bug#13149: 24.3.50; Emacs thinks file was changed outside Emacs, but it was not

[Paul Eggert]

On 01/17/2013 09:10 PM, Dmitry Gutov wrote:
> cifs:
> 
> 1358485764.638001400 fstat
> 1358485764.638001400 lstat
> 1358485764.638001400 stat
> *
> 1358485764.638001400 fstat
> 1358485764.638001400 lstat
> 1358485764.638001400 stat

That looks busted, since there's
a 10 ms sleep followed by a write at the two
points I marked "*" above, which means that
fstat, lstat, and stat are all wrong after the "*".
There's a similar problem with your vboxsf output.
ext4 looks OK.

I see that there is a known bug about Samba and 'write'
and st_mtime; see <https://bugzilla.samba.org/show_bug.cgi?id=6925>.
Could this be the bug you're running into, with cifs?

If you change the sleep to 100 ms, does that fix
the above behavior?  How about 1 second?  2 seconds?