错误提示：使用adb命令时，显示：
CANNOT LINK EXECUTABLE: cannot locate symbol "__umask_chk" referenced by "/system/bin/sh"...
或者
CANNOT LINK EXECUTABLE: could not load library "libselinux.so" needed by "df"; caused by cannot locate symbol "__strchr_chk" referenced by "libselinux.so"...
等错误信息
原因：手动多挂载了/system文件系统分区
解决办法：在init.rc或者代码里将挂载/system分区的相关代码屏蔽掉或者停止手动挂载/system。