Here's the bt for the latter example:
#0 visit_decref (op=0xfdc9906aac2f2efe, data=0x0) at Modules/gcmodule.c:360
#1 0x00003fffad7f61e0 in
__pyx_tp_traverse_4sage_4misc_9randstate_randstate (
o=0x3ffb1a37c5d0, v=@0x3fffb7f62aa8: 0x3fffb7eb91d0 <visit_decref>,
a=0x0)
at
/home/jpflori/sage.git/src/build/cythonized/sage/misc/randstate.c:5496
#2 0x00003fffb7eb95dc in subtract_refs (
containers=0x3fffb7f4db10 <generations+96>) at Modules/gcmodule.c:385
#3 collect (generation=<optimized out>) at Modules/gcmodule.c:925
#4 0x00003fffb7eba490 in gc_collect (self=<optimized out>,
args=<optimized out>, kws=<optimized out>) at Modules/gcmodule.c:1121
#5 0x00003fffb7dc77cc in PyCFunction_Call (func=0x3fffb0081878,
arg=<optimized out>, kw=<optimized out>) at Objects/methodobject.c:85
#6 0x00003fffb7e5d728 in call_function (oparg=<optimized out>,
pp_stack=0x3fffffffa228) at Python/ceval.c:4352
On Thursday, May 11, 2017 at 12:09:55 PM UTC+2, vdelecroix wrote:
>
> The bug also shows up with
> {{{
> sage: a = matrix(QQ, 1)
> sage: a.randomize()
> sage: del a
> sage: import gc
> sage: gc.collect()
> }}}
>
> On 11/05/2017 11:55, Dima Pasechnik wrote:
> > given libpthread being involved, I guess it might have to do with GIL vs
> > NOGIL stuff...
> >
> >
> > On Thursday, May 11, 2017 at 10:50:39 AM UTC+1, vdelecroix wrote:
> >>
> >> Dear all,
> >>
> >> While working on [1] I stumbled on a strange segfault. Namely, with the
> >> branch applied I got
> >>
> >> {{{
> >> sage: a = matrix(QQ, 1)
> >> sage: a.randomize()
> >> sage: quit
> >> Exiting Sage (CPU time 0m1.48s, Wall time 0m5.80s).
> >>
> ------------------------------------------------------------------------
> >> .../cysignals/signals.so
> >> .../cysignals/signals.so
> >> .../cysignals/signals.so
> >> .../libpthread.so.0
> >> .../libpython2.7.so.1.0
> >> .../sage/misc/randstate.so
> >> <snip>
> >>
> ------------------------------------------------------------------------
> >> Unhandled SIGSEGV: A segmentation fault occurred.
> >>
> ------------------------------------------------------------------------
> >> }}}
> >>
> >> I indeed modified the randomization method to use flint random
> >> generators, you can have a look at commits [2] and [3]. But I don't
> >> understand at all where the error might come from.
> >>
> >> Any help would be more than welcome!
> >>
> >> [1] https://trac.sagemath.org/ticket/22970
> >> [2]
> >>
> >>
> https://git.sagemath.org/sage.git/commit?id=b52e2c347a28b301485c6cc5bb221873ca5ac636
>
> >> [3]
> >>
> >>
> https://git.sagemath.org/sage.git/commit?id=d5ea72b364534c3ce4374c6d78b54852c8333cc3
>
> >>
> >> Best,
> >> Vincent
> >>
> >
>
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