linux-kernel - Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in mas_next

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Message-ID: <20250717234212.2329-1-hdanton@sina.com>
Date: Fri, 18 Jul 2025 07:42:11 +0800
From: Hillf Danton <hdanton@...a.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: syzbot <syzbot+ebfd0e44b5c11034e1eb@...kaller.appspotmail.com>,
	akpm@...ux-foundation.org,
	liam.howlett@...cle.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	syzkaller-bugs@...glegroups.com,
	vbabka@...e.cz
Subject: Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in mas_next_slot (2)

On Thu, 17 Jul 2025 17:06:34 +0100 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

Top reply is not encouraged lad.

> OK on second thoughts, there is one additional thing we need to do on each
> loop to avoid observing the same VMA, either the prior logic of checking
> directly or a vma_next().
> 
> So this may be a consequence of that.
> 
> I will respin the series to make life easier...
> 
Better after syzbot gives you Tested-by.

> On Thu, Jul 17, 2025 at 05:18:17AM +0100, Lorenzo Stoakes wrote:
> > This looks to be unrelated to my patch and some issue with syzbot (it's doing
> > weird injection stuff).
> >
> > As I said, I have tested the change with reproducer locally and it fixes the
> > issue, and I have been able to reliably observe that (note, without any of the
> > below stuff happening).
> >
> > Thanks