if
> 761 # something is wrong with the sage library
> --> 762
> self.shell.extension_manager.load_extension(SAGE_EXTENSION)
> self.shell.extension_manager.load_extension = <bound method
> ExtensionManager.load_extension of
> <IPython.core.extensions.ExtensionManager object at 0x7f0bc1a85590>>
> global SAGE_EXTENSION = 'sage'
> 763
> 764
>
> /usr/lib/python2.7/dist-packages/IPython/core/extensions.pyc in
> load_extension(self=<IPython.core.extensions.ExtensionManager object>,
> module_str='sage')
> 70
> 71 Returns the string "already loaded" if the extension is
> already loaded,
> 72 "no load function" if the module doesn't have a
> load_ipython_extension
> 73 function, or None if it succeeded.
> 74 """
> 75 if module_str in self.loaded:
> 76 return "already loaded"
> 77
> 78 from IPython.utils.syspathcontext import
> prepended_to_syspath
> 79
> 80 with self.shell.builtin_trap:
> 81 if module_str not in sys.modules:
> 82 with
> prepended_to_syspath(self.ipython_extension_dir):
> 83 __import__(module_str)
> 84 mod = sys.modules[module_str]
> ---> 85 if self._call_load_ipython_extension(mod):
> self._call_load_ipython_extension = <bound method
> ExtensionManager._call_load_ipython_extension of
> <IPython.core.extensions.ExtensionManager object at 0x7f0bc1a85590>>
> mod = <module 'sage' from
> '/usr/lib/python2.7/dist-packages/sage/__init__.pyc'>
> 86 self.loaded.add(module_str)
> 87 else:
> 88 return "no load function"
> 89
> 90 def unload_extension(self, module_str):
> 91 """Unload an IPython extension by its module name.
> 92
> 93 This function looks up the extension's name in
> ``sys.modules`` and
> 94 simply calls ``mod.unload_ipython_extension(self)``.
> 95
> 96 Returns the string "no unload function" if the extension
> doesn't define
> 97 a function to unload itself, "not loaded" if the extension
> isn't loaded,
> 98 otherwise None.
> 99 """
> 100 if module_str not in self.loaded:
>
> /usr/lib/python2.7/dist-packages/IPython/core/extensions.pyc in
> _call_load_ipython_extension(self=<IPython.core.extensions.ExtensionManager
> object>, mod=<module 'sage' from
> '/usr/lib/python2.7/dist-packages/sage/__init__.pyc'>)
> 117 """
> 118 from IPython.utils.syspathcontext import
> prepended_to_syspath
> 119
> 120 if (module_str in self.loaded) and (module_str in
> sys.modules):
> 121 self.unload_extension(module_str)
> 122 mod = sys.modules[module_str]
> 123 with prepended_to_syspath(self.ipython_extension_dir):
> 124 reload(mod)
> 125 if self._call_load_ipython_extension(mod):
> 126 self.loaded.add(module_str)
> 127 else:
> 128 self.load_extension(module_str)
> 129
> 130 def _call_load_ipython_extension(self, mod):
> 131 if hasattr(mod, 'load_ipython_extension'):
> --> 132 mod.load_ipython_extension(self.shell)
> mod.load_ipython_extension = <function load_ipython_extension at
> 0x7f0bc1d626e0>
> self.shell = <sage.repl.interpreter.SageTerminalInteractiveShell
> object at 0x7f0bbfedda10>
> 133 return True
> 134
> 135 def _call_unload_ipython_extension(self, mod):
> 136 if hasattr(mod, 'unload_ipython_extension'):
> 137 mod.unload_ipython_extension(self.shell)
> 138 return True
> 139
> 140 def install_extension(self, url, filename=None):
> 141 """Download and install an IPython extension.
> 142
> 143 If filename is given, the file will be so named (inside
> the extension
> 144 directory). Otherwise, the name from the URL will be used.
> The file must
> 145 have a .py or .zip extension; otherwise, a ValueError will
> be raised.
