[sage-release] Re: Sage 7.0.beta2 released

2015-12-31 Thread Volker Braun
Looks more like a bug with signals; The preceeding test is too small (or 
the alarm granularity too large)

sage: n = prod(primes_first_n(9))
sage: try:
: alarm(1e-5)
: _ = n._pari_divisors_small()
: except AlarmInterrupt:
: pass

and the alarm is then only raised in the following doctest. This is a 
regression caused by http://trac.sagemath.org/19688

If you don't trust your library linkings you can always run ldd 
local/lib/python/site-packages/sage/rings/integer.so


On Thursday, December 31, 2015 at 7:03:25 PM UTC+1, Steven Trogdon wrote:
>
> I have the following failure:
>
> ./sage -t src/sage/rings/integer.pyx
> too many failed tests, not using stored timings
> Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
> Git branch: develop
> Using --optional=mpir,python2,sage
> Doctesting 1 file.
> sage -t src/sage/rings/integer.pyx
> **
> File "src/sage/rings/integer.pyx", line 2622, in 
> sage.rings.integer.Integer.divisors
> Failed example:
> 6.divisors()
> Exception raised:
> Traceback (most recent call last):
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>  
> line 496, in _run
> self.compile_and_execute(example, compiler, test.globs)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>  
> line 858, in compile_and_execute
> exec(compiled, globs)
>   File "", line 1, in 
> 
> Integer(6).divisors()
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>  
> line 745, in displayhook
> plain_text, rich_output = self._rich_output_formatter(obj, dict())
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>  
> line 610, in _rich_output_formatter
> plain_text = self._backend.plain_text_formatter(obj, 
> **rich_repr_kwds)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>  
> line 305, in plain_text_formatter
> plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>  
> line 250, in _apply_pretty_printer
> printer.pretty(obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
>  
> line 147, in pretty
> ok = representation(obj, self, cycle)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
>  
> line 157, in __call__
> pretty_repr(obj, p, cycle)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>  
> line 550, in inner
> p.text(',')
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>  
> line 211, in text
> self.output.write(obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python/StringIO.py", 
> line 213, in write
> _complain_ifclosed(self.closed)
>   File "sage/ext/interrupt/interrupt.pyx", line 204, in 
> sage.ext.interrupt.interrupt.sage_python_check_interrupt 
> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:1904)
> sig_check()
>   File "sage/ext/interrupt/interrupt.pyx", line 91, in 
> sage.ext.interrupt.interrupt.sig_raise_exception 
> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:970)
> raise AlarmInterrupt
> AlarmInterrupt
> **
> 1 item had failures:
>1 of  21 in sage.rings.integer.Integer.divisors
> [1055 tests, 1 failure, 11.65 s]
> --
> sage -t src/sage/rings/integer.pyx  # 1 doctest failed
> --
> Total time for all tests: 12.2 seconds
> cpu time: 5.2 seconds
> cumulative wall time: 11.6 seconds
>
> The failure is not always the same. Sometimes the failed example is 
> '6.divisors()' and sometimes it's '28.divisors()`. And on other tries 
> something else fails in a quite nasty fashion.
>
>

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[sage-release] Re: Sage 7.0.beta2 released

2015-12-31 Thread Steven Trogdon
linking looks good:

(sage-sh) strogdon@ledaig:/64bitdev/storage/sage-git_develop/sage$ ldd -r 
local/lib/python/site-packages/sage/rings/integer.so 
linux-vdso.so.1 (0x7fffdd18d000)
libntl.so.19 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libntl.so.19 
(0x7f1a0d92c000)
libpari-gmp-2.8.so.0 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libpari-gmp-2.8.so.0 
(0x7f1a0cf8f000)
libflint.so.13 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libflint.so.13 
(0x7f1a0c8c1000)
libgmp.so.16 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libgmp.so.16 
(0x7f1a0c64c000)
libpython2.7.so.1.0 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libpython2.7.so.1.0 
(0x7f1a0c23f000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x7f1a0bfe2000)
libc.so.6 => /lib64/libc.so.6 (0x7f1a0bc45000)
libgf2x.so.1 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libgf2x.so.1 
(0x7f1a0ba2c000)
libstdc++.so.6 => /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libstdc++.so.6 
(0x7f1a0b71e000)
libm.so.6 => /lib64/libm.so.6 (0x7f1a0b41d000)
libgcc_s.so.1 => /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libgcc_s.so.1 
(0x7f1a0b205000)
libdl.so.2 => /lib64/libdl.so.2 (0x7f1a0b001000)
libmpfr.so.4 => 
/64bitdev/storage/sage-git_develop/sage/local/lib/libmpfr.so.4 
(0x7f1a0ada3000)
/lib64/ld-linux-x86-64.so.2 (0x7f1a0dfe6000)
libutil.so.1 => /lib64/libutil.so.1 (0x7f1a0aba)


