执行 ls / 命令时,系统卡死, ctrl+c 也不能结束
此问题一般都是因为mount 对端服务失效,本地目录卡死造成

首先使用 命令跟踪, 查看执行到哪一步卡死:
# strace ls /
.. lgetxattr("/MegaSAS.log", "system.posix_acl_default", 0x0, 0) = -1 ENODATA (No data available) lstat("/net", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 lgetxattr("/net", "security.selinux", 0x258f850, 255) = -1 EOPNOTSUPP (Operation not supported) lstat("/net", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 lgetxattr("/net", "system.posix_acl_access", 0x0, 0) = -1 EOPNOTSUPP (Operation not supported) lstat("/chaichuan_test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lgetxattr("/chaichuan_test", "security.selinux", 0x258f850, 255) = -1 ENODATA (No data available) lstat("/chaichuan_test", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 lgetxattr("/chaichuan_test", "system.posix_acl_access", 0x0, 0) = -1 ENODATA (No data available) lgetxattr("/chaichuan_test", "system.posix_acl_default", 0x0, 0) = -1 ENODATA (No data available) lstat("/mnt", {st_mode=S_IFDIR|0775, st_size=4096, ...}) = 0 lgetxattr("/mnt",
可以看到,命令执行到 /mnt这个目录时,停止不动了
也可以使用cat /proc/mounts 查看当前mount状态,发现确实有对mnt目录的记录
# cat /proc/mounts
192.168.10.150:/opt/ /mnt nfs4 ....
2. fuser 查看问题目录进程
问题定位/mnt目录,使用fuser 查看此目录占用进程
fuser -m /mnt
无法获取 /proc/4110/fd/255 的文件状态: 失效文件句柄
无法获取 /proc/9492/fd/255 的文件状态: 失效文件句柄
无法获取 /proc/29965/fd/255 的文件状态: 失效文件句柄
3.kill 解决
找到进程号直接kill
# kill -9 4110
# kill -9 9492
# kill -9 29965
问题解决
strace命令是一个集诊断、调试、统计与一体的工具,我们可以使用strace对应用的系统调用和信号传递的跟踪结果来对应用进行分析,以达到解决问题或者是了解应用工作过程的目的, 具体使用可以查看帮助.
此教程来自固定链接:http://www.rakbuluo.com/p26
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