> 146
> 147 Returns the full path to the installed file.
>
> /usr/lib/python2.7/dist-packages/sage/__init__.pyc in
> load_ipython_extension(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell
>
> object>,))
> 1 __all__ = ['all']
> 2
> 3 # Make sure that the correct zlib library is loaded. This is needed
> 4 # to prevent the system zlib to be loaded instead of the Sage one.
> 5 # See https://trac.sagemath.org/ticket/23122
> 6 import zlib
> 7
> 8 # IPython calls this when starting up
> 9 def load_ipython_extension(*args):
> 10 import sage.repl.ipython_extension
> ---> 11 sage.repl.ipython_extension.load_ipython_extension(*args)
> sage.repl.ipython_extension.load_ipython_extension = <function
> load_ipython_extension at 0x7f0bbea62938>
> args = (<sage.repl.interpreter.SageTerminalInteractiveShell object
> at 0x7f0bbfedda10>,)
> 12
> 13
> 14 # Monkey-patch inspect.isfunction() to support Cython functions.
> 15 def isfunction(obj):
> 16 """
> 17 Check whether something is a function.
> 18
> 19 We assume that anything which has a genuine ``__code__``
> 20 attribute (not using ``__getattr__`` overrides) is a function.
> 21 This is meant to support Cython functions.
> 22
> 23 EXAMPLES::
> 24
> 25 sage: from inspect import isfunction
> 26 sage: def f(): pass
> 27 sage: isfunction(f)
> 28 True
> 29 sage: isfunction(lambda x:x)
> 30 True
> 31 sage: from sage.categories.coercion_methods import
> _mul_parent
>
> /usr/lib/python2.7/dist-packages/sage/repl/ipython_extension.pyc in
> wrapper(*args=(<sage.repl.interpreter.SageTerminalInteractiveShell
> object>,), **kwargs={})
> 546 ....: if work:
> 547 ....: return 'foo worked'
> 548 ....: raise RuntimeError("foo didn't work")
> 549 sage: foo(False)
> 550 Traceback (most recent call last):
> 551 ...
> 552 RuntimeError: foo didn't work
> 553 sage: foo(True)
> 554 'foo worked'
> 555 sage: foo(False)
> 556 sage: foo(True)
> 557 """
> 558 @wraps(func)
> 559 def wrapper(*args, **kwargs):
> 560 if not wrapper.has_run:
> --> 561 result = func(*args, **kwargs)
> result = undefined
> global func = undefined
> args = (<sage.repl.interpreter.SageTerminalInteractiveShell object
> at 0x7f0bbfedda10>,)
> kwargs = {}
> 562 wrapper.has_run = True
> 563 return result
> 564 wrapper.has_run = False
> 565 return wrapper
> 566
> 567
> 568 @run_once
> 569 def load_ipython_extension(ip):
> 570 """
> 571 Load the extension in IPython.
> 572 """
> 573 # this modifies ip
> 574 SageCustomizations(shell=ip)
>
> /usr/lib/python2.7/dist-packages/sage/repl/ipython_extension.pyc in
> load_ipython_extension(ip=<sage.repl.interpreter.SageTerminalInteractiveShell
> object>)
> 559 def wrapper(*args, **kwargs):
> 560 if not wrapper.has_run:
> 561 result = func(*args, **kwargs)
> 562 wrapper.has_run = True
> 563 return result
> 564 wrapper.has_run = False
> 565 return wrapper
> 566
> 567
> 568 @run_once
> 569 def load_ipython_extension(ip):
> 570 """
> 571 Load the extension in IPython.
> 572 """
> 573 # this modifies ip
> --> 574 SageCustomizations(shell=ip)
> global SageCustomizations = <class
> 'sage.repl.ipython_extension.SageCustomizations'>
> global shell = undefined
> ip = <sage.repl.interpreter.SageTerminalInteractiveShell object at
> 0x7f0bbfedda10>
>
> /usr/lib/python2.7/dist-packages/sage/repl/ipython_extension.pyc in
> __init__(self=<sage.repl.ipython_extension.SageCustomizations object>,
> shell=<sage.repl.interpreter.SageTerminalInteractiveShell object>)
> 417 def __init__(self, shell=None):
> 418 """
> 419 Initialize the Sage plugin.
