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From: "amy at amyspark dot me" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109806] New: 13.1.0 cc1plus stack smashing crash with C
 array of complex structs
Date: Thu, 11 May 2023 02:26:03 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: amy at amyspark dot me
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109806

            Bug ID: 109806
           Summary: 13.1.0 cc1plus stack smashing crash with C array of
                    complex structs
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: amy at amyspark dot me
  Target Milestone: ---

Hi,

Coming from
https://github.com/msys2/MINGW-packages/pull/16968#issuecomment-1541465457.
I've found a crash in cc1plus 13.1.0 when building an array of ~68 structs =
in
C++. The crash yields no report or crash handling, it just causes g++  to
return exit code 1.

However, I was able to trap the cc1plus execution line, and then run it
manually under GDB. This yielded a symbolicated stacktrace that I've upload=
ed
along with the preprocessed file (it's 1.6MB, so it was impossible to attach
them here uncompressed):

https://gist.github.com/amyspark/be93638fc5b5779594dd138aa8995860

GCC version data:

Using built-in specs.
COLLECT_GCC=3DD:\msys64\ucrt64\bin\gcc.exe
COLLECT_LTO_WRAPPER=3DD:/msys64/ucrt64/bin/../lib/gcc/x86_64-w64-mingw32/13=
.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-13.1.0/configure --prefix=3D/ucrt64
--with-local-prefix=3D/ucrt64/local --build=3Dx86_64-w64-mingw32
--host=3Dx86_64-w64-mingw32 --target=3Dx86_64-w64-mingw32
--with-native-system-header-dir=3D/ucrt64/include --libexecdir=3D/ucrt64/lib
--enable-bootstrap --enable-checking=3Drelease --with-arch=3Dnocona
--with-tune=3Dgeneric --enable-languages=3Dc,lto,c++,fortran,ada,objc,obj-c=
++,jit
--enable-shared --enable-static --enable-libatomic --enable-threads=3Dposix
--enable-graphite --enable-fully-dynamic-string
--enable-libstdcxx-filesystem-ts --enable-libstdcxx-time
--disable-libstdcxx-pch --enable-lto --enable-libgomp --disable-libssp
--disable-multilib --disable-rpath --disable-win32-registry --disable-nls
--disable-werror --disable-symvers --with-libiconv --with-system-zlib
--with-gmp=3D/ucrt64 --with-mpfr=3D/ucrt64 --with-mpc=3D/ucrt64 --with-isl=
=3D/ucrt64
--with-pkgversion=3DRev4, Built by MSYS2 project
--with-bugurl=3Dhttps://github.com/msys2/MINGW-packages/issues --with-gnu-as
--with-gnu-ld --enable-libstdcxx-debug --with-boot-ldflags=3D"-static-libst=
dc++"
--with-stage1-ldflags=3D"-static-libstdc++"
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.1.0 (Rev4, Built by MSYS2 project)=20

Prior to https://github.com/msys2/MINGW-packages/pull/17094, the CFLAGS val=
ue
was (I added debug !strip to the PKGBUILD options to get debugging symbols):

-g -march=3Dnocona -msahf -mtune=3Dgeneric -O2 -pipe -Wp,-D_FORTIFY_SOURCE=
=3D2
-fstack-protector-strong -ggdb -Og
-ffile-prefix-map=3D/c/Users/Amalia/Desktop/MINGW-packages/mingw-w64-gcc/sr=
c=3D/usr/src/debug/mingw-w64-gcc=