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Date:   Sat, 22 Aug 2020 09:30:25 -0700
From:   Linus Torvalds <>
To:     Tetsuo Handa <>
Cc:     Al Viro <>,
        Andrea Arcangeli <>,
        syzbot <>,
        syzkaller-bugs <>,
        linux-fsdevel <>,
        Linux Kernel Mailing List <>,
        Dmitry Vyukov <>,
        Andrew Morton <>
Subject: Re: [RFC PATCH] pipe: make pipe_release() deferrable.

On Fri, Aug 21, 2020 at 9:35 PM Tetsuo Handa
<> wrote:
> Therefore, this patch tries to convert __pipe_lock() in pipe_release() to
> killable, by deferring to a workqueue context when __pipe_lock_killable()
> failed.

I don't think this is an improvement.

If somebody can delay the pipe unlock arbitrarily, you've now turned a
user-visible blocking operation into blocking a workqueue instead. So
it's still there, and now it possibly is much worse and blocks
system_wq instead.


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