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For virtual filesystems like proc or sysfs there's another possibility for such files to appear. It's the removal of the object represented of a file on this FS. In particular, if we open some file in /proc/$pid and the respective task dies the path of the opened file would get removed, while the file itself would be still alive (though reporting ENOENT error on any attempts to read from one).
For virtual filesystems like proc or sysfs there's another possibility for such files to appear. It's the removal of the object represented of a file on this FS. In particular, if we open some file in /proc/$pid and the respective task dies the path of the opened file would get removed, while the file itself would be still alive (though reporting ENOENT error on any attempts to read from one).
=== Name-less files ===
There's a third possibility for a file not to have a visible name. But this is another story, that has nothing to do with dumping opened files, this it's described in a [[How to open a file without open system call|another article]].
== What CRIU does about it ==
== What CRIU does about it ==