> 420 """
> 421 self.shell = shell
> 422
> 423 self.auto_magics = SageMagics(shell)
> 424 self.shell.register_magics(self.auto_magics)
> 425
> 426 import sage.misc.edit_module as edit_module
> 427 self.shell.set_hook('editor', edit_module.edit_devel)
> 428
> 429 self.init_inspector()
> 430 self.init_line_transforms()
> 431
> --> 432 import sage.all # until sage's import hell is fixed
> sage.all = undefined
> 433
> 434 self.shell.verbose_quit = True
> 435 self.set_quit_hook()
> 436
> 437 self.register_interface_magics()
> 438
> 439 if SAGE_IMPORTALL == 'yes':
> 440 self.init_environment()
> 441
> 442 def register_interface_magics(self):
> 443 """
> 444 Register magics for each of the Sage interfaces
> 445 """
> 446 from sage.repl.interface_magic import InterfaceMagic
> 447 InterfaceMagic.register_all(self.shell)
>
> /usr/lib/python2.7/dist-packages/sage/all.py in <module>()
> 87 from sage.misc.all import * # takes a while
> 88 from sage.typeset.all import *
> 89 from sage.repl.all import *
> 90
> 91 from sage.misc.sh import sh
> 92
> 93 from sage.libs.all import *
> 94 from sage.data_structures.all import *
> 95 from sage.doctest.all import *
> 96
> 97 from sage.structure.all import *
> 98 from sage.rings.all import *
> 99 from sage.arith.all import *
> 100 from sage.matrix.all import *
> 101
> --> 102 from sage.symbolic.all import *
> global sage.symbolic.all = undefined
> 103 from sage.modules.all import *
> 104 from sage.monoids.all import *
> 105 from sage.algebras.all import *
> 106 from sage.modular.all import *
> 107 from sage.sat.all import *
> 108 from sage.schemes.all import *
> 109 from sage.graphs.all import *
> 110 from sage.groups.all import *
> 111 from sage.databases.all import *
> 112 from sage.categories.all import *
> 113 from sage.sets.all import *
> 114 from sage.probability.all import *
> 115 from sage.interfaces.all import *
> 116
> 117 from sage.functions.all import *
>
> /usr/lib/python2.7/dist-packages/sage/symbolic/all.py in <module>()
> 1 from __future__ import absolute_import
> 2
> ----> 3 from sage.libs.pynac.pynac import I
> global sage.libs.pynac.pynac = undefined
> global I = undefined
> 4 i = I
> 5
> 6 from .ring import SR
> 7 from .constants import (pi, e, NaN, golden_ratio, log2,
> euler_gamma, catalan,
> 8 khinchin, twinprime, mertens, glaisher)
> 9 from .expression import Expression, solve_diophantine, hold
> 10 from .callable import CallableSymbolicExpressionRing
> 11
> 12 from sage.symbolic.relation import solve, solve_mod, solve_ineq
> 13 from sage.symbolic.assumptions import assume, forget, assumptions,
> assuming
> 14
> 15 from .units import units
>
> sage/libs/pynac/pynac.pyx in init sage.libs.pynac.pynac()
>
> sage/libs/pynac/pynac.pyx in sage.libs.pynac.pynac.init_pynac_I
> (build/cythonized/sage/libs/pynac/pynac.cpp:28269)()
>
> /usr/lib/python2.7/dist-packages/sage/rings/number_field/number_field.pyc
> in QuadraticField(D=-1, name='I', check=True, embedding=1.00000000000000*I,
> latex_name='i', **args={})
> 912 False
> 913 """
> 914 D = QQ(D)
> 915 if check:
> 916 if D.is_square():
> 917 raise ValueError("D must not be a perfect square.")
