Created attachment 595858 [details] Minimal code that triggers a segfault Compiling the attached invalid OpenMP C++ code with g++ -O2 -fopenmp leads to a segmentation fault: $ g++ -O2 -fopenmp gccsegfault.cc gccsegfault.cc: In function 'int main()': gccsegfault.cc:7:3: internal compiler error: Segmentation fault 7 | } | ^ Please submit a full bug report, with preprocessed source if appropriate. See <https://bugs.gentoo.org/> for instructions. Compiling with g++ -fopenmp works as expected, i.e. there is an unreadable wall of text because there are missing parentheses after v.end in the comparison part of the for loop. I did not try older versions of gcc. $ g++ -v Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/9.2.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /var/tmpnomem/portage/sys-devel/gcc-9.2.0-r2/work/gcc-9.2.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/9.2.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.2.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.2.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.2.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/9.2.0/python --enable-languages=c,c++,go,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 9.2.0-r2 p3' --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 --enable-libgomp --disable-libmudflap --disable-libssp --disable-systemtap --enable-vtable-verify --enable-lto --without-isl --enable-default-pie --enable-default-ssp Thread model: posix gcc version 9.2.0 (Gentoo 9.2.0-r2 p3)
Confirmed. Looking.
Filed upstream bug as: https://gcc.gnu.org/PR92504
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/proj/gcc-patches.git/commit/?id=e9c37fb661aed82754e6fd374457a88d697e3091 commit e9c37fb661aed82754e6fd374457a88d697e3091 Author: Sergei Trofimovich <slyfox@gentoo.org> AuthorDate: 2019-11-19 22:55:04 +0000 Commit: Sergei Trofimovich <slyfox@gentoo.org> CommitDate: 2019-11-19 22:55:04 +0000 9.2.0: backport openmp for loop SIGSEGV fix Reported-by: Marc Vinyals Bug: https://gcc.gnu.org/PR92504 Bug: https://bugs.gentoo.org/699938 Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org> 9.2.0/gentoo/31_all_openmp-for-SEGV.patch | 62 +++++++++++++++++++++++++++++++ 9.2.0/gentoo/README.history | 3 ++ 2 files changed, 65 insertions(+)
Queued upstream fix for next 9.2.0 patchset as https://gitweb.gentoo.org/proj/gcc-patches.git/plain/9.2.0/gentoo/31_all_openmp-for-SEGV.patch The patchset should be released in a few weeks. Until now if you want to test a fix you can drop the patch to /etc/portage/patches/sys-devel/gcc:9.2.0/ and rebuild gcc.
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/proj/gcc-patches.git/commit/?id=35beff919bc59076c5c1aa549e04d8119c559261 commit 35beff919bc59076c5c1aa549e04d8119c559261 Author: Sergei Trofimovich <slyfox@gentoo.org> AuthorDate: 2019-12-22 11:07:00 +0000 Commit: Sergei Trofimovich <slyfox@gentoo.org> CommitDate: 2019-12-22 11:07:00 +0000 9.2.0: cut 4 patchset 4 new patches: - 27_all_sparc-PIC-constant-PR91472.patch: fix PIC register alocation (bug detected by gmp test suite) - 31_all_openmp-for-SEGV.patch: fix opemnmp for loop condition folding - 32_all_sparc-PIC-constant-part2.patch: fix PIC register allocation (bug detected by python regressin) - 33_all_extend-lifetime.patch: fix lifetime extension on ':?' operator (bug detected by firefox LTO build Bug: https://gcc.gnu.org/PR91472 Bug: https://bugs.gentoo.org/699938 Bug: https://gcc.gnu.org/PR92504 Bug: https://bugs.gentoo.org/697708 Bug: https://gcc.gnu.org/PR92095 Bug: https://bugs.gentoo.org/701866 Bug: https://gcc.gnu.org/PR92831 Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org> 9.2.0/gentoo/README.history | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=649ef16ea81488d36fae3fa4a8881c9e665d2e7a commit 649ef16ea81488d36fae3fa4a8881c9e665d2e7a Author: Sergei Trofimovich <slyfox@gentoo.org> AuthorDate: 2019-12-22 11:24:45 +0000 Commit: Sergei Trofimovich <slyfox@gentoo.org> CommitDate: 2019-12-22 11:28:34 +0000 sys-devel/gcc: 9.2.0: cut 4 patchset 4 new patches: - 27_all_sparc-PIC-constant-PR91472.patch: fix PIC register alocation (bug detected by gmp test suite) - 31_all_openmp-for-SEGV.patch: fix opemnmp for loop condition folding - 32_all_sparc-PIC-constant-part2.patch: fix PIC register allocation (bug detected by python regressin) - 33_all_extend-lifetime.patch: fix lifetime extension on ':?' operator (bug detected by firefox LTO build Bug: https://gcc.gnu.org/PR91472 Bug: https://bugs.gentoo.org/699938 Bug: https://gcc.gnu.org/PR92504 Bug: https://bugs.gentoo.org/697708 Bug: https://gcc.gnu.org/PR92095 Bug: https://bugs.gentoo.org/701866 Bug: https://gcc.gnu.org/PR92831 Package-Manager: Portage-2.3.82, Repoman-2.3.20 Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org> sys-devel/gcc/Manifest | 1 + sys-devel/gcc/gcc-9.2.0-r3.ebuild | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+)
Should be fixed in gcc-9.2.0-r3. Thank you for the perfect report!
