On Wed, Aug 1, 2012 at 8:31 PM, Fan Du <fdu@xxxxxxxxxxxxx> 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/
