linux-kernel - Re: [6.5-rc5 regression] core dump hangs (was Re: [Bug report] fstests generic/051 (on xfs) hang on latest linux v6.5-rc5+)

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Date:   Mon, 12 Jun 2023 09:57:51 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     "Darrick J. Wong" <djwong@...nel.org>,
        Dave Chinner <david@...morbit.com>,
        Zorro Lang <zlang@...hat.com>, linux-xfs@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Mike Christie <michael.christie@...cle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [6.5-rc5 regression] core dump hangs (was Re: [Bug report]
 fstests generic/051 (on xfs) hang on latest linux v6.5-rc5+)

On Mon, Jun 12, 2023 at 9:45 AM Jens Axboe <axboe@...nel.dk> wrote:
>
> You snipped the suspicion in my reply on why that exists, to avoid
> io_wq_worker_sleeping() triggering.

I'm not seeing why triggering io_wq_worker_sleeping() should even be a
problem in the first place.

I suspect that is entirely historical too, and has to do with how it
used to do that

        struct io_worker *worker = kthread_data(tsk);
        struct io_wqe *wqe = worker->wqe;

back in the bad old days of kthreads.

But yeah, I don't know that code.

              Linus