To reproduce:

* Install fresh Fedora 34 VM
* Compile Bitcoin Core and run `./test/functional/p2p_dns_seeds.py`
bool g_syscall_sandbox_log_violation_before_terminating{false};
#if !defined(__x86_64__)
#error Syscall sandbox is an experimental feature currently available only under Linux x86-64.
#endif 
#ifndef SECCOMP_RET_KILL_PROCESS
#define SECCOMP_RET_KILL_PROCESS 0x80000000U
#endif
#ifndef __NR_statx
#define __NR_statx 332
#endif
#ifndef __NR_getrandom
#define __NR_getrandom 318
#endif
#ifndef __NR_membarrier
#define __NR_membarrier 324
#endif
const std::map<uint32_t, std::string> LINUX_SYSCALLS{
    {__NR_accept, "accept"},
    {__NR_accept4, "accept4"},
    {__NR_access, "access"},
    {__NR_acct, "acct"},
    {__NR_add_key, "add_key"},
    {__NR_adjtimex, "adjtimex"},
    {__NR_afs_syscall, "afs_syscall"},
    {__NR_alarm, "alarm"},
    {__NR_arch_prctl, "arch_prctl"},
    {__NR_bind, "bind"},
    {__NR_bpf, "bpf"},
    {__NR_brk, "brk"},
    {__NR_capget, "capget"},