linux-kernel - Re: [BUGFIX] NULL pointer dereference in __vm_enough

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Message-ID: <20070812054831.GB8992@mail.ustc.edu.cn>
Date:	Sun, 12 Aug 2007 13:48:31 +0800
From:	WU Fengguang <wfg@...l.ustc.edu.cn>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUGFIX] NULL pointer dereference in __vm_enough_memory()

On Sat, Aug 11, 2007 at 11:31:09PM +0530, Balbir Singh wrote:
> Andrew Morton wrote:
> > On Sat, 11 Aug 2007 20:00:12 +0530 "Balbir Singh" <balbir@...ux.vnet.ibm.com> wrote:
> >>>
> >> Shouldn't we just not stop vm accounting for kernel threads?
> >>
> > 
> > Could be.  It'd help heaps if we knew which patch in -mm caused
> > this, but from a quick peek it seems to me that mainline should be
> > vulnerable as well.
> 
> Thats a valid point. It would be interesting to see what the overcommit
> setting was, when the panic occurred.

FYI, I do have nondefault overcommit settings:

vm.overcommit_memory = 2
vm.lowmem_reserve_ratio = 1 1

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