On Thursday, December 31, 2015 at 1:00:53 PM UTC-6, Volker Braun wrote:
>
> Looks more like a bug with signals; The preceeding test is too small (or 
> the alarm granularity too large)
>
> sage: n = prod(primes_first_n(9))
> sage: try:
> : alarm(1e-5)
> : _ = n._pari_divisors_small()
> : except AlarmInterrupt:
> : pass
>
> and the alarm is then only raised in the following doctest. This is a 
> regression caused by http://trac.sagemath.org/19688
>
> If you don't trust your library linkings you can always run ldd 
> local/lib/python/site-packages/sage/rings/integer.so
>
>
> On Thursday, December 31, 2015 at 7:03:25 PM UTC+1, Steven Trogdon wrote:
>>
>> I have the following failure:
>>
>> ./sage -t src/sage/rings/integer.pyx
>> too many failed tests, not using stored timings
>> Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
>> Git branch: develop
>> Using --optional=mpir,python2,sage
>> Doctesting 1 file.
>> sage -t src/sage/rings/integer.pyx
>> **
>> File "src/sage/rings/integer.pyx", line 2622, in 
>> sage.rings.integer.Integer.divisors
>> Failed example:
>> 6.divisors()
>> Exception raised:
>> Traceback (most recent call last):
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>>  
>> line 496, in _run
>> self.compile_and_execute(example, compiler, test.globs)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>>  
>> line 858, in compile_and_execute
>> exec(compiled, globs)
>>   File "", line 1, in 
>> 
>> Integer(6).divisors()
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>>  
>> line 745, in displayhook
>> plain_text, rich_output = self._rich_output_formatter(obj, dict())
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>>  
>> line 610, in _rich_output_formatter
>> plain_text = self._backend.plain_text_formatter(obj, 
>> **rich_repr_kwds)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>>  
>> line 305, in plain_text_formatter
>> plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>>  
>> line 250, in _apply_pretty_printer
>> printer.pretty(obj)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
>>  
>> line 147, in pretty
>> ok = representation(obj, self, cycle)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
>>  
>> line 157, in __call__
>> pretty_repr(obj, p, cycle)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>>  
>> line 550, in inner
>> p.text(',')
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>>  
>> line 211, in text
>> self.output.write(obj)
>>   File 
>> 

[sage-release] Re: Sage 7.0.beta2 released

2015-12-31 Thread Steven Trogdon
Is it possible that a system component is contaminating the doctest? I get 
a similar failure from a sage-on-gentoo install where the failure seems to 
point to gmp?

