To reproduce:

* Install fresh Fedora 34 VM
* Compile Bitcoin Core and run `./test/functional/p2p_dns_seeds.py`
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif 
#include <util/syscall_sandbox.h>
#if defined(USE_SYSCALL_SANDBOX)
#include <array>
#include <cassert>
#include <cstdint>
#include <exception>
#include <map>
#include <new>
#include <set>
#include <string>
#include <vector>
#include <logging.h>
#include <tinyformat.h>
#include <util/threadnames.h>
#include <linux/audit.h>
#include <linux/filter.h>
#include <linux/seccomp.h>
#include <linux/unistd.h>
#include <signal.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <unistd.h>
namespace {
bool g_syscall_sandbox_enabled{false};