linux-kernel - Re: [syzbot] [net?] [virt?] upstream test error: KMSAN: uninit-value in receive

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Date: Tue, 18 Jun 2024 09:27:39 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: syzbot <syzbot+799fbb6d9e02a7a1d62b@...kaller.appspotmail.com>,
 davem@...emloft.net,
 edumazet@...gle.com,
 eperezma@...hat.com,
 linux-kernel@...r.kernel.org,
 mst@...hat.com,
 netdev@...r.kernel.org,
 pabeni@...hat.com,
 syzkaller-bugs@...glegroups.com,
 virtualization@...ts.linux.dev,
 Jason Wang <jasowang@...hat.com>,
 Jakub Kicinski <kuba@...nel.org>
Subject: Re: [syzbot] [net?] [virt?] upstream test error: KMSAN: uninit-value in receive_buf

On Mon, 17 Jun 2024 16:15:54 +0900, Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> Bisection reached commit f9dac92ba908 ("virtio_ring: enable premapped mode
> whatever use_dma_api").
>
> On 2024/05/26 1:12, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    56fb6f92854f Merge tag 'drm-next-2024-05-25' of https://gi..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=157a5462980000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=1b6c22bca89a3565
> > dashboard link: https://syzkaller.appspot.com/bug?extid=799fbb6d9e02a7a1d62b
> > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/39a256e13faa/disk-56fb6f92.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/d4ecc47a8198/vmlinux-56fb6f92.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/0d37bfdfb0ca/bzImage-56fb6f92.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+799fbb6d9e02a7a1d62b@...kaller.appspotmail.com
>

Maybe this patch can fix this issue:

	 http://lore.kernel.org/all/20240606111345.93600-1-xuanzhuo@linux.alibaba.com

Thanks.