> 918 R = QQ['x']
> 919 f = R([-D, 0, 1])
> 920 if embedding is True:
> 921 if D > 0:
> 922 embedding = RLF(D).sqrt()
> 923 else:
> 924 embedding = CLF(D).sqrt()
> 925 if latex_name == 'sqrt':
> 926 latex_name = r'\sqrt{%s}' % D
> --> 927 return NumberField(f, name, check=False, embedding=embedding,
> latex_name=latex_name, **args)
> global NumberField = <function NumberField at 0x7f0afabd75f0>
> f = x^2 + 1
> name = 'I'
> check = True
> global False = undefined
> embedding = 1.00000000000000*I
> latex_name = 'i'
> args = {}
> 928
> 929 def is_AbsoluteNumberField(x):
> 930 """
> 931 Return True if x is an absolute number field.
> 932
> 933 EXAMPLES::
> 934
> 935 sage: from sage.rings.number_field.number_field import
> is_AbsoluteNumberField
> 936 sage: is_AbsoluteNumberField(NumberField(x^2+1,'a'))
> 937 True
> 938 sage: is_AbsoluteNumberField(NumberField([x^3 + 17,
> x^2+1],'a'))
> 939 False
> 940
> 941 The rationals are a number field, but they're not of the
> absolute
> 942 number field class.
>
> /usr/lib/python2.7/dist-packages/sage/rings/number_field/number_field.pyc
> in NumberField(polynomial=x^2 + 1, name='I', check=False, names=None,
> embedding=1.00000000000000*I, latex_name='i', assume_disc_small=False,
> maximize_at_primes=None, structure=None)
> 514 (2,)
> 515
> 516 It is an error not to specify the generator::
> 517
> 518 sage: K = NumberField(x^2-2)
> 519 Traceback (most recent call last):
> 520 ...
> 521 TypeError: You must specify the name of the generator.
> 522
> 523 """
> 524 if names is not None:
> 525 name = names
> 526 if isinstance(polynomial, (list,tuple)):
> 527 return NumberFieldTower(polynomial, names=name,
> check=check, embeddings=embedding, latex_names=latex_name,
> assume_disc_small=assume_disc_small, maximize_at_primes=maximize_at_primes,
> structures=structure)
> 528
> --> 529 return NumberField_version2(polynomial=polynomial, name=name,
> check=check, embedding=embedding, latex_name=latex_name,
> assume_disc_small=assume_disc_small, maximize_at_primes=maximize_at_primes,
> structure=structure)
> global NumberField_version2 = <class
> 'sage.rings.number_field.number_field.NumberFieldFactory'>
> polynomial = x^2 + 1
> name = 'I'
> check = False
> embedding = 1.00000000000000*I
> latex_name = 'i'
> assume_disc_small = False
> maximize_at_primes = None
> structure = None
> 530
> 531 class NumberFieldFactory(UniqueFactory):
> 532 r"""
> 533 Factory for number fields.
> 534
> 535 This should usually not be called directly, use
> :meth:`NumberField`
> 536 instead.
> 537
> 538 INPUT:
> 539
> 540 - ``polynomial`` - a polynomial over `\QQ` or a number
> field.
> 541 - ``name`` - a string (default: ``'a'``), the name of the
> generator
> 542 - ``check`` - a boolean (default: ``True``); do type
> checking and
> 543 irreducibility checking.
