cd .. wrong, what is the situation

  zhangys@hj03:/platform_soft/Interlocking/src/core$ cd ..
  cd: 获取当前目录时出错: getcwd: 无法访问父目录: 没有那个文件或目录
  zhangys@hj03:/platform_soft/Interlocking/src/core/..$ cd ..
  cd: 获取当前目录时出错: getcwd: 无法访问父目录: 没有那个文件或目录
  zhangys@hj03:/platform_soft/Interlocking/src/core/../..$ cd ..
  zhangys@hj03:/platform_soft$ ls
  cmake1  mytest  Old  Samba服务器构建步骤.docx  test  平台软件词汇表.xlsx
  zhangys@hj03:/platform_soft$
  

above cd .. why it went wrong , and never encountered it , the operating system is ubuntu12.04
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directory is deleted it
linux :/ home / mymtom / tmp $ mkdir-p foo / bar
linux :/ home / mymtom / tmp $ cd foo / bar
linux :/ home / mymtom / tmp / foo / bar $ rm-rf .. /.. / foo
linux :/ home / mymtom / tmp / foo / bar $ cd ..
cd: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory
linux :/ home / mymtom / tmp / foo / bar / .. $ pwd
/ home / smgview / tmp / foo / bar / ..
linux :/ home / mymtom / tmp / foo / bar / .. $
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father was too hard to kill the child , of course can not find the father the
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Great God let me suddenly, very grateful