[Bug build/30157] parallel "make check" randomly skips tests

["vincent-srcware at vinc17 dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30157

--- Comment #12 from Vincent Lefèvre <vincent-srcware at vinc17 dot net> ---
(In reply to Carlos O'Donell from comment #11)
> (In reply to Vincent Lefèvre from comment #10)
> > I've done another "make check". So now there are tests whose last execution
> > is
> > * 2023-02-24 (today)
> > * 2023-02-23
> > * 2023-02-22 around 17:43
> > * 2023-02-22 around 17:12 (corresponding to the first "make check")
> > 
> > (No source files have been changed after the initial checkout.)
> 
> Just to be clear, while you say "No source files have been changed", what is
> actually important is *dependencies*.
> 
> In the case of tst-audit23 we have the following:
> 
> 2283 $(objpfx)tst-audit23.out: $(objpfx)tst-auditmod23.so \
> 2284                           $(objpfx)tst-audit23mod.so

The timestamps of these files:

-rwxr-xr-x 1 20080 2023-02-22 17:12:15 elf/tst-audit23mod.so*
-rwxr-xr-x 1 24632 2023-02-22 17:12:15 elf/tst-auditmod23.so*

(The timestamps of the elf/tst*.so files go from 2023-02-22 17:12:14 to
2023-02-22 17:12:23.)

So they still correspond to the first "make check".

> The tests need their output file (the *.out file) and this says that output
> needs the two audit modules compiled, so they get built before the test is
> built and run.
> 
> I would be curious to know if the *.out file was changed, or the *.so files
> were changed, since they are are of the set of dependencies for the test.

For the elf/*.out files:

cventin:...tware/glibc-build> ls -lgot **/elf/tst*.out
-rw-r--r-- 1     75 2023-02-23 15:32:36 elf/tst-glibc-hwcaps-cache.out
-rw-r--r-- 1     68 2023-02-23 15:32:36 elf/tst-glibc-hwcaps-2-cache.out
[...]
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-debug1.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit25a.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit25b.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit23.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit24a.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit24b.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit24c.out
-rw-r--r-- 1      0 2023-02-23 15:32:36 elf/tst-audit24d.out
-rw-r--r-- 1      9 2023-02-23 15:32:36 elf/tst-audit11.out
[...]
-rw-r--r-- 1      0 2023-02-23 15:32:35 elf/tst-dst-static.out
-rw-r--r-- 1     48 2023-02-22 17:12:25 elf/tst-dso-ordering9.out
-rw-r--r-- 1     48 2023-02-22 17:12:24 elf/tst-dso-ordering3.out
[...]
-rw-r--r-- 1      0 2023-02-22 17:12:18 elf/tst-relro-ldso.out
-rw-r--r-- 1      0 2023-02-22 17:12:14 elf/tst-glibcelf.out
-rw-r--r-- 1 160643 2023-02-22 17:12:12 elf/tst-ldconfig-p.out
-rw-r--r-- 1      0 2023-02-22 17:12:12 elf/tst-ldconfig-X.out

Since the tst*.out files were generated after their dependencies (built around
2023-02-22 17:12 in the first "make check"), I would have expected them not to
be rebuilt on 2023-02-23 (assuming that's how the glibc test rules work).

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