linux-kernel - Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete

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Date: Thu, 4 Apr 2024 12:00:11 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Aleksandr Nogikh <nogikh@...gle.com>
Cc: Alexander Potapenko <glider@...gle.com>,
 syzbot <syzbot+603bcd9b0bf1d94dbb9b@...kaller.appspotmail.com>,
 andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
 daniel@...earbox.net, eddyz87@...il.com, haoluo@...gle.com,
 john.fastabend@...il.com, jolsa@...nel.org, kpsingh@...nel.org,
 linux-kernel@...r.kernel.org, martin.lau@...ux.dev, sdf@...gle.com,
 song@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem


On 4/3/24 1:47 AM, Aleksandr Nogikh wrote:
> On Wed, Apr 3, 2024 at 5:59 AM Yonghong Song <yonghong.song@...ux.dev> wrote:
>>
>> On 4/1/24 11:36 PM, Aleksandr Nogikh wrote:
>>> Hi,
>>>
>>> On Mon, Apr 1, 2024 at 8:55 PM Yonghong Song <yonghong.song@...ux.dev> wrote:
>>>> On 3/26/24 12:00 PM, syzbot wrote:
>>>>> Hello,
>>>>>
>>>>> syzbot found the following issue on:
>>>>>
>>>>> =====================================================
>>>>> BUG: KMSAN: uninit-value in trie_delete_elem+0xc0/0xbe0 kernel/bpf/lpm_trie.c:448
>>>> Unrelated to the bug itself, with KMSAN is enabled, qemu cannot boot my vm
>>>> any more. Anything special I need to do in order to boot a KMSAN kernel?
>>>>
>>> Does the kernel print any specific errors to the serial console while
>>> booting? Or nothing at all?
>> In my case, nothing at all.
>>
> If you're using qemu, please try adding "-machine pc-q35-7.1" to its
> arguments. Otherwise it's known to have problems with very large
> kernel images.

I still do not help. My qemu does not support pc-q35-7.1. The most
q35 machine is pc-q35-5.2 and it does not work.