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

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Message-ID: <542D65E9.7020207@oracle.com>
Date:	Thu, 02 Oct 2014 10:49:13 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Chuck Ebbert <cebbert.lkml@...il.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: pipe/page fault oddness.

On 10/02/2014 04:03 AM, Chuck Ebbert wrote:
> 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.

Ah, the actual content? That's a good point - let me look into that.


Thanks,
Sasha

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