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

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Message-ID: <02d29315-13ee-45c1-984e-13c98e88247b@linux.dev>
Date: Tue, 2 Apr 2024 20:59:10 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Aleksandr Nogikh <nogikh@...gle.com>,
 Alexander Potapenko <glider@...gle.com>
Cc: 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 4/1/24 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.

>