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Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60

From Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups linux.kernel
Subject Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60
Date 2016-11-02 16:00 +0100
Message-ID <sz5bc-7Ce-15@gated-at.bofh.it> (permalink)
References <snagn-54E-9@gated-at.bofh.it> <snagn-54E-23@gated-at.bofh.it> <syIoi-1st-5@gated-at.bofh.it> <syQYx-6Tf-1@gated-at.bofh.it> <sz1qV-59H-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Wed, Nov 2, 2016 at 4:50 AM, Tetsuo Handa
<penguin-kernel@i-love.sakura.ne.jp> wrote:
>>
>> So I _think_ the fix is to just remove this. Perhaps something like
>> the attached? Adding scheduler people since this is in their code..
>
> That is not sufficient, for another Oops occurs inside stack_not_used().
> Since I don't want to break stack_not_used(), can we tolerate nested
> try_get_task_stack() usage and protect the whole sched_show_task()?

Sure, looks good to me.

But as Andy says, we should probably apply my patch too, just to get
rid of the useless hex printk and the ugly ifdeffery.

PeterZ/Ingo?

                Linus

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[4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2016-11-01 15:40 +0100
  Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-02 00:50 +0100
    Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2016-11-02 12:00 +0100
      Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Andy Lutomirski <luto@amacapital.net> - 2016-11-02 15:10 +0100
      Re: [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-02 16:00 +0100
        Re: [4.9-rc3] BUG: unable to handle kernel paging request at  ffffc900144dfc60 Ingo Molnar <mingo@kernel.org> - 2016-11-03 07:40 +0100
      [tip:sched/urgent] sched/core: Fix oops in sched_show_task() tip-bot for Tetsuo Handa <tipbot@zytor.com> - 2016-11-03 08:20 +0100
    [tip:sched/urgent] sched/core: Remove pointless printout in  sched_show_task() tip-bot for Linus Torvalds <tipbot@zytor.com> - 2016-11-03 08:20 +0100

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