linux-kernel - Re: BUG: unable to handle kernel paging request

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Date:	Sun, 27 Mar 2011 20:44:05 +0300
From:	Anca Emanuel <anca.emanuel@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: unable to handle kernel paging request

On Sun, Mar 27, 2011 at 7:00 PM, Américo Wang <xiyou.wangcong@...il.com> wrote:
> Exactly... should be fixed by something like:
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 7c708a4..6b82632 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -90,7 +90,7 @@ static void pad_len_spaces(struct seq_file *m, int len)
>
>  static void vma_stop(struct proc_maps_private *priv, struct
> vm_area_struct *vma)
>  {
> -       if (vma && vma != priv->tail_vma) {
> +       if (vma && !IS_ERR(vma) && vma != priv->tail_vma) {
>                struct mm_struct *mm = vma->vm_mm;
>                up_read(&mm->mmap_sem);
>                mmput(mm);
>

I tested the patch and works ok now. Thanks Américo Wang !
Without it, I can reproduce the bug.
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