> 544 - ``embedding`` - ``None`` or an element, the images of
> the generator
>
> sage/structure/factory.pyx in
> sage.structure.factory.UniqueFactory.__call__
> (build/cythonized/sage/structure/factory.c:1894)()
>
> sage/structure/factory.pyx in
> sage.structure.factory.UniqueFactory.get_object
> (build/cythonized/sage/structure/factory.c:2083)()
>
> sage/misc/weak_dict.pyx in
> sage.misc.weak_dict.WeakValueDictionary.__getitem__
> (build/cythonized/sage/misc/weak_dict.c:3520)()
>
> sage/cpython/dict_del_by_value.pyx in
> sage.cpython.dict_del_by_value.PyDict_GetItemWithError
> (build/cythonized/sage/cpython/dict_del_by_value.c:1093)()
>
> sage/rings/real_lazy.pyx in sage.rings.real_lazy.LazyFieldElement.__hash__
> (build/cythonized/sage/rings/real_lazy.c:9293)()
>
> sage/rings/real_lazy.pyx in
> sage.rings.real_lazy.LazyFieldElement.__complex__
> (build/cythonized/sage/rings/real_lazy.c:10057)()
>
> sage/rings/real_lazy.pyx in sage.rings.real_lazy.LazyAlgebraic.eval
> (build/cythonized/sage/rings/real_lazy.c:18610)()
>
> sage/rings/real_lazy.pyx in sage.rings.real_lazy.LazyAlgebraic.eval
> (build/cythonized/sage/rings/real_lazy.c:18767)()
>
> sage/rings/polynomial/polynomial_element.pyx in
> sage.rings.polynomial.polynomial_element.Polynomial.roots
> (build/cythonized/sage/rings/polynomial/polynomial_element.c:69593)()
>
> /usr/lib/python2.7/dist-packages/sage/rings/polynomial/complex_roots.pyc
> in complex_roots(p=x^2 + 1, skip_squarefree=False, retval='algebraic',
> min_prec=0)
> 243 if skip_squarefree:
> 244 factors = [(p, 1)]
> 245 else:
> 246 factors = p.squarefree_decomposition()
> 247
> 248 prec = 53
> 249 while True:
> 250 CC = ComplexField(prec)
> 251 CCX = CC['x']
> 252
> 253 all_rts = []
> 254 ok = True
> 255
> 256 for (factor, exp) in factors:
> 257 cfac = CCX(factor)
> --> 258 rts = cfac.roots(multiplicities=False)
> rts = undefined
> cfac.roots = <built-in method roots of
> PolynomialRing_field_with_category.element_class object at 0x7f0aeaaaf360>
> global multiplicities = undefined
> global False = undefined
> 259 # Make sure the number of roots we found is the
> degree. If
> 260 # we don't find that many roots, it's because the
> 261 # precision isn't big enough and though the (possibly
> 262 # exact) polynomial "factor" is squarefree, it is not
> 263 # squarefree as an element of CCX.
> 264 if len(rts) < factor.degree():
> 265 ok = False
> 266 break
> 267 irts = interval_roots(factor, rts, max(prec, min_prec))
> 268 if irts is None:
> 269 ok = False
> 270 break
> 271 if retval != 'interval':
> 272 factor = QQbar.common_polynomial(factor)
> 273 for irt in irts:
>
> sage/rings/polynomial/polynomial_element.pyx in
> sage.rings.polynomial.polynomial_element.Polynomial.roots
> (build/cythonized/sage/rings/polynomial/polynomial_element.c:66301)()
>
> sage/rings/polynomial/polynomial_element.pyx in
> sage.rings.polynomial.polynomial_element.Polynomial.__pari__
> (build/cythonized/sage/rings/polynomial/polynomial_element.c:53869)()
>
> sage/rings/polynomial/polynomial_element.pyx in
> sage.rings.polynomial.polynomial_element.Polynomial._pari_with_name
> (build/cythonized/sage/rings/polynomial/polynomial_element.c:54334)()
>
> sage/rings/complex_number.pyx in
> sage.rings.complex_number.ComplexNumber.__pari__
> (build/cythonized/sage/rings/complex_number.c:7220)()
>
> sage/rings/real_mpfr.pyx in sage.rings.real_mpfr.RealNumber.__pari__
> (build/cythonized/sage/rings/real_mpfr.c:22904)()
>
> SignalError: Segmentation fault
>
> *********************************************************
>
> Laurent.
>
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