linux-kernel - Re: Reading /proc/kcore causes a BUG()

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Message-ID: <20090904090039.GA25804@craig-wood.com>
Date:	Fri, 4 Sep 2009 10:00:39 +0100
From:	Nick Craig-Wood <nick@...ig-wood.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Reading /proc/kcore causes a BUG()

On Fri, Sep 04, 2009 at 09:06:42AM +0900, KAMEZAWA Hiroyuki wrote:
> On Thu, 3 Sep 2009 15:14:55 +0300
> Pekka Enberg <penberg@...helsinki.fi> wrote:
> > On Thu, Sep 3, 2009 at 2:34 PM, Nick Craig-Wood<nick@...ig-wood.com> wrote:
> > > Is a fix for this going to make 2.6.31?
> > >
> > > To replicate
> > >
> > >  cat /proc/kcore >/dev/null
> > >
> > > See also
> > >
> > >  http://bugzilla.kernel.org/show_bug.cgi?id=13850
[snip]
> > > I tried this on the latest git checkout (as of 2009-09-03 11:00 GMT)
> > > under Xen as a domU.  The bugzilla report states it happens on non xen
> > > machines also.
> > >
> > > I know reading /proc/kcore isn't such a good idea, but badly written
> > > backup scripts are triggering this on our customer's servers :-(
> > 
> > AFAICT the bug was fixed but I can't seem to find the patches in
> > Linus' git either. Lets CC Andrew and Hiroyuki-san.
> 
> Ah, it's now tested under mmotm. please wait.

I tried mmotm but I couldn't get it to boot under Xen :-(

If you send me a patch against latest git I'm willing to test it (I
tried to extract the relevant patch from mmotm but failed dismally)

Thanks

Nick
-- 
Nick Craig-Wood <nick@...ig-wood.com> -- http://www.craig-wood.com/nick
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