linux-kernel - Re: BUG() in copy_fdtable() with 64K pages (2.6.19-rc1-mm1)

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Date:	Tue, 10 Oct 2006 18:05:23 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Vadim Lobanov <vlobanov@...akeasy.net>,
	Andrew Morton <akpm@...l.org>
Cc:	Olof Johansson <olof@...om.net>, Andrew Morton <akpm@...l.org>,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: BUG() in copy_fdtable() with 64K pages (2.6.19-rc1-mm1)

On Tue, Oct 10, 2006 at 01:31:11PM -0700, Vadim Lobanov wrote:
> On Tuesday 10 October 2006 13:20, Linas Vepstas wrote:
> > On Tue, Oct 10, 2006 at 12:15:19PM -0500, Olof Johansson wrote:
> > > I keep hitting this on -rc1-mm1. The system comes up but I can't login
> > > since login hits it.
> > >
> > > Bisect says that
> > > fdtable-implement-new-pagesize-based-fdtable-allocator.patch is at fault.
> > >
> > > CONFIG_PPC_64K_PAGES=y is required for it to fail, with 4K pages it's
> > > fine.
> > >
> > > (Hardware is a Quad G5, 1GB RAM, g5_defconfig + CONFIG_PPC_64K_PAGES,
> > > defaults on all new options)
> > >
> > > kernel BUG in copy_fdtable at fs/file.c:138!
> >
> > FWIW, I too was hitting this bug, during init:
> >
> > [   41.659823] Freeing unused kernel memory: 320k freed
> > INIT: version 2.86 bootin[   42.509322] kernel BUG in copy_fdtable at
> > fs/file.c:138!
> >
> > and of course systm does not come up.

I forgot to mention my h/w was completely different (a cell)

> I'm digging through this right now, trying to figure out exactly what went 
> wrong (and why some people are seeing this, while others are not). All the 
> code seems correct; another pair of eyes is always welcome though.

The patch that AKPM just posted at

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.19-rc1/2.6.19-rc1-mm1/hot-fixes/revert-fdtable-implement-new-pagesize-based-fdtable-allocator.patch

boots for me.

Thanks Andrew!

--linas
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