On Thursday, December 31, 2015 at 12:03:25 PM UTC-6, Steven Trogdon wrote:
>
> I have the following failure:
>
> ./sage -t src/sage/rings/integer.pyx
> too many failed tests, not using stored timings
> Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
> Git branch: develop
> Using --optional=mpir,python2,sage
> Doctesting 1 file.
> sage -t src/sage/rings/integer.pyx
> **
> File "src/sage/rings/integer.pyx", line 2622, in 
> sage.rings.integer.Integer.divisors
> Failed example:
> 6.divisors()
> Exception raised:
> Traceback (most recent call last):
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>  
> line 496, in _run
> self.compile_and_execute(example, compiler, test.globs)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>  
> line 858, in compile_and_execute
> exec(compiled, globs)
>   File "", line 1, in 
> 
> Integer(6).divisors()
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>  
> line 745, in displayhook
> plain_text, rich_output = self._rich_output_formatter(obj, dict())
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>  
> line 610, in _rich_output_formatter
> plain_text = self._backend.plain_text_formatter(obj, 
> **rich_repr_kwds)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>  
> line 305, in plain_text_formatter
> plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>  
> line 250, in _apply_pretty_printer
> printer.pretty(obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
>  
> line 147, in pretty
> ok = representation(obj, self, cycle)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
>  
> line 157, in __call__
> pretty_repr(obj, p, cycle)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>  
> line 550, in inner
> p.text(',')
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>  
> line 211, in text
> self.output.write(obj)
>   File 
> "/64bitdev/storage/sage-git_develop/sage/local/lib/python/StringIO.py", 
> line 213, in write
> _complain_ifclosed(self.closed)
>   File "sage/ext/interrupt/interrupt.pyx", line 204, in 
> sage.ext.interrupt.interrupt.sage_python_check_interrupt 
> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:1904)
> sig_check()
>   File "sage/ext/interrupt/interrupt.pyx", line 91, in 
> sage.ext.interrupt.interrupt.sig_raise_exception 
> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:970)
> raise AlarmInterrupt
> AlarmInterrupt
> **
> 1 item had failures:
>1 of  21 in sage.rings.integer.Integer.divisors
> [1055 tests, 1 failure, 11.65 s]
> --
> sage -t src/sage/rings/integer.pyx  # 1 doctest failed
> --
> Total time for all tests: 12.2 seconds
> cpu time: 5.2 seconds
> cumulative wall time: 11.6 seconds
>
> The failure is not always the same. Sometimes the failed example is 
> '6.divisors()' and sometimes it's '28.divisors()`. And on other tries 
> something else fails in a quite nasty fashion.
>
>

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[sage-release] Re: Sage 7.0.beta2 released

2015-12-31 Thread Steven Trogdon
I have the following failure:

./sage -t src/sage/rings/integer.pyx
too many failed tests, not using stored timings
Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
Git branch: develop
Using --optional=mpir,python2,sage
Doctesting 1 file.
sage -t src/sage/rings/integer.pyx
**
File "src/sage/rings/integer.pyx", line 2622, in 
sage.rings.integer.Integer.divisors
Failed example:
6.divisors()
Exception raised:
Traceback (most recent call last):
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 496, in _run
self.compile_and_execute(example, compiler, test.globs)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
 
line 858, in compile_and_execute
exec(compiled, globs)
  File "", line 1, in 

Integer(6).divisors()
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
 
line 745, in displayhook
plain_text, rich_output = self._rich_output_formatter(obj, dict())
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
 
line 610, in _rich_output_formatter
plain_text = self._backend.plain_text_formatter(obj, 
**rich_repr_kwds)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
 
line 305, in plain_text_formatter
plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
 
line 250, in _apply_pretty_printer
printer.pretty(obj)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
 
line 147, in pretty
ok = representation(obj, self, cycle)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
 
line 157, in __call__
pretty_repr(obj, p, cycle)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
 
line 550, in inner
p.text(',')
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
 
line 211, in text
self.output.write(obj)
  File 
"/64bitdev/storage/sage-git_develop/sage/local/lib/python/StringIO.py", 
line 213, in write
_complain_ifclosed(self.closed)
  File "sage/ext/interrupt/interrupt.pyx", line 204, in 
sage.ext.interrupt.interrupt.sage_python_check_interrupt 
(/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:1904)
sig_check()
  File "sage/ext/interrupt/interrupt.pyx", line 91, in 
sage.ext.interrupt.interrupt.sig_raise_exception 
(/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:970)
raise AlarmInterrupt
AlarmInterrupt
**
1 item had failures:
   1 of  21 in sage.rings.integer.Integer.divisors
[1055 tests, 1 failure, 11.65 s]
--
sage -t src/sage/rings/integer.pyx  # 1 doctest failed
--
Total time for all tests: 12.2 seconds
cpu time: 5.2 seconds
cumulative wall time: 11.6 seconds

The failure is not always the same. Sometimes the failed example is 
'6.divisors()' and sometimes it's '28.divisors()`. And on other tries 
something else fails in a quite nasty fashion.

