参考博客：
https://arstercz.com/centos7-系统-df-hang-问题处理说明/
追踪
strace df
关掉服务
systemctl stop systemd-binfmt.service
systemctl stop proc-sys-fs-binfmt_misc.automount
systemctl stop proc-sys-fs-binfmt_misc.mount
参考博客：
https://arstercz.com/centos7-系统-df-hang-问题处理说明/
strace df
关掉服务
systemctl stop systemd-binfmt.service
systemctl stop proc-sys-fs-binfmt_misc.automount
systemctl stop proc-sys-fs-binfmt_misc.mount