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Date:   Mon, 14 Jan 2019 15:51:54 +0000
To:     Qian Cai <cai@lca.pw>
From:   Esme <esploit@protonmail.ch>
Cc:     "dgilbert@interlog.com" <dgilbert@interlog.com>,
        David Lechner <david@lechnology.com>,
        Michel Lespinasse <walken@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "jejb@linux.ibm.com" <jejb@linux.ibm.com>,
        "martin.petersen@oracle.com" <martin.petersen@oracle.com>,
        "joeypabalinas@gmail.com" <joeypabalinas@gmail.com>,
        linux-mm <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
Reply-To: Esme <esploit@protonmail.ch>
Subject: Re: [PATCH v2] rbtree: fix the red root
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Disabled kmemleak options. On mobile, pardon brevity.


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ssage =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90
On Monday, January 14, 2019 10:45 AM, Qian Cai <cai@lca.pw> wrote:

> On 1/14/19 1:23 AM, Esme wrote:
>
> > I did not yet verify the previous branches but did tune out kmemleak (C=
ONFIG_DEBUG_MEMLEAK no longer set) as it seemed a bit obtrusive in this mat=
ter, this is what I see now (note redzone?).
> > /Esme
> > 114.826116] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> > [ 114.828121] BUG kmalloc-64 (Tainted: G W ): Padding overwritten. 0x00=
0000006913c65d-0x000000006e410492
> > [ 114.830551] ---------------------------------------------------------=
--------------------
> > [ 114.830551]
> > [ 114.832755] INFO: Slab 0x0000000054f47c55 objects=3D19 used=3D19 fp=
=3D0x (null) flags=3D0x1fffc0000010200
> > [ 114.835063] CPU: 0 PID: 6310 Comm: x Tainted: G B W 5.0.0-rc2 #15
> > [ 114.836829] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BI=
OS 1.11.1-1ubuntu1 04/01/2014
> > [ 114.838847] Call Trace:
> > [ 114.839497] dump_stack+0x1d8/0x2c6
> > [ 114.840274] ? dump_stack_print_info.cold.1+0x20/0x20
> > [ 114.841402] slab_err+0xab/0xcf
> > [ 114.842103] ? __asan_report_load1_noabort+0x14/0x20
> > [ 114.843244] ? memchr_inv+0x2c1/0x330
> > [ 114.844059] slab_pad_check.part.50.cold.87+0x27/0x81
>
> Confused again. Those slab_pad_check() looks like only with SLUB, but you=
 said
> you used SLAB. What else did you change?