nnheader-directory-files-is-safe

nnheader-directory-files-is-safe is a variable defined in `nnheader.el'.
Its value is

t

Documentation:
If non-nil, Gnus believes `directory-files' is safe.
It has been reported numerous times that `directory-files' fails with
an alarming frequency on NFS mounted file systems. If it is nil,
`nnheader-directory-files-safe' is used.