From: Yonghong Song <yonghong.song@linux.dev>
To: Aleksandr Nogikh <nogikh@google.com>
Cc: Alexander Potapenko <glider@google.com>,
syzbot <syzbot+603bcd9b0bf1d94dbb9b@syzkaller.appspotmail.com>,
andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, eddyz87@gmail.com, haoluo@google.com,
john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org,
linux-kernel@vger.kernel.org, martin.lau@linux.dev,
sdf@google.com, song@kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem
Date: Thu, 4 Apr 2024 12:00:11 -0700 [thread overview]
Message-ID: <110c4768-2294-436e-a96a-7063bae85ee7@linux.dev> (raw)
In-Reply-To: <CANp29Y7WXm58E=Dv5WFivKuSz-OSCjMQLhBVdPA=ZpNmwcMitg@mail.gmail.com>
On 4/3/24 1:47 AM, Aleksandr Nogikh wrote:
> On Wed, Apr 3, 2024 at 5:59 AM Yonghong Song <yonghong.song@linux.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@linux.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.
prev parent reply other threads:[~2024-04-04 19:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-26 19:00 [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem syzbot
2024-03-29 19:52 ` syzbot
2024-04-01 18:55 ` Yonghong Song
2024-04-02 6:36 ` Aleksandr Nogikh
2024-04-03 3:59 ` Yonghong Song
2024-04-03 8:47 ` Aleksandr Nogikh
2024-04-04 19:00 ` Yonghong Song [this message]
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