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

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Message-ID: <CANp29Y7WXm58E=Dv5WFivKuSz-OSCjMQLhBVdPA=ZpNmwcMitg@mail.gmail.com>
Date: Wed, 3 Apr 2024 10:47:03 +0200
From: Aleksandr Nogikh <nogikh@...gle.com>
To: Yonghong Song <yonghong.song@...ux.dev>
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 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.

-- 
Aleksandr