linux-kernel - Re: 6.12/BUG: KASAN: slab-use-after-free in m_next at fs/proc/task

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Message-ID: <CABXGCsOsZ5TyEjSWTk6e=FU30a27N4J0gqNCat65gweyKPtZ_A@mail.gmail.com>
Date: Thu, 3 Oct 2024 01:45:23 +0500
From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, 
	Linux regressions mailing list <regressions@...ts.linux.dev>, linux-fsdevel@...r.kernel.org, 
	Liam.Howlett@...cle.com, Andrew Morton <akpm@...ux-foundation.org>, 
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: 6.12/BUG: KASAN: slab-use-after-free in m_next at fs/proc/task_mmu.c:187

On Wed, Oct 2, 2024 at 10:56 PM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
> We can reliably repro it with CONFIG_DEBUG_VM_MAPLE_TREE, CONFIG_DEBUG_VM, and
> CONFIG_DEBUG_MAPLE_TREE set, if you set these you should see a report more
> quickly (let us know if you do).

mikhail@...mary-ws ~/dmesg> cat .config | grep 'CONFIG_DEBUG_VM_MAPLE_TREE'
# CONFIG_DEBUG_VM_MAPLE_TREE is not set
mikhail@...mary-ws ~/dmesg> cat .config | grep 'CONFIG_DEBUG_VM'
CONFIG_DEBUG_VM_IRQSOFF=y
CONFIG_DEBUG_VM=y
# CONFIG_DEBUG_VM_MAPLE_TREE is not set
# CONFIG_DEBUG_VM_RB is not set
CONFIG_DEBUG_VM_PGFLAGS=y
CONFIG_DEBUG_VM_PGTABLE=y
mikhail@...mary-ws ~/dmesg> cat .config | grep 'CONFIG_DEBUG_MAPLE_TREE'
# CONFIG_DEBUG_MAPLE_TREE is not set

Fedora's kernel build uses only CONFIG_DEBUG_VM and it's enough for
reproducing this issue.
Anyway I enabled all three options. I'll try to live for a day without
steam launching. In a day I'll write whether it is reproducing without
steam or not.

On Thu, Oct 3, 2024 at 1:32 AM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
> Out of curiosity, what GPU are you using? :)

The issue reproduces on all my machines.
One has an AMD Radeon 6900 XT and a second AMD Radeon 7900 XTX.

-- 
Best Regards,
Mike Gavrilov.