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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon, 12 Jun 2023 09:57:51 -0700
Message-ID: <CAHk-=wh0hrFjcU5C8uHvLBThrT5vQsFHb7Jk6HRP3LAJqdNx1A@mail.gmail.com>
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+)
To:     Jens Axboe <axboe@kernel.dk>
Cc:     "Darrick J. Wong" <djwong@kernel.org>,
        Dave Chinner <david@fromorbit.com>,
        Zorro Lang <zlang@redhat.com>, linux-xfs@vger.kernel.org,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Mike Christie <michael.christie@oracle.com>,
        "Michael S. Tsirkin" <mst@redhat.com>, linux-kernel@vger.kernel.org
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On Mon, Jun 12, 2023 at 9:45=E2=80=AFAM Jens Axboe <axboe@kernel.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 =3D kthread_data(tsk);
        struct io_wqe *wqe =3D worker->wqe;

back in the bad old days of kthreads.

But yeah, I don't know that code.

              Linus