On Sun, Feb 11, 2018 at 11:32:03AM +0100, Ingo Molnar wrote:
>
> * Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> > On 2/10/18 7:14 AM, Tetsuo Handa wrote:
> > > Recently, we are seeing I/O hungup reports.
> > >
> > > I don't know whether a regression introduced by commit 50816c48997af857
> > > ("sched/wait: Standardize internal naming of wait-queue entries") is relevant.
> > > But shouldn't we backport commit c6b9d9a330290144 ("sched/wait: Fix
> > > add_wait_queue() behavioral change") to 4.13+ kernels anyway?
> >
> > Yes, it most certainly should!
>
> Indeed, the bug was introduced in v4.13 and the fix was included in v4.15, but
> it's missing from v4.13 and v4.14 - not sure how I missed that.
>
> The fix (also attached below) applies cleanly to both v4.13 and v4.14:
Now queued up, thanks.
greg k-h