[Bug binutils/32032] New: dwp segfaults on hello world binary

[top.gate9722 at fastmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=32032

            Bug ID: 32032
           Summary: dwp segfaults on hello world binary
           Product: binutils
           Version: 2.42
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: top.gate9722 at fastmail dot com
  Target Milestone: ---

Created attachment 15650
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15650&action=edit
Arch Linux failure for GCC

# Description

dwp segfaults when I try to run it on a binary that was compiled with `-g
-gsplit-dwarf`. Failure occurs on Arch Linux (native OS) and Ubuntu 20.04
(Docker image), with GCC and Clang.

# dwp info

Native

```
$ dwp --version
GNU dwp (GNU Binutils) 2.42.50.20240516
Copyright (C) 2024 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
```

Docker

```
$ dwp --version
GNU dwp (GNU Binutils for Ubuntu) 2.42
Copyright (C) 2024 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
```

# Patches

None.

# System info

Native

```
$ lsb_release -a
LSB Version:    n/a
Distributor ID: Arch
Description:    Arch Linux
Release:        rolling
Codename:       n/a
```

Docker

```
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 24.04 LTS
Release:        24.04
Codename:       noble
```

# Compiler info

Native GCC

```
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/cjdb/opt/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/cjdb/opt
--enable-languages=c,c++ --disable-nls --with-build-config=bootstrap-lto-lean
--disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240623 (experimental) (GCC)
```

Native Clang

```
$ clang -v
clang version 19.0.0git (https://github.com/llvm/llvm-project.git
81671fe0e21e25f31b8100297f829744e66df4bd)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/cjdb/opt/bin
Found candidate GCC installation:
/home/cjdb/opt/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.0
Selected GCC installation:
/home/cjdb/opt/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
```

Docker GCC

```
$ gcc -v       
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/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
14-20240412-0ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new
--enable-libstdcxx-backtrace --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-14-OQFzmN/gcc-14-14-20240412/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-OQFzmN/gcc-14-14-20240412/debian/tmp-gcn/usr
--enable-offload-defaulted --without-cuda-driver
--enable-checking=yes,extra,rtl --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.1 20240412 (experimental) [master r14-9935-g67e1433a94f]
(Ubuntu 14-20240412-0ubuntu1)
```

Docker Clang

```
$ clang -v
Ubuntu clang version 19.0.0
(++20240721081714+0caf0c93e759-1~exp1~20240721081828.299)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-19/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/14
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/14
Candidate multilib: .;@m64
Selected multilib: .;@m64
```

# Commands run

Native GCC

```
$ cat hello.cpp
#include <iostream>

int main()
{
  int a;
  std::cin >> a;
  std::cout << (a + 1) << '\n';
}
$ g++ -c -o hello.o hello.cpp -g -gsplit-dwarf
$ ls
hello.cpp  hello.dwo  hello.o
$ g++ -o hello hello.o
$ ./hello
10
11
$ dwp -e hello
Segmentation fault (core dumped)
```

Native Clang

```
$ rm hello hello.dwo hello.o
$ clang++ -c -o hello.o hello.cpp -g -gsplit-dwarf
$ clang++ -o hello hello.o
$ ls
hello  hello.cpp  hello.dwo  hello.o
$ ./hello
13
14
$ dwp -e hello
Segmentation fault (core dumped)
```

Docker GCC

```
$ g++ -c -o hello.o hello.cpp -g -gsplit-dwarf
$ g++ -o hello hello.o
$ ls
hello  hello.cpp  hello.dwo  hello.o
$ ./hello
10
11
$ dwp -e hello
Segmentation fault (core dumped)
```

Docker Clang

```
$ rm hello hello.dwo hello.o
$ clang++ -c -o hello.o hello.cpp -g -gsplit-dwarf
$ clang++ -o hello hello.o
$ ls
hello  hello.cpp  hello.dwo  hello.o
$ ./hello
13
14
$ dwp -e hello
Segmentation fault (core dumped)
```

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