linux-kernel - Re: pipe/page fault oddness.

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Message-ID: <20141002030300.1d2788ca@as>
Date:	Thu, 2 Oct 2014 03:03:00 -0500
From:	Chuck Ebbert <cebbert.lkml@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: pipe/page fault oddness.

On Wed, 01 Oct 2014 23:32:15 -0400
Sasha Levin <sasha.levin@...cle.com> wrote:

> On 10/01/2014 06:28 PM, Chuck Ebbert wrote:
> > On Wed, 01 Oct 2014 18:08:30 -0400
> > Sasha Levin <sasha.levin@...cle.com> wrote:
> > 
> >> > On 10/01/2014 04:20 PM, Linus Torvalds wrote:
> >>> > > So I'm really sending this patch out in the hope that it will get
> >>> > > comments, fixup and possibly even testing by people who actually know
> >>> > > the NUMA balancing code. Rik?  Anybody?
> >> > 
> >> > Hi Linus,
> >> > 
> >> > I've tried this patch on the same configuration that was triggering
> >> > the VM_BUG_ON that Hugh mentioned previously. Surprisingly enough it
> >> > ran fine for ~20 minutes before exploding with:
> >> > 
> >> > [ 2781.566206] kernel BUG at mm/huge_memory.c:1293!
> > That's:
> > 	BUG_ON(is_huge_zero_page(page));
> > 
> > Can you change your scripts to show the source code line when
> > the error is a BUG_ON()? The machine code disassembly after the
> > oops message doesn't really help.
> > 
> 
> Hum? The source code line is the first line in the trace:
> 
> 	[ 2781.566206] kernel BUG at mm/huge_memory.c:1293!
> 

I meant, display the contents of that line so we can see what the
BUG_ON() was triggered by. In some cases you might have a custom patch
applied or be running a version that some people don't have handy.
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