On Mon, 4 Jul 2016 16:16:55 +0200
Dominique Martinet <dominique.marti...@cea.fr> wrote:
> I *think* this introduces a race somewhere, I'm getting errors like:
> cat: f.05: No such file or directory
> cat: f.14: No such file or directory
> cat: f.13: No such file or directory
> cat: f.39: No such file or directory
> cat: f.05: No such file or directory
>
>
> when doing:
> for file in {01..50}; do touch f.${file}; done
> seq 1 1000 | xargs -n 1 -P 25 -I{} cat f.* > /dev/null
>
>
>
> I don't get it everytime but close enough to. Server is bi-socket and
> has some numa effects which help producing data-synchronization races,
> it's probably harder to hit on a laptop.
>
> I'm simply trying over a patched qemu for now, applied patches right on
> top of 4.6.1, can't seem to reproduce with a vanilla 4.6.1 without any
> change to qemu (still patched), so it looks kernel-side.
>
>
> Can't say I've taken much time to look at the patches yet though,
> sorry - I don't think it's too hard to debug though so I'll take a look
> tomorrow as soon as I find time if you haven't gotten it by then.
>
Hi Dominique !
Thanks a lot for your testing. I'll try to reproduce on my POWER8 system.
Cheers.
--
Greg
