linux-kernel - Re: [syzbot] [kvm?] KMSAN: uninit-value in em_ret

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Message-ID: <CANp29Y5w86RrZPNdH0UqNi9m4po1swUH75153FEtkw0BduE9xw@mail.gmail.com>
Date: Fri, 19 Jan 2024 17:55:46 +0100
From: Aleksandr Nogikh <nogikh@...gle.com>
To: syzbot <syzbot+579eb95e588b48b4499c@...kaller.appspotmail.com>
Cc: glider@...gle.com, linux-kernel@...r.kernel.org, n.zhandarovich@...tech.ru, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kvm?] KMSAN: uninit-value in em_ret_far

I think it's not entirely correct to test it on the kmsan tree as the
kmsan tree is actually quite old (the last commit was 6 months ago),
which is way earlier than the point of time when the bug was detected
(syzbot found it only in Nov 2023 -- 2 months ago).

https://syzkaller.appspot.com/bug?extid=579eb95e588b48b4499c

The bug was last hit today on the head of the torvalds tree:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=9f8413c4a66f2fb776d3dc3c9ed20bf435eb305e

On Fri, Jan 19, 2024 at 5:42 PM syzbot
<syzbot+579eb95e588b48b4499c@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+579eb95e588b48b4499c@...kaller.appspotmailcom
>
> Tested on:
>
> commit:         d1d7f15c DO-NOT-SUBMIT: kmsan: add the kmsan_exceed_ma..
> git tree:       https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=1726e677e80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6b301bd980290807
> dashboard link: https://syzkaller.appspot.com/bug?extid=579eb95e588b48b4499c
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>
> Note: no patches were applied.
> Note: testing is done by a robot and is best-effort only.
>
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