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Date:   Fri, 12 Feb 2021 20:18:11 +0900
From:   Tetsuo Handa <>
To:     Michal Hocko <>,
        Matthew Wilcox <>
Cc:     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 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.

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