linux-kernel - Re: [PATCH] MIPS: oops when show backtrace of all active cpu

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Message-ID: <CAJiQ=7Abc2sR2E2FXmeTr_Hc+CWH+J25=juB3wL172Tn6-PYuA@mail.gmail.com>
Date:	Wed, 1 Aug 2012 21:18:28 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	Fan Du <fdu@...driver.com>
Cc:	ralf@...ux-mips.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org,
	vincent wen <vincentwenlinux@...il.com>
Subject: Re: [PATCH] MIPS: oops when show backtrace of all active cpu

On Wed, Aug 1, 2012 at 8:31 PM, Fan Du <fdu@...driver.com> wrote:
> show_backtrace must have an valid task when calling unwind_stack,
> so fix it by checking first.
[...]
> --- a/arch/mips/kernel/traps.c
> +++ b/arch/mips/kernel/traps.c
> @@ -151,6 +151,10 @@ static void show_backtrace(struct task_struct *task, const struct pt_regs *regs)
>                 show_raw_backtrace(sp);
>                 return;
>         }
> +
> +       if (task == NULL)
> +               task = current;
> +
>         printk("Call Trace:\n");
>         do {
>                 print_ip_sym(pc);

FYI, a slightly different version of this change was accepted:

https://patchwork.linux-mips.org/patch/3524/
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