今日、私は自分のアップグレードをチェックアウトし、Debianテストで63のアップグレードを見ました。いいね。それらのほとんどが保留されているので、私は興味を持ったので、私-Vは以前バージョンを見ていた。驚いたことに、それらのほとんどは、+b1または+b2バージョンにアップグレードしています。いい子のようにapt-get changelog libc6（ええ、それは重要です）変更ログに+b1バージョンがないことを確認するだけです。では、これらのバージョンは何のためのものですか？
sudo apt-get -V upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
gdm3 (3.4.1-9 => 3.4.1-9+b1)
libalgorithm-diff-xs-perl (0.04-2+b2 => 0.04-2+b3)
libapt-pkg-perl (0.1.29 => 0.1.29+b1)
libcairo-perl (1.103-2 => 1.103-2+b1)
libclass-c3-xs-perl (0.13-1+b2 => 0.13-1+b3)
libclone-perl (0.34-1 => 0.34-1+b1)
libcrypt-blowfish-perl (2.14-1 => 2.14-1+b1)
libcrypt-openssl-bignum-perl (0.04-4 => 0.04-4+b1)
libcrypt-ssleay-perl (0.58-1 => 0.58-1+b1)
libdbd-mysql-perl (4.023-1 => 4.023-1+b1)
libdbi-perl (1.628-1 => 1.628-1+b1)
libdigest-crc-perl (0.18-1+b1 => 0.18-1+b2)
libdigest-md4-perl (1.9+dfsg-1 => 1.9+dfsg-1+b1)
libfile-fcntllock-perl (0.14-2 => 0.14-2+b1)
libfile-fnmatch-perl (0.02-1+b2 => 0.02-1+b3)
libglib-perl (1.301-1 => 1.301-1+b1)
libgtk2-perl (1.247-2 => 1.247-2+b1)
libhtml-parser-perl (3.71-1 => 3.71-1+b1)
libio-pty-perl (1.08-1+b2 => 1.08-1+b3)
libjson-xs-perl (2.340-1 => 2.340-1+b1)
liblist-moreutils-perl (0.33-1+b1 => 0.33-1+b2)
liblocale-gettext-perl (1.05-7+b1 => 1.05-7+b2)
libmath-bigint-gmp-perl (1.37-2 => 1.37-3)
libnet-dbus-perl (1.0.0-2 => 1.0.0-2+b1)
libnet-dns-perl (0.68-1.1 => 0.68-1.2)
libnet-pcap-perl (0.17-1 => 0.17-1+b1)
libnet-rawip-perl (0.25-1+b2 => 0.25-1+b3)
libnet-ssleay-perl (1.55-1 => 1.55-1+b2)
libpam-systemd (44-12 => 44-12+b1)
libpango-perl (1.224-2 => 1.224-2+b1)
libparams-util-perl (1.07-1 => 1.07-1+b1)
libpurple0 (2.10.7-2 => 2.10.7-2+b1)
libsocket-perl (2.011-1 => 2.011-1+b1)
libsocket6-perl (0.23-1+b2 => 0.23-1+b3)
libsub-name-perl (0.05-1+b2 => 0.05-1+b3)
libsvn1 (1.6.17dfsg-4.1+b1 => 1.7.9-1+nmu4)
libterm-readkey-perl (2.30-4+b2 => 2.30-4+b3)
libterm-readline-gnu-perl (1.20-2+b1 => 1.20-2+b2)
libtext-charwidth-perl (0.04-7+b1 => 0.04-7+b2)
libtext-iconv-perl (1.7-5 => 1.7-5+b1)
libuuid-perl (0.02-5 => 0.02-5+b1)
libxml-libxml-perl (2.0010+dfsg-1 => 2.0010+dfsg-1+b1)
libxml-parser-perl (2.41-1+b1 => 2.41-1+b2)
libyaml-libyaml-perl (0.38-3 => 0.38-3+b1)
perl (5.14.2-21 => 5.18.1-3)
perl-base (5.14.2-21 => 5.18.1-3)
perl-modules (5.14.2-21 => 5.18.1-3)
perl-tk (804.031-1 => 804.031-1+b1)
subversion (1.6.17dfsg-4.1+b1 => 1.7.9-1+nmu4)
systemd (44-12 => 44-12+b1)
vim (7.3.923-3 => 7.3.923-3+b1)
vim-common (7.3.923-3 => 7.3.923-3+b1)
vim-gtk (7.3.923-3 => 7.3.923-3+b1)
xchat (2.8.8-7.1 => 2.8.8-7.1+b1)
xserver-xorg-core (1.12.4-6.1 => 1.12.4-6.2+b1)
The following packages will be upgraded:
libc-dev-bin (2.17-92 => 2.17-92+b1)
libc6 (2.17-92 => 2.17-92+b1)
libc6-dbg (2.17-92 => 2.17-92+b1)
libc6-dev (2.17-92 => 2.17-92+b1)
libc6-i686 (2.17-92 => 2.17-92+b1)
apt-cache policy libc6
libc6:
Installed: 2.17-92
Candidate: 2.17-92+b1
Version table:
2.17-92+b1 0
500 http://ftp.us.debian.org/debian/ testing/main i386 Packages
500 http://http.debian.net/debian/ jessie/main i386 Packages
*** 2.17-92 0
100 /var/lib/dpkg/status
apt-get changelog libc6
eglibc (2.17-92) unstable; urgency=low
* kfreebsd/local-sysdeps.diff: update to revision 4839 (from glibc-bsd).
-- Petr Salinger <petr.salinger@seznam.cz> Wed, 31 Jul 2013 22:38:47 +0100
eglibc (2.17-91) unstable; urgency=low
[ Petr Salinger ]
* switch libpthread implementation on kfreebsd-* to fbtl.
Closes: #703545. Closes: #665287. Closes: #683825. Closes: #489066.
* split some parts of kfreebsd/local-linuxthreads29.diff
into kfreebsd/local-nscd-no-sockcloexec.diff and
kfreebsd/local-linuxthreads-tlsdesc.diff
* add kfreebsd/local-fbtl.diff and kfreebsd/local-fbtl-depends.diff
* kfreebsd/local-sysdeps.diff: update to revision 4809 (from glibc-bsd).
Closes: #718181. Addresses: #717032 in new binutils.
* update testsuite-checking/expected-results-*-kfreebsd-gnu-*
by fbtl tests that are known to fail.
(snip)