Assertion failure in mpz_divexact()

Francesco Biscani bluescarni at gmail.com
Sun Aug 27 15:40:56 UTC 2017


I am experiencing an assertion failure in mpz_divexact() using the latest
GMP from the unstable branch. I am attaching a test program exhibiting the
issue.

GMP was configured with the following options, after the bootstrap:

./configure --disable-shared --enable-assert --enable-alloca=debug
--disable-assembly

I am attaching the output of the configure command.

The output of 'gcc -v' is:

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-7.1.0-r1/work/gcc-7.1.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.1.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.1.0/include/g++-v7
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.1.0/python
--enable-objc-gc --enable-languages=c,c++,go,objc,fortran --enable-obsolete
--enable-secureplt --disable-werror --with-system-zlib --enable-nls
--without-included-gettext --enable-checking=release --with-bugurl=
https://bugs.gentoo.org/ --with-pkgversion='Gentoo 7.1.0-r1 p1.1'
--disable-esp --enable-libstdcxx-time --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-altivec
--disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--enable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto
--with-isl --disable-isl-version-check --enable-libsanitizer
--disable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.1.0 (Gentoo 7.1.0-r1 p1.1)

The output of 'uname -a':

Linux berserk 4.12.7 #5 SMP Wed Aug 16 15:11:35 CEST 2017 x86_64 AMD Ryzen
7 1700 Eight-Core Processor AuthenticAMD GNU/Linux

The output of 'config.guess':

zen-pc-linux-gnu

The output of 'configfsf.guess':

x86_64-pc-linux-gnu

The assertion failure prints:

