From: Oleg Nesterov <oleg@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>, Tejun Heo <tj@kernel.org>,
LKP <lkp@01.org>, LKML <linux-kernel@vger.kernel.org>,
kernel test robot <xiaolong.ye@intel.com>
Subject: Re: kthread_stop insanity (Re: [[DEBUG] force] 2642458962: BUG: unable to handle kernel paging request at ffffc90000997f18)
Date: Wed, 29 Jun 2016 00:59:29 +0200 [thread overview]
Message-ID: <20160628225929.GB8591@redhat.com> (raw)
In-Reply-To: <CALCETrXdazkZznTX88EZLVGB-ZFUVEwGMxiGXvN7pPw0WGKoFQ@mail.gmail.com>
On 06/28, Andy Lutomirski wrote:
>
> On Tue, Jun 28, 2016 at 1:12 PM, Oleg Nesterov <oleg@redhat.com> wrote:
> >
> > So please forget unless you see another reason for this change.
> >
>
> But I might need to that anyway for procfs to read the the stack,
> right? Do you see another way to handle that case?
Well, we could use probe_kernel_text() and recheck tsk->stack != NULL
after this.
But,
> I'm thinking of adding:
>
> void *try_get_task_stack(struct task_struct *tsk);
> void put_task_stack(struct task_struct *tsk);
Yes, agreed, this looks better.
Oleg.
next prev parent reply other threads:[~2016-06-28 23:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-27 5:22 Andy Lutomirski
2016-06-27 8:28 ` Peter Zijlstra
2016-06-27 14:54 ` Oleg Nesterov
2016-06-27 15:44 ` Andy Lutomirski
2016-06-27 17:00 ` Oleg Nesterov
2016-06-28 18:58 ` Oleg Nesterov
2016-06-28 19:12 ` Andy Lutomirski
2016-06-28 20:12 ` Oleg Nesterov
2016-06-28 20:54 ` Andy Lutomirski
2016-06-28 21:14 ` Linus Torvalds
2016-06-28 21:18 ` Linus Torvalds
2016-06-28 21:21 ` Andy Lutomirski
2016-06-28 21:35 ` Linus Torvalds
2016-06-28 21:40 ` Linus Torvalds
2016-06-28 22:47 ` Oleg Nesterov
2016-06-28 22:59 ` Oleg Nesterov [this message]
2016-06-29 15:34 ` Andy Lutomirski
2016-06-29 18:03 ` [PATCH] kthread: to_live_kthread() needs try_get_task_stack() Oleg Nesterov
2016-06-29 18:28 ` kbuild test robot
2016-06-29 18:44 ` Oleg Nesterov
2016-06-29 18:51 ` kbuild test robot
2016-06-29 23:01 ` Andy Lutomirski
2016-06-29 23:33 ` kthread_stop insanity (Re: [[DEBUG] force] 2642458962: BUG: unable to handle kernel paging request at ffffc90000997f18) Andy Lutomirski
2016-06-27 17:16 ` Linus Torvalds
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