#13864: Configure Python with pydebug when SAGE_DEBUG is set
----------------------------------------------------------+-----------------
Reporter: jpflori | Owner:
jason
Type: task | Status:
needs_work
Priority: major | Milestone:
sage-pending
Component: misc | Resolution:
Keywords: python spkg | Work issues:
make sure Sage builds and starts
Report Upstream: N/A | Reviewers:
Volker Braun
Authors: Jean-Pierre Flori | Merged in:
Dependencies: #13865, #13867, #13868, #13876, #13832 | Stopgaps:
----------------------------------------------------------+-----------------
Comment (by SimonKing):
Even better!! The above test yields a reproducible crash on the command
line:
{{{
sage -gdb
...
sage: from sage.tests.benchmark import FiniteExtFieldMult
sage: B = FiniteExtFieldMult(GF(Integer(9), 'x'), Integer(2))
python: Modules/gcmodule.c:326: visit_decref: Assertion `gc->gc.gc_refs !=
0' failed.
Program received signal SIGABRT, Aborted.
0x00007ffff6d95d95 in raise () from /lib64/libc.so.6
(gdb) bt
#0 0x00007ffff6d95d95 in raise () from /lib64/libc.so.6
#1 0x00007ffff6d972ab in abort () from /lib64/libc.so.6
#2 0x00007ffff6d8e8fe in __assert_fail_base () from /lib64/libc.so.6
#3 0x00007ffff6d8e9a2 in __assert_fail () from /lib64/libc.so.6
#4 0x00007ffff7b129c9 in visit_decref (op=0x7fffc1b83a38, data=0x0) at
Modules/gcmodule.c:326
#5 0x00007ffff7a1cbce in dict_traverse (op=0x3017a60,
visit=0x7ffff7b1290e <visit_decref>, arg=0x0) at Objects/dictobject.c:2088
#6 0x00007ffff7b12a3e in subtract_refs (containers=0x7ffff7dc14e0
<generations>) at Modules/gcmodule.c:345
#7 0x00007ffff7b13a73 in collect (generation=0) at Modules/gcmodule.c:874
#8 0x00007ffff7b13d96 in collect_generations () at Modules/gcmodule.c:996
#9 0x00007ffff7b14a4a in _PyObject_GC_Malloc (basicsize=56) at
Modules/gcmodule.c:1457
#10 0x00007ffff7b14a82 in _PyObject_GC_New (tp=0x7ffff7d9a3c0
<PyList_Type>) at Modules/gcmodule.c:1467
#11 0x00007ffff7a02405 in PyList_New (size=168) at
Objects/listobject.c:142
#12 0x00007ffff2a2c395 in Pdata_popList (self=0x7fffc1c1ff90, start=80) at
/home/simon/SAGE/debug/sage-5.6.beta1/spkg/build/python-2.7.3.p5/src/Modules/cPickle.c:306
#13 0x00007ffff2a3a0ee in do_append (self=0x7fffc26c17a0, x=80) at
/home/simon/SAGE/debug/sage-5.6.beta1/spkg/build/python-2.7.3.p5/src/Modules/cPickle.c:4401
#14 0x00007ffff2a3a603 in load_appends (self=0x7fffc26c17a0) at
/home/simon/SAGE/debug/sage-5.6.beta1/spkg/build/python-2.7.3.p5/src/Modules/cPickle.c:4450
#15 0x00007ffff2a3b875 in load (self=0x7fffc26c17a0) at
/home/simon/SAGE/debug/sage-5.6.beta1/spkg/build/python-2.7.3.p5/src/Modules/cPickle.c:4835
#16 0x00007ffff2a3cbf9 in Unpickler_load (self=0x7fffc26c17a0, unused=0x0)
at
/home/simon/SAGE/debug/sage-5.6.beta1/spkg/build/python-2.7.3.p5/src/Modules/cPickle.c:5393
#17 0x00007ffff7ac675c in call_function (pp_stack=0x7fffffff81e0, oparg=0)
at Python/ceval.c:4005
#18 0x00007ffff7ac16ba in PyEval_EvalFrameEx (f=0x301ca10, throwflag=0) at
Python/ceval.c:2666
#19 0x00007ffff7ac708a in fast_function (func=0x7fffc1bac060,
pp_stack=0x7fffffff8560, n=2, na=2, nk=0) at Python/ceval.c:4107
#20 0x00007ffff7ac6d76 in call_function (pp_stack=0x7fffffff8560, oparg=1)
at Python/ceval.c:4042
#21 0x00007ffff7ac16ba in PyEval_EvalFrameEx (f=0x301c800, throwflag=0) at
Python/ceval.c:2666
#22 0x00007ffff7ac708a in fast_function (func=0x7fffc1bac108,
pp_stack=0x7fffffff88e0, n=3, na=3, nk=0) at Python/ceval.c:4107
#23 0x00007ffff7ac6d76 in call_function (pp_stack=0x7fffffff88e0, oparg=2)
at Python/ceval.c:4042
#24 0x00007ffff7ac16ba in PyEval_EvalFrameEx (f=0x301c5d0, throwflag=0) at
Python/ceval.c:2666
#25 0x00007ffff7ac708a in fast_function (func=0x7fffc1baf258,
pp_stack=0x7fffffff8c60, n=2, na=2, nk=0) at Python/ceval.c:4107
#26 0x00007ffff7ac6d76 in call_function (pp_stack=0x7fffffff8c60, oparg=1)
at Python/ceval.c:4042
#27 0x00007ffff7ac16ba in PyEval_EvalFrameEx (f=0x301c3a0, throwflag=0) at
Python/ceval.c:2666
#28 0x00007ffff7ac40aa in PyEval_EvalCodeEx (co=0x7fffc1c57d50,
globals=0x2f88d70, locals=0x0, args=0x7fffc2720358, argcount=2, kws=0x0,
kwcount=0, defs=0x0, defcount=0, closure=0x0)
at Python/ceval.c:3253
#29 0x00007ffff79fd3fb in function_call (func=0x7fffc1baf1b0,
arg=0x7fffc2720330, kw=0x0) at Objects/funcobject.c:526
#30 0x00007ffff79be33e in PyObject_Call (func=0x7fffc1baf1b0,
arg=0x7fffc2720330, kw=0x0) at Objects/abstract.c:2529
#31 0x00007ffff79da311 in instancemethod_call (func=0x7fffc1baf1b0,
arg=0x7fffc2720330, kw=0x0) at Objects/classobject.c:2578
...
}}}
I'd say this is something we now try to understand what is happening here.
Could it be that there is some unpickle function that is not correctly
raising the refcount?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13864#comment:78>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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