sbpi1_bdiv_q.c:58: GNU MP assertion failed: (dp[0] * dinv) == 0

Please let me know if you need further information. Best regards,

  Francesco Biscani.
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config.status: config.h is unchanged
config.status: linking mpn/generic/add.c to mpn/add.c
config.status: linking mpn/generic/add_1.c to mpn/add_1.c
config.status: linking mpn/generic/add_n.c to mpn/add_n.c
config.status: linking mpn/generic/sub.c to mpn/sub.c
config.status: linking mpn/generic/sub_1.c to mpn/sub_1.c
config.status: linking mpn/generic/sub_n.c to mpn/sub_n.c
config.status: linking mpn/generic/cnd_add_n.c to mpn/cnd_add_n.c
config.status: linking mpn/generic/cnd_sub_n.c to mpn/cnd_sub_n.c
config.status: linking mpn/generic/cnd_swap.c to mpn/cnd_swap.c
config.status: linking mpn/generic/neg.c to mpn/neg.c
config.status: linking mpn/generic/com.c to mpn/com.c
config.status: linking mpn/generic/mul_1.c to mpn/mul_1.c
config.status: linking mpn/generic/addmul_1.c to mpn/addmul_1.c
config.status: linking mpn/generic/submul_1.c to mpn/submul_1.c
config.status: linking mpn/generic/add_err1_n.c to mpn/add_err1_n.c
config.status: linking mpn/generic/add_err2_n.c to mpn/add_err2_n.c
config.status: linking mpn/generic/add_err3_n.c to mpn/add_err3_n.c
config.status: linking mpn/generic/sub_err1_n.c to mpn/sub_err1_n.c
config.status: linking mpn/generic/sub_err2_n.c to mpn/sub_err2_n.c
config.status: linking mpn/generic/sub_err3_n.c to mpn/sub_err3_n.c
config.status: linking mpn/generic/lshift.c to mpn/lshift.c
config.status: linking mpn/generic/rshift.c to mpn/rshift.c
config.status: linking mpn/generic/dive_1.c to mpn/dive_1.c
config.status: linking mpn/generic/diveby3.c to mpn/diveby3.c
config.status: linking mpn/generic/divis.c to mpn/divis.c
config.status: linking mpn/generic/divrem.c to mpn/divrem.c
config.status: linking mpn/generic/divrem_1.c to mpn/divrem_1.c
config.status: linking mpn/generic/divrem_2.c to mpn/divrem_2.c
config.status: linking mpn/generic/fib2_ui.c to mpn/fib2_ui.c
config.status: linking mpn/generic/mod_1.c to mpn/mod_1.c
config.status: linking mpn/generic/mod_34lsub1.c to mpn/mod_34lsub1.c
config.status: linking mpn/generic/mode1o.c to mpn/mode1o.c
config.status: linking mpn/generic/pre_divrem_1.c to mpn/pre_divrem_1.c
config.status: linking mpn/generic/pre_mod_1.c to mpn/pre_mod_1.c
config.status: linking mpn/generic/dump.c to mpn/dump.c
config.status: linking mpn/generic/mod_1_1.c to mpn/mod_1_1.c
config.status: linking mpn/generic/mod_1_2.c to mpn/mod_1_2.c
config.status: linking mpn/generic/mod_1_3.c to mpn/mod_1_3.c
config.status: linking mpn/generic/mod_1_4.c to mpn/mod_1_4.c
config.status: linking mpn/generic/lshiftc.c to mpn/lshiftc.c
config.status: linking mpn/generic/mul.c to mpn/mul.c
config.status: linking mpn/generic/mul_fft.c to mpn/mul_fft.c
config.status: linking mpn/generic/mul_n.c to mpn/mul_n.c
config.status: linking mpn/generic/sqr.c to mpn/sqr.c
config.status: linking mpn/generic/mul_basecase.c to mpn/mul_basecase.c
config.status: linking mpn/generic/sqr_basecase.c to mpn/sqr_basecase.c
config.status: linking mpn/generic/nussbaumer_mul.c to mpn/nussbaumer_mul.c
config.status: linking mpn/generic/mulmid_basecase.c to mpn/mulmid_basecase.c
config.status: linking mpn/generic/toom42_mulmid.c to mpn/toom42_mulmid.c
config.status: linking mpn/generic/mulmid_n.c to mpn/mulmid_n.c
config.status: linking mpn/generic/mulmid.c to mpn/mulmid.c
config.status: linking mpn/generic/random.c to mpn/random.c
config.status: linking mpn/generic/random2.c to mpn/random2.c
config.status: linking mpn/generic/pow_1.c to mpn/pow_1.c
config.status: linking mpn/generic/rootrem.c to mpn/rootrem.c
config.status: linking mpn/generic/sqrtrem.c to mpn/sqrtrem.c
config.status: linking mpn/generic/sizeinbase.c to mpn/sizeinbase.c
config.status: linking mpn/generic/get_str.c to mpn/get_str.c
config.status: linking mpn/generic/set_str.c to mpn/set_str.c
config.status: linking mpn/generic/compute_powtab.c to mpn/compute_powtab.c
config.status: linking mpn/generic/scan0.c to mpn/scan0.c
config.status: linking mpn/generic/scan1.c to mpn/scan1.c
config.status: linking mpn/generic/popham.c to mpn/popcount.c
config.status: linking mpn/generic/popham.c to mpn/hamdist.c
config.status: linking mpn/generic/cmp.c to mpn/cmp.c
config.status: linking mpn/generic/zero_p.c to mpn/zero_p.c
config.status: linking mpn/generic/perfsqr.c to mpn/perfsqr.c
