这样的报错还是第一次遇到，排查过程没有头绪，一直纠结在child setpgid这个地方，还好在google过程中看到有人在设置selinux的时候的相关案例，于是想到从这方面入手。
原因为selinux开启导致的，但是比较诡异的是从别的terminal ssh 跳转过去之后无法执行任何操作，包括配置selinux，后来还是从后台远程管理口登陆上去之后设置并重启，彻底解决这个问题。
-bash-4.3# ls
-bash: child setpgid (16790 to 16790): Permission denied
ls: cannot access RHEL6.2-20111117.0-Server-ppc64-DVD1.iso: Permission denied
ls: cannot access rhel-server-6.2-x86_64-dvd.iso: Permission denied
ls: cannot access install.log.syslog: Permission denied
ls: cannot access anaconda-ks.cfg: Permission denied
ls: cannot access install.log: Permission denied
anaconda-ks.cfg Documents install.log Music Public rhel-server-6.2-x86_64-dvd.iso Videos
Desktop Downloads install.log.syslog Pictures RHEL6.2-20111117.0-Server-ppc64-DVD1.iso Templates
-bash-4.3# su - streamsadmin
-bash: child setpgid (16792 to 16792): Permission denied
-bash: su: command not found
-bash-4.3# top
-bash: child setpgid (16793 to 16793): Permission denied
top: failed tty set: Input/output error
-bash-4.3# free -m
-bash: child setpgid (16794 to 16794): Permission denied
total used free shared buffers cached
Mem: 129045 18018 111026 0 227 15605
-/+ buffers/cache: 2186 126859
Swap: 10239 0 10239
-bash-4.3# cat .bash_profile
-bash: child setpgid (16796 to 16796): Permission denied
cat: .bash_profile: Permission denied
-bash-4.3# ls -l
-bash: child setpgid (16803 to 16803): Permission denied
ls: cannot access RHEL6.2-20111117.0-Server-ppc64-DVD1.iso: Permission denied
ls: cannot access rhel-server-6.2-x86_64-dvd.iso: Permission denied
ls: cannot access install.log.syslog: Permission denied
ls: cannot access anaconda-ks.cfg: Permission denied
ls: cannot access install.log: Permission denied
total 32
anaconda-ks.cfg
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Desktop
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Documents
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Downloads
install.log
install.log.syslog
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Music
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Pictures
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Public
RHEL6.2-20111117.0-Server-ppc64-DVD1.iso
rhel-server-6.2-x86_64-dvd.iso
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Templates
drwxr-xr-x. 2 root root 4096 Dec 18 22:43 Videos
-bash-4.3#
-EOF-