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Date:   Fri, 12 Feb 2021 12:22:07 +0000
From:   Matthew Wilcox <>
To:     Tetsuo Handa <>
Cc:     Michal Hocko <>, Jan Kara <>,
        Dmitry Vyukov <>,
        syzbot <>,
        Jan Kara <>,,
        LKML <>,
        syzkaller-bugs <>,
        Theodore Ts'o <>, Linux-MM <>
Subject: Re: possible deadlock in start_this_handle (2)

On Fri, Feb 12, 2021 at 08:18:11PM +0900, Tetsuo Handa wrote:
> On 2021/02/12 1:41, Michal Hocko wrote:
> > But I suspect we have drifted away from the original issue. I thought
> > that a simple check would help us narrow down this particular case and
> > somebody messing up from the IRQ context didn't sound like a completely
> > off.
> > 
>  From my experience at ,
> I think we can replace direct PF_* manipulation with macros which do not receive "struct task_struct *" argument.
> Since TASK_PFA_TEST()/TASK_PFA_SET()/TASK_PFA_CLEAR() are for manipulating PFA_* flags on a remote thread, we can
> define similar ones for manipulating PF_* flags on current thread. Then, auditing dangerous users becomes easier.

No, nobody is manipulating another task's GFP flags.

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