config.status: linking mpn/generic/perfpow.c to mpn/perfpow.c
config.status: linking mpn/generic/gcd_1.c to mpn/gcd_1.c
config.status: linking mpn/generic/gcd.c to mpn/gcd.c
config.status: linking mpn/generic/gcdext_1.c to mpn/gcdext_1.c
config.status: linking mpn/generic/gcdext.c to mpn/gcdext.c
config.status: linking mpn/generic/gcd_subdiv_step.c to mpn/gcd_subdiv_step.c
config.status: linking mpn/generic/gcdext_lehmer.c to mpn/gcdext_lehmer.c
config.status: linking mpn/generic/div_q.c to mpn/div_q.c
config.status: linking mpn/generic/tdiv_qr.c to mpn/tdiv_qr.c
config.status: linking mpn/generic/jacbase.c to mpn/jacbase.c
config.status: linking mpn/generic/jacobi_2.c to mpn/jacobi_2.c
config.status: linking mpn/generic/jacobi.c to mpn/jacobi.c
config.status: linking mpn/generic/get_d.c to mpn/get_d.c
config.status: linking mpn/generic/matrix22_mul.c to mpn/matrix22_mul.c
config.status: linking mpn/generic/matrix22_mul1_inverse_vector.c to mpn/matrix22_mul1_inverse_vector.c
config.status: linking mpn/generic/hgcd_matrix.c to mpn/hgcd_matrix.c
config.status: linking mpn/generic/hgcd2.c to mpn/hgcd2.c
config.status: linking mpn/generic/hgcd_step.c to mpn/hgcd_step.c
config.status: linking mpn/generic/hgcd_reduce.c to mpn/hgcd_reduce.c
config.status: linking mpn/generic/hgcd.c to mpn/hgcd.c
config.status: linking mpn/generic/hgcd_appr.c to mpn/hgcd_appr.c
config.status: linking mpn/generic/hgcd2_jacobi.c to mpn/hgcd2_jacobi.c
config.status: linking mpn/generic/hgcd_jacobi.c to mpn/hgcd_jacobi.c
config.status: linking mpn/generic/mullo_n.c to mpn/mullo_n.c
config.status: linking mpn/generic/mullo_basecase.c to mpn/mullo_basecase.c
config.status: linking mpn/generic/sqrlo.c to mpn/sqrlo.c
config.status: linking mpn/generic/sqrlo_basecase.c to mpn/sqrlo_basecase.c
config.status: linking mpn/generic/toom22_mul.c to mpn/toom22_mul.c
config.status: linking mpn/generic/toom32_mul.c to mpn/toom32_mul.c
config.status: linking mpn/generic/toom42_mul.c to mpn/toom42_mul.c
config.status: linking mpn/generic/toom52_mul.c to mpn/toom52_mul.c
config.status: linking mpn/generic/toom62_mul.c to mpn/toom62_mul.c
config.status: linking mpn/generic/toom33_mul.c to mpn/toom33_mul.c
config.status: linking mpn/generic/toom43_mul.c to mpn/toom43_mul.c
config.status: linking mpn/generic/toom53_mul.c to mpn/toom53_mul.c
config.status: linking mpn/generic/toom54_mul.c to mpn/toom54_mul.c
config.status: linking mpn/generic/toom63_mul.c to mpn/toom63_mul.c
config.status: linking mpn/generic/toom44_mul.c to mpn/toom44_mul.c
config.status: linking mpn/generic/toom6h_mul.c to mpn/toom6h_mul.c
config.status: linking mpn/generic/toom6_sqr.c to mpn/toom6_sqr.c
config.status: linking mpn/generic/toom8h_mul.c to mpn/toom8h_mul.c
config.status: linking mpn/generic/toom8_sqr.c to mpn/toom8_sqr.c
config.status: linking mpn/generic/toom_couple_handling.c to mpn/toom_couple_handling.c
config.status: linking mpn/generic/toom2_sqr.c to mpn/toom2_sqr.c
config.status: linking mpn/generic/toom3_sqr.c to mpn/toom3_sqr.c
config.status: linking mpn/generic/toom4_sqr.c to mpn/toom4_sqr.c
config.status: linking mpn/generic/toom_eval_dgr3_pm1.c to mpn/toom_eval_dgr3_pm1.c
config.status: linking mpn/generic/toom_eval_dgr3_pm2.c to mpn/toom_eval_dgr3_pm2.c
config.status: linking mpn/generic/toom_eval_pm1.c to mpn/toom_eval_pm1.c
config.status: linking mpn/generic/toom_eval_pm2.c to mpn/toom_eval_pm2.c
config.status: linking mpn/generic/toom_eval_pm2exp.c to mpn/toom_eval_pm2exp.c
config.status: linking mpn/generic/toom_eval_pm2rexp.c to mpn/toom_eval_pm2rexp.c
config.status: linking mpn/generic/toom_interpolate_5pts.c to mpn/toom_interpolate_5pts.c
config.status: linking mpn/generic/toom_interpolate_6pts.c to mpn/toom_interpolate_6pts.c
config.status: linking mpn/generic/toom_interpolate_7pts.c to mpn/toom_interpolate_7pts.c
config.status: linking mpn/generic/toom_interpolate_8pts.c to mpn/toom_interpolate_8pts.c
config.status: linking mpn/generic/toom_interpolate_12pts.c to mpn/toom_interpolate_12pts.c
config.status: linking mpn/generic/toom_interpolate_16pts.c to mpn/toom_interpolate_16pts.c
config.status: linking mpn/generic/invertappr.c to mpn/invertappr.c
config.status: linking mpn/generic/invert.c to mpn/invert.c
config.status: linking mpn/generic/binvert.c to mpn/binvert.c
config.status: linking mpn/generic/mulmod_bnm1.c to mpn/mulmod_bnm1.c
config.status: linking mpn/generic/sqrmod_bnm1.c to mpn/sqrmod_bnm1.c
