Dear Alexei, I am sorry for the incomplete initial report on the problem. The requested information is: a. a backtrace. (gdb) r Starting program: /usr/local/distrib/math/ginac/check/.libs/lt-exam_cra examining Garner's integer chinese remainder algorithm Program received signal SIGSEGV, Segmentation fault. 0xb7bed2d0 in cln::find_modint_ring () from /usr/lib/libcln.so.5 (gdb) where #0 0xb7bed2d0 in cln::find_modint_ring () from /usr/lib/libcln.so.5 #1 0xb7ecd21f in compute_mix_radix_coeffs (dst=@0xbff5c570, residues=@0xbff5c728, moduli=@0xbff5c734, recips=@0xbff5c57c) at polynomial/cra_garner.cpp:44 #2 0xb7ece857 in cln::integer_cra (residues=@0xbff5c728, moduli=@0xbff5c734) at polynomial/cra_garner.cpp:81 #3 0x0804a140 in run_test_once (lim=<value optimized out>) at exam_cra.cpp:40 #4 0x0804aa57 in main () at exam_cra.cpp:65 b. compiler version (and compilation options) the current version in Debian/testing. $ gcc -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.2-1' --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-cld --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.3.2 (Debian 4.3.2-1) c. version of CLN---the current version in Debian/testing. ii libcln5 1.2.2-2 Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv@maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/