[Debian-science-sagemath] cypari2 hangs on ppc64el when pari stack overflows

[Jeroen Demeyer]

On 2018-10-06 11:36, Tobias Hansen wrote:
> Hi,
>
> sagemath 8.3 currently fails to build on ppc64el

Is that a typo for ppc64le or is that something else? I have

$ uname -a
Linux sardonis 4.4.0-124-generic #148-Ubuntu SMP Wed May 2 13:02:22 UTC 
2018 ppc64le ppc64le ppc64le GNU/Linux

> import cypari2
> pari = cypari2.Pari()
> pari.allocatemem(200000)
> pari('x^2 + 10^100 + 1').nfinit()

This doesn't actually stack overflow for me (PARI-2.11, cypari2-1.2.1, 
cysignals-1.7.2):

 >>> import cypari2
 >>> pari = cypari2.Pari()
 >>> pari.allocatemem(200000)
PARI stack size set to 200000 bytes, maximum size set to 8060928
 >>> pari('x^2 + 10^100 + 1').nfinit()
*** _aprcl_step4_worker: Warning: increasing stack size to 400000.
*** _aprcl_step4_worker: Warning: increasing stack size to 800000.
[x^2 + 
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001, 
[0, 1], 
-40000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004, 
1, [Mat([1, 0.E-134 + 1.00000000000000 E50*I]), [1, 1.00000000000000 
E50; 1, -1.00000000000000 E50], [1, 
100000000000000000000000000000000000000000000000000; 1, 
-100000000000000000000000000000000000000000000000000], [2, 0; 0, 
-20000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002], 
[20000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002, 
0; 0, 2], 
[10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001, 
0; 0, -1], 
[10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001, 
[0, 
-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001; 
1, 0]], [2, 73, 137, 401, 1201, 1601, 1676321, 5964848081, 
129694419029057750551385771184564274499075700947656757821537291527196801]], 
[0.E-134 + 1.00000000000000 E50*I], [1, x], [1, 0; 0, 1], [1, 0, 0, 
-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001; 
0, 1, 1, 0]]


Cheers,
Jeroen (cypari2 and cysignals maintainer)