tst-open-tmpfile and pre-3.18 kernels

[Florian Weimer]

On 01/02/2017 06:46 PM, Joseph Myers wrote:
> I'm observing a test failure
>
> FAIL: io/tst-open-tmpfile
>
> on a system with a 3.14 kernel.  This appears to correspond to a lack of
> the fix:
>
> commit 69a91c237ab0ebe4e9fdeaf6d0090c85275594ec
> Author: Eric Rannaud <e@nanocritical.com>
> Date:   Thu Oct 30 01:51:01 2014 -0700
>
>     fs: allow open(dir, O_TMPFILE|..., 0) with mode 0
>
> meaning I get
>
> error: openat ("/dev/shm", O_TMPFILE | O_RDWR): Permission denied
>
> in tst-open-tmpfile.out.
>
> Should we make the test also treat EACCES as meaning lack of O_TMPFILE
> support to allow for this kernel bug, or just document this on the release
> wiki page as a known cause of a test failure?

I'd suggest documenting it in the release notes.  Perhaps this test 
failure is a little bit of encouragement to backport the fix to 
supported kernels.

Thanks,
Florian