Re: crash on __gmpz_init
Hi Marc, thanks for the quick answer on the first case. But the issue is also present if I use malloc in C. Bests Igor P On 22/01/24 11:02, Marc Glisse wrote: Hello, mpz_class M[LINES][COLS]; you are trying to put an array with millions of elements on the stack, so the stack overflows. Very large arrays need to be allocated on the heap in C++ (new, malloc, or some wrapper like std::vector). On Mon, 22 Jan 2024, igor pesando - Dept of Physics, University of Torino wrote: Hi *, first of all thanks for your work. The programs are attached as required. Best regards Igor Pesando * The issue I have is that the allocation in of a matrix in c++ crashes the program with SEGFAULT if the dimension are big enough. LINES and COLS are the number of lines and columns of a matrix. g++ -DLINES=5000 -DCOLS=5000 test2_mem.cpp -lgmp -lgmpxx -o t_500x500 ./t_500x500 version6.2.1; bits/limb 64 g++ -DLINES=5000 -DCOLS=5000 test2_mem.cpp -lgmp -lgmpxx -o t_5000x5000 ./t_5000x5000 Segmentation fault (core dumped) The issue is not that my computer has not enough memory. In facts when I run the corresponding program in C it crashes in __gmpz_init BUT it does not crash when I allocate twice as much memory (SC is the scaling factor for the allocated memory). gcc -DLINES=500 -DCOLS=500 -DSC=1 test2_mem.c -lgmp -o tc_500x500 ./tc_500x500 allocating 25; size=16 gcc -DLINES=5000 -DCOLS=5000 -DSC=1 test2_mem.c -lgmp -o tc_5000x5000 igor@igor7a:~/tex/LCSFT/cpp/BUG_GMP_20240122$ ./tc_5000x5000 allocating 2500; size=16 gcc -DLINES=7000 -DCOLS=5000 -DSC=1 test2_mem.c -lgmp -o tc_7000x5000 ./tc_7000x5000 -g allocating 3500; size=16 Segmentation fault (core dumped) Twice as much memory gcc -DLINES=7000 -DCOLS=5000 -DSC=2 test2_mem.c -lgmp -o tc_7000x5000x2 ./tc_7000x5000x2 allocating 3500; size=16 ** GDB gdb ./tc_7000x5000 (gdb) r Starting program: /home/igor/tex/LCSFT/cpp/BUG_GMP_20240122/tc_7000x5000 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". allocating 3500; size=16 Program received signal SIGSEGV, Segmentation fault. 0x77f39c9b in __gmpz_init () from /lib/x86_64-linux-gnu/libgmp.so.10 (gdb) bt #0 0x77f39c9b in __gmpz_init () from /lib/x86_64-linux-gnu/libgmp.so.10 #1 0x52e9 in main () at test2_mem.c:28 #1 0x52e9 in main () at test2_mem.c:28 (gdb) f 1 #1 0x52e9 in main () at test2_mem.c:28 28 mpz_init( M[ lin*LINES +col] ); (gdb) p lin $1 = 5000 (gdb) p col $2 = 63 (gdb) here lin is Please include the following in any report: The GMP version number, and if pre-packaged or patched then say so. gmp pre-packaged 6.2.1 gmp 6.3.0 from sources A test program that makes it possible for us to reproduce the bug. Include instructions on how to run the program. In attachment A description of what is wrong. If the results are incorrect, in what way. If you get a crash, say so. If you get a crash, include a stack backtrace from the debugger if it’s informative (‘where’ in gdb, or ‘$C’ in adb). Above Please do not send core dumps, executables or straces. The ‘configure’ options you used when building GMP, if any. The output from ‘configure’, as printed to stdout, with any options used. The name of the compiler and its version. For gcc, get the version with ‘gcc -v’, otherwise perhaps ‘what `which cc`’, or similar. gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --w
crash on __gmpz_init
Hi *, first of all thanks for your work. The programs are attached as required. Best regards Igor Pesando * The issue I have is that the allocation in of a matrix in c++ crashes the program with SEGFAULT if the dimension are big enough. LINES and COLS are the number of lines and columns of a matrix. g++ -DLINES=5000 -DCOLS=5000 test2_mem.cpp -lgmp -lgmpxx -o t_500x500 ./t_500x500 version6.2.1; bits/limb 64 g++ -DLINES=5000 -DCOLS=5000 test2_mem.cpp -lgmp -lgmpxx -o t_5000x5000 ./t_5000x5000 Segmentation fault (core dumped) The issue is not that my computer has not enough memory. In facts when I run the corresponding program in C it crashes in __gmpz_init BUT it does not crash when I allocate twice as much memory (SC is the scaling factor for the allocated memory). gcc -DLINES=500 -DCOLS=500 -DSC=1 test2_mem.c -lgmp -o tc_500x500 ./tc_500x500 allocating 25; size=16 gcc -DLINES=5000 -DCOLS=5000 -DSC=1 test2_mem.c -lgmp -o tc_5000x5000 igor@igor7a:~/tex/LCSFT/cpp/BUG_GMP_20240122$ ./tc_5000x5000 allocating 2500; size=16 gcc -DLINES=7000 -DCOLS=5000 -DSC=1 test2_mem.c -lgmp -o tc_7000x5000 ./tc_7000x5000 -g allocating 3500; size=16 Segmentation fault (core dumped) Twice as much memory gcc -DLINES=7000 -DCOLS=5000 -DSC=2 test2_mem.c -lgmp -o tc_7000x5000x2 ./tc_7000x5000x2 allocating 3500; size=16 ** GDB gdb ./tc_7000x5000 (gdb) r Starting program: /home/igor/tex/LCSFT/cpp/BUG_GMP_20240122/tc_7000x5000 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". allocating 3500; size=16 Program received signal SIGSEGV, Segmentation fault. 0x77f39c9b in __gmpz_init () from /lib/x86_64-linux-gnu/libgmp.so.10 (gdb) bt #0 0x77f39c9b in __gmpz_init () from /lib/x86_64-linux-gnu/libgmp.so.10 #1 0x52e9 in main () at test2_mem.c:28 #1 0x52e9 in main () at test2_mem.c:28 (gdb) f 1 #1 0x52e9 in main () at test2_mem.c:28 28mpz_init( M[ lin*LINES +col] ); (gdb) p lin $1 = 5000 (gdb) p col $2 = 63 (gdb) here lin is Please include the following in any report: The GMP version number, and if pre-packaged or patched then say so. gmp pre-packaged 6.2.1 gmp 6.3.0 from sources A test program that makes it possible for us to reproduce the bug. Include instructions on how to run the program. In attachment A description of what is wrong. If the results are incorrect, in what way. If you get a crash, say so. If you get a crash, include a stack backtrace from the debugger if it’s informative (‘where’ in gdb, or ‘$C’ in adb). Above Please do not send core dumps, executables or straces. The ‘configure’ options you used when building GMP, if any. The output from ‘configure’, as printed to stdout, with any options used. The name of the compiler and its version. For gcc, get the version with ‘gcc -v’, otherwise perhaps ‘what `which cc`’, or similar. gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/11/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-XeT9lY/gcc-11-11.4.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
