Bitcoin Core compiled with Ubuntu Focal gcc-8 immediately segfaults #27487

Is there an existing issue for this?

• I have searched the existing issues

Current behaviour

segfault

Expected behaviour

no segfault

Steps to reproduce

• Fresh install of Ubuntu Focal
• export DEBIAN_FRONTEND=noninteractive && apt update && apt install curl wget htop git vim ccache -y && git clone https://github.com/bitcoin/bitcoin.git --depth=1 ./bitcoin-core && cd bitcoin-core && apt install build-essential libtool autotools-dev automake pkg-config bsdmainutils python3-zmq libevent-dev libboost-dev gcc-8 g++-8 -y
• ./autogen.sh && ./configure CC=gcc-8 CXX=g++-8 && make -j $(nproc) src/bitcoind
• valgrind ./src/bitcoind

Relevant log output

# valgrind ./src/bitcoind 
==19993== Memcheck, a memory error detector
==19993== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==19993== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==19993== Command: ./src/bitcoind
==19993== 
==19993== Invalid read of size 8
==19993==    at 0x1FD15F: ~vector (stl_vector.h:567)
==19993==    by 0x1FD15F: std::filesystem::__cxx11::path::~path() (fs_path.h:209)
==19993==    by 0x1FD18B: ~_Cmpt (fs_path.h:644)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt> (stl_construct.h:98)
==19993==    by 0x1FD18B: __destroy<std::filesystem::__cxx11::path::_Cmpt*> (stl_construct.h:108)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt*> (stl_construct.h:137)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt*, std::filesystem::__cxx11::path::_Cmpt> (stl_construct.h:206)
==19993==    by 0x1FD18B: ~vector (stl_vector.h:567)
==19993==    by 0x1FD18B: std::filesystem::__cxx11::path::~path() (fs_path.h:209)
==19993==    by 0x1C5A7C: ~path (fs.h:30)
==19993==    by 0x1C5A7C: ArgsManager::GetConfigFilePath() const [clone .cold.494] (system.cpp:838)
==19993==    by 0x6057E0: ArgsManager::ReadConfigFiles(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool) (system.cpp:849)
==19993==    by 0x4F557F: common::InitConfig(ArgsManager&, std::function<bool (bilingual_str const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)>) (init.cpp:24)
==19993==    by 0x1CC16E: AppInit (bitcoind.cpp:155)
==19993==    by 0x1CC16E: main (bitcoind.cpp:266)
==19993==  Address 0x2b is not stack'd, malloc'd or (recently) free'd
==19993== 
==19993== 
==19993== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==19993==  Access not within mapped region at address 0x2B
==19993==    at 0x1FD15F: ~vector (stl_vector.h:567)
==19993==    by 0x1FD15F: std::filesystem::__cxx11::path::~path() (fs_path.h:209)
==19993==    by 0x1FD18B: ~_Cmpt (fs_path.h:644)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt> (stl_construct.h:98)
==19993==    by 0x1FD18B: __destroy<std::filesystem::__cxx11::path::_Cmpt*> (stl_construct.h:108)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt*> (stl_construct.h:137)
==19993==    by 0x1FD18B: _Destroy<std::filesystem::__cxx11::path::_Cmpt*, std::filesystem::__cxx11::path::_Cmpt> (stl_construct.h:206)
==19993==    by 0x1FD18B: ~vector (stl_vector.h:567)
==19993==    by 0x1FD18B: std::filesystem::__cxx11::path::~path() (fs_path.h:209)
==19993==    by 0x1C5A7C: ~path (fs.h:30)
==19993==    by 0x1C5A7C: ArgsManager::GetConfigFilePath() const [clone .cold.494] (system.cpp:838)
==19993==    by 0x6057E0: ArgsManager::ReadConfigFiles(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool) (system.cpp:849)
==19993==    by 0x4F557F: common::InitConfig(ArgsManager&, std::function<bool (bilingual_str const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&)>) (init.cpp:24)
==19993==    by 0x1CC16E: AppInit (bitcoind.cpp:155)
==19993==    by 0x1CC16E: main (bitcoind.cpp:266)
==19993==  If you believe this happened as a result of a stack
==19993==  overflow in your program's main thread (unlikely but
==19993==  possible), you can try to increase the size of the
==19993==  main thread stack using the --main-stacksize= flag.
==19993==  The main thread stack size used in this run was 8388608.
==19993== 
==19993== HEAP SUMMARY:
==19993==     in use at exit: 122,654 bytes in 1,182 blocks
==19993==   total heap usage: 2,545 allocs, 1,363 frees, 383,342 bytes allocated
==19993== 
==19993== LEAK SUMMARY:
==19993==    definitely lost: 0 bytes in 0 blocks
==19993==    indirectly lost: 0 bytes in 0 blocks
==19993==      possibly lost: 136 bytes in 1 blocks
==19993==    still reachable: 122,518 bytes in 1,181 blocks
==19993==         suppressed: 0 bytes in 0 blocks
==19993== Rerun with --leak-check=full to see details of leaked memory
==19993== 
==19993== For lists of detected and suppressed errors, rerun with: -s
==19993== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Segmentation fault (core dumped)


### How did you obtain Bitcoin Core

Compiled from source

### What version of Bitcoin Core are you using?

current master

### Operating system and version

-

### Machine specifications

_No response_

For reference, it seems to work on Debian Buster (https://packages.debian.org/buster/g++, 8.3) and CentOS 8 ( https://centos.pkgs.org/8/centos-appstream-x86_64/gcc-8.5.0-4.el8_5.x86_64.rpm.html, 8.5). Focal is on 8.4 (https://packages.ubuntu.com/focal/g++-8)

Need to double check, but iirc this is due to an issue with the libstdc++ shipped with Focal being incompatible with GCC 8 (for some std::filesystem usage), becuase it's actually from GCC 9.

Thanks