netdev - Re: [run_timer_softirq] BUG: unable to handle kernel paging request at 0000000000010007

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Date:   Mon, 30 Oct 2017 21:37:10 +0100
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Network Development <netdev@...r.kernel.org>,
        Linux Wireless List <linux-wireless@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [run_timer_softirq] BUG: unable to handle kernel paging request
 at 0000000000010007

On Mon, Oct 30, 2017 at 12:29:47PM -0700, Linus Torvalds wrote:
>On Sun, Oct 29, 2017 at 4:48 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
>>
>> Here are 3 dmesgs related to wireless and 1 from ethernet.
>
>Fengguang, these would be lovelier still _if_ you have DEBUG_INFO
>enabled on the kernel, and your script were to find things like
>"symbol+0xhex/0xhex", and run "./scripts/faddr2line" on them.
>
>So
>
>> [  235.425464] BUG: unable to handle kernel paging request at 0000000000010007
>> [  235.425470] IP: run_timer_softirq+0x13a/0x470
>
>would also then have
>
>   run_timer_softirq at timer.c:XYZ
>
>which would make it easier to see exactly _what_ it is that faults. As
>it is, I think there's a fair number of inlining that makes it hard to
>see the cause, but that faddrtoline would make very obvious.

Good idea and tips! It'll definitely help debug the issues where
bisect cannot help.

>Finding that "symbol+xyz/abc" pattern should be fairly easy to
>automate, and should fit the 0day model fairly well. No?

Sure. We'll add DEBUG_INFO and automate faddr2line.

Regards,
Fengguang