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Date: Sun, 27 Mar 2011 20:44:05 +0300
Message-ID: <AANLkTinXjEvvV+_E8soiT7zE09O_QT6Gfkh7CPh8mV=N@mail.gmail.com>
Subject: Re: BUG: unable to handle kernel paging request
From: Anca Emanuel <anca.emanuel@gmail.com>
To: =?ISO-8859-1?Q?Am=E9rico_Wang?= <xiyou.wangcong@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>, LKML <linux-kernel@vger.kernel.org>
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On Sun, Mar 27, 2011 at 7:00 PM, Am?rico Wang <xiyou.wangcong@gmail.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 Am?rico Wang !
Without it, I can reproduce the bug.
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