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

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Message-ID: <542E2D56.6090007@oracle.com>
Date:	Fri, 03 Oct 2014 01:00:06 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Hugh Dickins <hughd@...gle.com>, Dave Jones <davej@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: pipe/page fault oddness.

On 10/02/2014 12:10 PM, Linus Torvalds wrote:
> On Thu, Oct 2, 2014 at 8:04 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
>> >
>> > I have a new one for you. I know it doesn't say "numa" anywhere, but I
>> > haven't ever seen that trace before so I'll just go ahead and blame it
>> > on your patch...
> Fair enough, but the oops doesn't really give even a hint of what
> could be wrong.
> 
> The stack is clearly too deep:
> 
>   Thread overran stack, or stack corrupted
>   task.ti: ffff880dba2ec000
>     RSP: ffff880dba2ebf48
> 
> but my patch shouldn't have added any deeper call-chains anywhere.

For the record, I tweaked the environment to put some more pressure on the
scheduler and found out what broke (which is not related to this thread at
all).

For the curious ones: https://lkml.org/lkml/2014/10/3/5


Thanks,
Sasha
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