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From: "knoepfel at fnal dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/111685] New: Segfault while sorting on array element
 address
Date: Tue, 03 Oct 2023 18:57:40 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: knoepfel at fnal dot gov
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111685

            Bug ID: 111685
           Summary: Segfault while sorting on array element address
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: knoepfel at fnal dot gov
  Target Milestone: ---

The following file (`sort-bug.cpp`) results in a segmentation violation:

```
#include <algorithm>
#include <array>
#include <cassert>
#include <vector>

int main()
{
  std::vector vnums{1, 5, 4};
  std::array anums{1, 5, 4};
  int nums[] =3D {1, 5, 4};

  auto cmp =3D [](auto&& a, auto&& b) { return &a < &b; };

  std::sort(vnums.begin(), vnums.end(), cmp);
  std::sort(anums.begin(), anums.end(), cmp); // segfault
  std::sort(nums, nums + 3, cmp);             // segfault
}
```

*Expected result*: the `vnums`, `anums`, and `nums` variables remain unalte=
red
after the invocation to `std::sort`.

*Compiler info*:

- Target: x86_64-pc-linux-gnu
- Configured with:
/scratch/workspace/art-build-base/v13_02_00-e28/SLF7/build/gcc/v13_1_0/src/=
gcc-13.1.0/configure
--enable-__cxa_atexit --enable-checking=3Drelease
--enable-compressed-debug-sections=3Dall
--enable-languages=3Dc,c++,fortran,go,objc,obj-c++ --enable-libstdcxx-time=
=3Drt
--enable-plugin --enable-stage1-checking=3Dall --enable-threads=3Dposix
--prefix=3D/scratch/workspace/art-build-base/v13_02_00-e28/SLF7/build/gcc/v=
13_1_0/Linux64bit+3.10-2.17
--with-system-zlib --enable-lto --with-zstd --enable-link-serialization=3D15
- Thread model: posix
- Supported LTO compression algorithms: zlib zstd
- gcc version 13.1.0 (GCC)=20

*Compiler/runtime command*: `g++ sort-bug.cpp -o sort-bug -std=3Dc++20 -ped=
antic
-Werror -Wall; ./sort-bug`=