Bug#863919: sympow segfaults with basic input

[Ximin Luo]

Package: sympow
Version: 1.023-8
Severity: important

Dear Maintainer,

sympow now segfaults with basic input, possibly due to libc upgrades - I didn't
see these before when we were testing with Sage 7.4. The failure is definitely
independent of Sage:

$ gdb -q sympow
Reading symbols from sympow...Reading symbols from /usr/lib/debug/.build-id/4a/af4652689eadb85484e33a562f7ff64ecc20d9.debug...done.
done.
(gdb) run -curve "[0,-1,1,-10,-20]" -analrank
Starting program: /usr/bin/sympow -curve "[0,-1,1,-10,-20]" -analrank
sympow 1.023 RELEASE (Debian 1.023-8)  (c) Mark Watkins --- see README and COPYING for details
Minimal model of curve  is [0,-1,1,-10,-20]
At 11: Inertia Group is  C1 MULTIPLICATIVE REDUCTION
Conductor is 11
sp 1: Conductor at 11 is 1+0, root number is -1
sp 1: Euler factor at 11 is 1-1*x
1st sym power conductor is 11, global root number is 1
NT 1d0: 7
Maximal number of terms is 7
0.0E+00
Done with small primes 1049

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ab6344 in free () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0  0x00007ffff7ab6344 in free () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x000055555558905a in free_data () at util.c:28
#2  0x0000555555556650 in prep_analrank (UB=35184372088832, sl=<optimized out>) at analrank.c:21
#3  0x0000555555555d66 in main (argc=<optimized out>, argv=<optimized out>) at main.c:258


-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'buildd-unstable'), (300, 'unstable'), (100, 'experimental'), (1, 'experimental-debug')
Architecture: amd64
 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages sympow depends on:
ii  dpkg         1.18.24
ii  libc6        2.24-10
ii  pari-gp      2.9.1-1
ii  sympow-data  1.023-8

sympow recommends no packages.

sympow suggests no packages.

-- no debconf information