To reproduce:

* Install fresh Fedora 34 VM
* Compile Bitcoin Core and run `./test/functional/p2p_dns_seeds.py`
{__NR_lsetxattr, "lsetxattr"},
    {__NR_lstat, "lstat"},
    {__NR_madvise, "madvise"},
    {__NR_mbind, "mbind"},
    {__NR_membarrier, "membarrier"},
    {__NR_memfd_create, "memfd_create"},
    {__NR_migrate_pages, "migrate_pages"},
    {__NR_mincore, "mincore"},
    {__NR_mkdir, "mkdir"},
    {__NR_mkdirat, "mkdirat"},
    {__NR_mknod, "mknod"},
    {__NR_mknodat, "mknodat"},
    {__NR_mlock, "mlock"},
    {__NR_mlock2, "mlock2"},
    {__NR_mlockall, "mlockall"},
    {__NR_mmap, "mmap"},
    {__NR_modify_ldt, "modify_ldt"},
    {__NR_mount, "mount"},
    {__NR_move_pages, "move_pages"},
    {__NR_mprotect, "mprotect"},
    {__NR_mq_getsetattr, "mq_getsetattr"},
    {__NR_mq_notify, "mq_notify"},
    {__NR_mq_open, "mq_open"},
    {__NR_mq_timedreceive, "mq_timedreceive"},
    {__NR_mq_timedsend, "mq_timedsend"},
    {__NR_mq_unlink, "mq_unlink"},
    {__NR_mremap, "mremap"},
    {__NR_msgctl, "msgctl"},
    {__NR_msgget, "msgget"},
    {__NR_msgrcv, "msgrcv"},