GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
自己在centos上想升级glib，下载源码make install之后，不能用，又yum install gettext，之后系统大部分命令都不能执行了，全部报这个错误：
lib64/libpthread.so.0: symbol __libc_dl_error_tsd, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
比如grep：
grep: relocation error: /lib64/libpthread.so.0: symbol __libc_dl_error_tsd, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
mkdir: relocation error: /lib64/libpthread.so.0: symbol __libc_dl_error_tsd, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
/usr/bin/python3: relocation error: /lib64/libpthread.so.0: symbol __libc_dl_error_tsd, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
ls,ps,grep这些基本命令都不能用了
貌似只有内核自带的命令能用，看起来是系统坏了
此时千万不要断开ssh连接（断开就连不上了，需要接触到服务器，才能进行后续补救的措施）
更不要重启，重启就开不开机了
先用head查看lib64里面现有版本有哪些:
head /usr/lib64/ld*.so
head /usr/lib64/libc-*
返回
==> /usr/lib64/ld-2.17.so <==
ELF > @
==> /usr/lib64/ld-2.25.so <==
ELF > � @ �1
==> /usr/lib64/libc-2.17.so <==
ELF > `& @ p� @ 8
==> /usr/lib64/libc-2.25.so <==
ELF > @ Û @ 8
说明存在2.25和2.17两个版本，由于我是相当于升级了ld版本，所以原来的是2.17
重新链接回到2.17版本，并测试ps能不能用：
sln /usr/lib64/ld-2.17.so /usr/lib64/ld-linux-x86-64.so.2
sln /usr/lib64/libc-2.17.so /usr/lib64/libc.so.6
ps
# 返回：
PID TTY TIME CMD
1 ? 14:01:50 systemd
2 ? 00:05:22 kthreadd
4 ? 00:00:00 kworker/0:0H
6 ? 01:53:51 ksoftirqd/0
7 ? 00:02:25 migration/0
8 ? 00:00:00 rcu_bh
到这里说明解决方案得到了验证,后续的测试发现python，sshd，supervisor还不能用，有报错：
/usr/bin/python3: relocation error: /lib64/libdl.so.2: symbol _dl_catch_error, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
virtualenvwrapper.sh: There was a problem running the initialization hooks.
检查目录，看下在新增/usr/lib64/ld-2.25.so那个时间点，哪些文件链接被改变了，就改回去
$ ls -lh /lib64/| grep '14 10:58'
drwxr-xr-x. 2 root root 4.0K Aug 14 10:58 gettext
lrwxrwxrwx. 1 root root 20 Aug 14 10:58 libasprintf.so.0 -> libasprintf.so.0.0.0
lrwxrwxrwx. 1 root root 21 Aug 14 10:58 libcroco-0.6.so.3 -> libcroco-0.6.so.3.0.1
lrwxrwxrwx. 1 root root 21 Aug 14 10:58 libgettextpo.so.0 -> libgettextpo.so.0.5.4
lrwxrwxrwx. 1 root root 12 Aug 14 10:58 libm.so.6 -> libm-2.25.so
经过比对
后来又改回了这三个链接到2.17
sln /lib64/libdl-2.17.so /lib64/libdl.so.2
sln /lib64/libBrokenLocale-2.17.so /lib64/libBrokenLocale.so.1
sln /lib64/libm-2.17.so /lib64/libm.so.6
总结一共改回了这些，具体要根据自己的情况改
sln /usr/lib64/ld-2.17.so /usr/lib64/ld-linux-x86-64.so.2
sln /usr/lib64/libc-2.17.so /usr/lib64/libc.so.6
sln /lib64/libdl-2.17.so /lib64/libdl.so.2
sln /lib64/libBrokenLocale-2.17.so /lib64/libBrokenLocale.so.1
sln /lib64/libm-2.17.so /lib64/libm.so.6