config.status: linking mpn/generic/div_qr_1.c to mpn/div_qr_1.c
config.status: linking mpn/generic/div_qr_1n_pi1.c to mpn/div_qr_1n_pi1.c
config.status: linking mpn/generic/div_qr_2.c to mpn/div_qr_2.c
config.status: linking mpn/generic/div_qr_2n_pi1.c to mpn/div_qr_2n_pi1.c
config.status: linking mpn/generic/div_qr_2u_pi1.c to mpn/div_qr_2u_pi1.c
config.status: linking mpn/generic/sbpi1_div_q.c to mpn/sbpi1_div_q.c
config.status: linking mpn/generic/sbpi1_div_qr.c to mpn/sbpi1_div_qr.c
config.status: linking mpn/generic/sbpi1_divappr_q.c to mpn/sbpi1_divappr_q.c
config.status: linking mpn/generic/dcpi1_div_q.c to mpn/dcpi1_div_q.c
config.status: linking mpn/generic/dcpi1_div_qr.c to mpn/dcpi1_div_qr.c
config.status: linking mpn/generic/dcpi1_divappr_q.c to mpn/dcpi1_divappr_q.c
config.status: linking mpn/generic/mu_div_qr.c to mpn/mu_div_qr.c
config.status: linking mpn/generic/mu_divappr_q.c to mpn/mu_divappr_q.c
config.status: linking mpn/generic/mu_div_q.c to mpn/mu_div_q.c
config.status: linking mpn/generic/bdiv_q_1.c to mpn/bdiv_q_1.c
config.status: linking mpn/generic/sbpi1_bdiv_q.c to mpn/sbpi1_bdiv_q.c
config.status: linking mpn/generic/sbpi1_bdiv_qr.c to mpn/sbpi1_bdiv_qr.c
config.status: linking mpn/generic/sbpi1_bdiv_r.c to mpn/sbpi1_bdiv_r.c
config.status: linking mpn/generic/dcpi1_bdiv_q.c to mpn/dcpi1_bdiv_q.c
config.status: linking mpn/generic/dcpi1_bdiv_qr.c to mpn/dcpi1_bdiv_qr.c
config.status: linking mpn/generic/mu_bdiv_q.c to mpn/mu_bdiv_q.c
config.status: linking mpn/generic/mu_bdiv_qr.c to mpn/mu_bdiv_qr.c
config.status: linking mpn/generic/bdiv_q.c to mpn/bdiv_q.c
config.status: linking mpn/generic/bdiv_qr.c to mpn/bdiv_qr.c
config.status: linking mpn/generic/broot.c to mpn/broot.c
config.status: linking mpn/generic/brootinv.c to mpn/brootinv.c
config.status: linking mpn/generic/bsqrt.c to mpn/bsqrt.c
config.status: linking mpn/generic/bsqrtinv.c to mpn/bsqrtinv.c
config.status: linking mpn/generic/divexact.c to mpn/divexact.c
config.status: linking mpn/generic/bdiv_dbm1c.c to mpn/bdiv_dbm1c.c
config.status: linking mpn/generic/redc_1.c to mpn/redc_1.c
config.status: linking mpn/generic/redc_2.c to mpn/redc_2.c
config.status: linking mpn/generic/redc_n.c to mpn/redc_n.c
config.status: linking mpn/generic/powm.c to mpn/powm.c
config.status: linking mpn/generic/powlo.c to mpn/powlo.c
config.status: linking mpn/generic/sec_powm.c to mpn/sec_powm.c
config.status: linking mpn/generic/sec_mul.c to mpn/sec_mul.c
config.status: linking mpn/generic/sec_sqr.c to mpn/sec_sqr.c
config.status: linking mpn/generic/sec_div.c to mpn/sec_div_qr.c
config.status: linking mpn/generic/sec_div.c to mpn/sec_div_r.c
config.status: linking mpn/generic/sec_pi1_div.c to mpn/sec_pi1_div_qr.c
config.status: linking mpn/generic/sec_pi1_div.c to mpn/sec_pi1_div_r.c
config.status: linking mpn/generic/sec_aors_1.c to mpn/sec_add_1.c
config.status: linking mpn/generic/sec_aors_1.c to mpn/sec_sub_1.c
config.status: linking mpn/generic/sec_invert.c to mpn/sec_invert.c
config.status: linking mpn/generic/trialdiv.c to mpn/trialdiv.c
config.status: linking mpn/generic/remove.c to mpn/remove.c
config.status: linking mpn/generic/logops_n.c to mpn/and_n.c
config.status: linking mpn/generic/logops_n.c to mpn/andn_n.c
config.status: linking mpn/generic/logops_n.c to mpn/nand_n.c
config.status: linking mpn/generic/logops_n.c to mpn/ior_n.c
config.status: linking mpn/generic/logops_n.c to mpn/iorn_n.c
config.status: linking mpn/generic/logops_n.c to mpn/nior_n.c
config.status: linking mpn/generic/logops_n.c to mpn/xor_n.c
config.status: linking mpn/generic/logops_n.c to mpn/xnor_n.c
config.status: linking mpn/generic/copyi.c to mpn/copyi.c
config.status: linking mpn/generic/copyd.c to mpn/copyd.c
config.status: linking mpn/generic/zero.c to mpn/zero.c
config.status: linking mpn/generic/sec_tabselect.c to mpn/sec_tabselect.c
config.status: linking mpn/generic/comb_tables.c to mpn/comb_tables.c
config.status: linking mpn/generic/add_n_sub_n.c to mpn/add_n_sub_n.c
config.status: linking mpn/generic/gmp-mparam.h to gmp-mparam.h
config.status: executing libtool commands
configure: summary of build options:

  Version:           GNU MP 6.1.99
  Host type:         zen-pc-linux-gnu
  ABI:               64
  Install prefix:    /usr/local
  Compiler:          gcc
  Static libraries:  yes
  Shared libraries:  no

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