Ominous gap in pmap’s output

I couldn’t help posting this link which is a must-read if one day you notice that there is something uncanny in the way pmap depicts memory layout of any process under Linux x86_64:

# pmap -x `echo $$`
28917:   -bash
Address           Kbytes     RSS    Anon  Locked Mode   Mapping
0000000000400000     712       -       -       - r-x--  bash
00000000006b2000      40       -       -       - rw---  bash
00000000006bc000      20       -       -       - rw---    [ anon ]
00000000008bb000      32       -       -       - rw---  bash
0000000002d5b000     368       -       -       - rw---    [ anon ]
00000030ffe00000     112       -       -       - r-x--  ld-2.5.so
000000310001b000       4       -       -       - r----  ld-2.5.so
000000310001c000       4       -       -       - rw---  ld-2.5.so
0000003100200000    1332       -       -       - r-x--  libc-2.5.so
000000310034d000    2048       -       -       - -----  libc-2.5.so
000000310054d000      16       -       -       - r----  libc-2.5.so
0000003100551000       4       -       -       - rw---  libc-2.5.so
0000003100552000      20       -       -       - rw---    [ anon ]
0000003100600000       8       -       -       - r-x--  libdl-2.5.so
0000003100602000    2048       -       -       - -----  libdl-2.5.so
0000003100802000       4       -       -       - r----  libdl-2.5.so
0000003100803000       4       -       -       - rw---  libdl-2.5.so
0000003100a00000      12       -       -       - r-x--  libtermcap.so.2.0.8
0000003100a03000    2044       -       -       - -----  libtermcap.so.2.0.8
0000003100c02000       4       -       -       - rw---  libtermcap.so.2.0.8
00002b04ab767000       4       -       -       - rw---    [ anon ]
00002b04ab771000      12       -       -       - rw---    [ anon ]
00002b04ab774000      40       -       -       - r-x--  libnss_files-2.5.so
00002b04ab77e000    2044       -       -       - -----  libnss_files-2.5.so
00002b04ab97d000       4       -       -       - r----  libnss_files-2.5.so
00002b04ab97e000       4       -       -       - rw---  libnss_files-2.5.so
00002b04ab97f000   55100       -       -       - r----  locale-archive
00002b04aef4e000      28       -       -       - r--s-  gconv-modules.cache
00002b04aef55000       4       -       -       - rw---    [ anon ]
00007fff393d2000      84       -       -       - rw---    [ stack ]
ffffffffff600000    8192       -       -       - -----    [ anon ]
----------------  ------  ------  ------  ------
total kB           74352       -       -       -

Once again, if you’re scratching your head immensely and trying to understand where those gaps came from just go here and find the answer to this riddle.