linux-kernel - Re: vma corruption in today's -git

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Date:	Tue, 29 Mar 2011 12:19:01 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: vma corruption in today's -git

On Tue, Mar 29, 2011 at 12:09 PM, Dave Jones <davej@...hat.com> wrote:
> Running a kernel that I built from a git pull from this afternoon,
> I ran a barrage of stress tests, including some of the new syscall fuzzing
> work that I've been working on.  Everything seemed just fine, except that
> after I had stopped running everything, loadavg was still at 6, with
> top showing kworker processes running at high % of cpu.
>
> I ran perf top, and got this ..
>
>  BUG: unable to handle kernel paging request at fffffffffffffff3
>  IP: [<ffffffff8118d3e9>] vma_stop.clone.3+0x18/0x33

Should be fixed by:

commit 76597cd31470fa130784c78fadb4dab2e624a723
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sun Mar 27 19:09:29 2011 -0700

    proc: fix oops on invalid /proc/<pid>/maps access

    When m_start returns an error, the seq_file logic will still call m_stop
    with that error entry, so we'd better make sure that we check it before
    using it as a vma.

    Introduced by commit ec6fd8a4355c ("report errors in /proc/*/*map*
    sanely"), which replaced NULL with various ERR_PTR() cases.

    (On ia64, you happen to get a unaligned fault instead of a page fault,
    since the address used is generally some random error code like -EPERM)

    Reported-by: Anca Emanuel <anca.emanuel@...il.com>
    Reported-by: Tony Luck <tony.luck@...el.com>
    Cc: Al Viro <viro@...iv.linux.org.uk>
    Cc: Américo Wang <xiyou.wangcong@...il.com>
    Cc: Stephen Wilson <wilsons@...rt.ca>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
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