[ccache] Bug? ccache: error: Could not stat <cache file> (permission denied when creating?): No such file or directory

[Michael Ellerman]

On Sun, 2013-01-06 at 17:43 +0100, Joel Rosdahl wrote:
> On 7 December 2012 03:51, Michael Ellerman <michael at ellerman.id.au> wrote:
> > [...]
> > The error we see is like:
> >
> >         ccache: error: Could not stat /scratch/kisskb/ccache/0/d/01dfc7d17f46f8d9b361ba9323e8c9-1921690.o.tmp.stdout.Sprygo.8282
> >         (permission denied when creating?): No such file or directory
> > [...]
> > So basically 11295 is running cleanup_dir() and deleting files that are
> > still being written to. The full log shows 11295 deleting lots of files.
> >
> > From a brief look at the code I don't see any logic which would prevent
> > this from happening, other than that usually there is enough space in
> > the cache so that only old files are deleted.
> >
> > I'm not sure what the best way to avoid this is. The old logic of
> > noticing the stdout is missing and calling failed() at least doesn't
> > break the build.
> 
> Thanks for the bug report and analysis!
> 
> I have addressed the issue by detecting failure to create the
> temporary stdout/stderr files earlier so that no fatal() call is
> needed for the cleanup scenario. The fix will be included in v3.1.9.

Thanks Joel.

I'll give it a test in the next week or so.

Obviously we also need to make our cache bigger, but I'll hold off doing
that until I've confirmed your fix works.

cheers