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[sage-release] Re: Sage 7.0.beta2 released

2015-12-31 Thread Volker Braun
This is now http://trac.sagemath.org/ticket/19816

On Thursday, December 31, 2015 at 8:00:53 PM UTC+1, Volker Braun wrote:
>
> Looks more like a bug with signals; The preceeding test is too small (or 
> the alarm granularity too large)
>
> sage: n = prod(primes_first_n(9))
> sage: try:
> : alarm(1e-5)
> : _ = n._pari_divisors_small()
> : except AlarmInterrupt:
> : pass
>
> and the alarm is then only raised in the following doctest. This is a 
> regression caused by http://trac.sagemath.org/19688
>
> If you don't trust your library linkings you can always run ldd 
> local/lib/python/site-packages/sage/rings/integer.so
>
>
> On Thursday, December 31, 2015 at 7:03:25 PM UTC+1, Steven Trogdon wrote:
>>
>> I have the following failure:
>>
>> ./sage -t src/sage/rings/integer.pyx
>> too many failed tests, not using stored timings
>> Running doctests with ID 2015-12-31-11-59-48-9f43f0a3.
>> Git branch: develop
>> Using --optional=mpir,python2,sage
>> Doctesting 1 file.
>> sage -t src/sage/rings/integer.pyx
>> **
>> File "src/sage/rings/integer.pyx", line 2622, in 
>> sage.rings.integer.Integer.divisors
>> Failed example:
>> 6.divisors()
>> Exception raised:
>> Traceback (most recent call last):
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>>  
>> line 496, in _run
>> self.compile_and_execute(example, compiler, test.globs)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/doctest/forker.py",
>>  
>> line 858, in compile_and_execute
>> exec(compiled, globs)
>>   File "", line 1, in 
>> 
>> Integer(6).divisors()
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>>  
>> line 745, in displayhook
>> plain_text, rich_output = self._rich_output_formatter(obj, dict())
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/display_manager.py",
>>  
>> line 610, in _rich_output_formatter
>> plain_text = self._backend.plain_text_formatter(obj, 
>> **rich_repr_kwds)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>>  
>> line 305, in plain_text_formatter
>> plain_text = self._apply_pretty_printer(SagePrettyPrinter, obj)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/rich_output/backend_base.py",
>>  
>> line 250, in _apply_pretty_printer
>> printer.pretty(obj)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/pretty_print.py",
>>  
>> line 147, in pretty
>> ok = representation(obj, self, cycle)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/sage/repl/display/fancy_repr.py",
>>  
>> line 157, in __call__
>> pretty_repr(obj, p, cycle)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>>  
>> line 550, in inner
>> p.text(',')
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python2.7/site-packages/IPython/lib/pretty.py",
>>  
>> line 211, in text
>> self.output.write(obj)
>>   File 
>> "/64bitdev/storage/sage-git_develop/sage/local/lib/python/StringIO.py", 
>> line 213, in write
>> _complain_ifclosed(self.closed)
>>   File "sage/ext/interrupt/interrupt.pyx", line 204, in 
>> sage.ext.interrupt.interrupt.sage_python_check_interrupt 
>> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:1904)
>> sig_check()
>>   File "sage/ext/interrupt/interrupt.pyx", line 91, in 
>> sage.ext.interrupt.interrupt.sig_raise_exception 
>> (/64bitdev/storage/sage-git_develop/sage/src/build/cythonized/sage/ext/interrupt/interrupt.c:970)
>> raise AlarmInterrupt
>> AlarmInterrupt
>> **
>> 1 item had failures:
>>1 of  21 in sage.rings.integer.Integer.divisors
>> [1055 tests, 1 failure, 11.65 s]
>> --
>> sage -t src/sage/rings/integer.pyx  # 1 doctest failed
>> --
>> Total time for all tests: 12.2 seconds
>> cpu time: 5.2 seconds
>> cumulative wall time: 11.6 seconds
>>
>> The failure is not always the same. Sometimes the failed example is 
>> '6.divisors()' and sometimes it's '28.divisors()`. And on other tries 
>> something else fails in a quite nasty fashion.
>>
>>

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