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

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Date: Tue, 2 Apr 2024 08:36:44 +0200
From: Aleksandr Nogikh <nogikh@...gle.com>
To: Yonghong Song <yonghong.song@...ux.dev>, 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

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?

-- 
Aleksandr