kprobe:filemap_splice_read /comm == "copyfail_poc"/
{
    $in = (struct file *)arg0;
    $ppos = (loff_t *)arg1;
    printf("filemap_splice_read: pos=0x%llx ino=%lu\n",
           *$ppos, $in->f_inode->i_ino);
}

kprobe:splice_folio_into_pipe /comm == "copyfail_poc"/
{
    printf("splice_folio_into_pipe\n");
}