bug#55706: 29.0.50; files test fails about 20% of the time

[Michael Albinus]

Lars Ingebrigtsen <larsi@gnus.org> writes:

Hi Lars,

> I've now run a number of
>
> for i in `seq 1 40`; do make -j64 check; done > /tmp/j64.out 2>/tmp/j64.err
>
> variations, and it varies how much it fails.  With -j4 and lower, it
> never fails.  With j8 to j16 it fails about 1 in 10 times, and with -j32
> it fails 40% of the time.  (Take numbers with a grain of salt.)

I have less cores in my laptop, so I have applied your code with -j8. It
failed exactly one time. Not bad, so I'm able to reproduce it.

> So there seems to be something racing with this test -- but only this
> test.  Pretty bizarre.

I will instrument both the test function and file-in-directory-p in
order to get more information about the reason. Don't expect results
soon, these days I'm slow in working for Emacs.

Best regards, Michael.