Re: [syzbot] [bpf?] KMSAN: uninit-value in trie_delete_elem

[Yonghong Song]

On 4/3/24 1:47 AM, Aleksandr Nogikh wrote:
> On Wed, Apr 3, 2024 at 5:59 AM Yonghong Song <yonghong.song@xxxxxxxxx> 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@xxxxxxxxx> 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.