From: Sasha Levin <sasha.levin@oracle.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mgorman@suse.de
Subject: Re: [PATCH 0/5] mm: poison critical mm/ structs
Date: Thu, 09 Oct 2014 15:11:39 -0400 [thread overview]
Message-ID: <5436DDEB.5090004@oracle.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1410020154500.6444@eggly.anvils>
On 10/02/2014 05:23 AM, Hugh Dickins wrote:
> I'm glad to hear they've confirmed some vm_area_struct corruption:
> any ideas on where that's coming from?
Hugh,
I think that what we're seeing isn't a corruption of vm_area_struct
per-se, but something weirder.
I've poisoned every spot where vm_area_struct is allocated, and yet
there seems to be nothing that's hitting that field before we end
up using a "zeroed out" vm_area_struct.
The results are the same both with and without kasan, there seems
to be no corruption happening anywhere, but we somehow end up with
an empty vm_area_struct.
It also somewhat makes sense considering that we're seeing no slub
corruption either. Either something is zeroing out *exactly*
vm_area_struct, or it's not really corruption...
Thanks,
Sasha
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WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sasha.levin@oracle.com>
To: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mgorman@suse.de
Subject: Re: [PATCH 0/5] mm: poison critical mm/ structs
Date: Thu, 09 Oct 2014 15:11:39 -0400 [thread overview]
Message-ID: <5436DDEB.5090004@oracle.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1410020154500.6444@eggly.anvils>
On 10/02/2014 05:23 AM, Hugh Dickins wrote:
> I'm glad to hear they've confirmed some vm_area_struct corruption:
> any ideas on where that's coming from?
Hugh,
I think that what we're seeing isn't a corruption of vm_area_struct
per-se, but something weirder.
I've poisoned every spot where vm_area_struct is allocated, and yet
there seems to be nothing that's hitting that field before we end
up using a "zeroed out" vm_area_struct.
The results are the same both with and without kasan, there seems
to be no corruption happening anywhere, but we somehow end up with
an empty vm_area_struct.
It also somewhat makes sense considering that we're seeing no slub
corruption either. Either something is zeroing out *exactly*
vm_area_struct, or it's not really corruption...
Thanks,
Sasha
next prev parent reply other threads:[~2014-10-09 19:14 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-30 1:47 [PATCH 0/5] mm: poison critical mm/ structs Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-09-30 1:47 ` [PATCH 1/5] mm: add poisoning basics Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-09-30 1:47 ` [PATCH 2/5] mm: constify dump_page and friends Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-09-30 1:47 ` [PATCH 3/5] mm: poison mm_struct Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-09-30 1:47 ` [PATCH 4/5] mm: poison vm_area_struct Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-09-30 1:47 ` [PATCH 5/5] mm: poison page struct Sasha Levin
2014-09-30 1:47 ` Sasha Levin
2014-10-07 22:02 ` Dave Hansen
2014-10-07 22:02 ` Dave Hansen
2014-10-08 7:10 ` Christoph Lameter
2014-10-08 7:10 ` Christoph Lameter
2014-10-08 14:22 ` Sasha Levin
2014-10-08 14:22 ` Sasha Levin
2014-10-01 21:07 ` [PATCH 0/5] mm: poison critical mm/ structs Andrew Morton
2014-10-01 21:07 ` Andrew Morton
2014-10-01 21:39 ` Sasha Levin
2014-10-01 21:39 ` Sasha Levin
2014-10-01 21:48 ` Andrew Morton
2014-10-01 21:48 ` Andrew Morton
2014-10-02 3:51 ` Sasha Levin
2014-10-02 3:51 ` Sasha Levin
2014-10-02 9:23 ` Hugh Dickins
2014-10-02 9:23 ` Hugh Dickins
2014-10-02 14:58 ` Sasha Levin
2014-10-02 14:58 ` Sasha Levin
2014-10-07 22:16 ` Dave Hansen
2014-10-07 22:16 ` Dave Hansen
2014-10-08 16:43 ` Sasha Levin
2014-10-08 16:43 ` Sasha Levin
2014-10-02 15:13 ` Dave Jones
2014-10-02 15:13 ` Dave Jones
2014-10-09 19:11 ` Sasha Levin [this message]
2014-10-09 19:11 ` Sasha Levin
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