linux-kernel - Re: KASAN: invalid-access Read in kmem_cache

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Date:   Thu, 28 Jan 2021 12:34:28 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>, mbenes@...e.cz,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>
Subject: Re: KASAN: invalid-access Read in kmem_cache_destroy



On 1/27/21 7:50 PM, Andrey Konovalov wrote:
> On Wed, Jan 27, 2021 at 6:44 PM Mark Brown <broonie@...nel.org> wrote:
>>
>> On Wed, Jan 27, 2021 at 06:14:13PM +0100, Dmitry Vyukov wrote:
>>> On Wed, Jan 27, 2021 at 5:58 PM syzbot
>>> <syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com> wrote:
>>>>
>>>> Hello,
>>>>
>>>> syzbot found the following issue on:
>>>>
>>>> HEAD commit:    2ab38c17 mailmap: remove the "repo-abbrev" comment
>>>> git tree:       upstream
>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=12eb4ad8d00000
>>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=ad43be24faf1194c
>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=2a52b6c31dbefb1e9d9f
>>>> userspace arch: arm64
>>>>
>>>> Unfortunately, I don't have any reproducer for this issue yet.
>>>>
>>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>>> Reported-by: syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com
>>>
>>> This happens on arm64 instance with MTE enabled.
>>> I don't see any corresponding reports on x86_64. So I would assume
>>> it's a generic latent bug, or probably more likely a bug in MTE
>>> support.
>>
>> Copying in Vincenso who's done a bunch of MTE stuff recently.
> 
> Could be the same issue as:
> 
> https://lkml.org/lkml/2021/1/27/1109
> 

I had a look at the trace and I agree with Andrey it seems the same issue.

-- 
Regards,
Vincenzo