https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94620
Bug ID: 94620 Summary: GCC 9.2.1 segfaults when compiling file with -O3 Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: ola.olsson at acconeer dot com Target Milestone: --- Created attachment 48291 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48291&action=edit Preprocessed ffile of the smallest example I could make Hi, I compiled the c-file version of the attached file with: $ gcc -v -save-temps -fsanitize=undefined -fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -Wall -Wextra -O3 -c segfault.c > gcc_info 2>&1 The issue does not happen if I use -O0. $ cat gcc_info Using built-in specs. COLLECT_GCC=gcc OFFLOAD_TARGET_NAMES=nvptx-none:hsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --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 --with-target-system-zlib=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv' '-fno-aggressive-loop-optimizations' '-Wall' '-Wextra' '-O3' '-c' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/9/cc1 -E -quiet -v -imultiarch x86_64-linux-gnu segfault.c -mtune=generic -march=x86-64 -Wall -Wextra -fsanitize=undefined -fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -O3 -fpch-preprocess -fasynchronous-unwind-tables -fstack-protector-strong -Wformat-security -fstack-clash-protection -fcf-protection -o segfault.i ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/9/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-linux-gnu/9/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/9/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fsanitize=undefined' '-fno-strict-aliasing' '-fwrapv' '-fno-aggressive-loop-optimizations' '-Wall' '-Wextra' '-O3' '-c' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/9/cc1 -fpreprocessed segfault.i -quiet -dumpbase segfault.c -mtune=generic -march=x86-64 -auxbase segfault -O3 -Wall -Wextra -version -fsanitize=undefined -fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations -fasynchronous-unwind-tables -fstack-protector-strong -Wformat-security -fstack-clash-protection -fcf-protection -o segfault.s GNU C17 (Ubuntu 9.2.1-9ubuntu2) version 9.2.1 20191008 (x86_64-linux-gnu) compiled by GNU C version 9.2.1 20191008, GMP version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.21-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C17 (Ubuntu 9.2.1-9ubuntu2) version 9.2.1 20191008 (x86_64-linux-gnu) compiled by GNU C version 9.2.1 20191008, GMP version 6.1.2, MPFR version 4.0.2, MPC version 1.1.0, isl version isl-0.21-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: dd54e5384b34908287640134d9f8a49c during IPA pass: inline segfault.c: In function ‘get_element’: segfault.c:8:5: internal compiler error: Segmentation fault 8 | int get_element(a_struct *m, int row, int col) | ^~~~~~~~~~~ Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.