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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Wed, 30 Sep 2020 18:16:49 +0200
Message-ID: <CACT4Y+a3-_C3MJtyo1UC6NcwNPnU2bmhGeGKo7OPh54CVkq1CQ@mail.gmail.com>
Subject: Re: [Linux-kernel-mentees] KMSAN: uninit-value in rt2500usb_probe_hw
To:     Anant Thazhemadam <anant.thazhemadam@gmail.com>
Cc:     Greg KH <greg@kroah.com>, Andrey Konovalov <andreyknvl@google.com>,
        syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Alexander Potapenko <glider@google.com>,
        syzbot <syzbot+35c80b2190255a410f66@syzkaller.appspotmail.com>,
        linux-kernel-mentees@lists.linuxfoundation.org
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On Wed, Sep 30, 2020 at 5:57 PM Anant Thazhemadam
<anant.thazhemadam@gmail.com> wrote:
> On 26/09/20 12:27 pm, Greg KH wrote:
> > On Sat, Sep 26, 2020 at 08:53:07AM +0200, Dmitry Vyukov via Linux-kernel-mentees wrote:
> >> On Sat, Sep 26, 2020 at 5:25 AM syzbot
> >> <syzbot+35c80b2190255a410f66@syzkaller.appspotmail.com> wrote:
> >>> Hello,
> >>>
> >>> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> >>>
> >>> Reported-and-tested-by: syzbot+35c80b2190255a410f66@syzkaller.appspotmail.com
> >>>
> >>> Tested on:
> >>>
> >>> commit:         c5a13b33 kmsan: clang-format core
> >>> git tree:       https://github.com/google/kmsan.git master
> >>> kernel config:  https://syzkaller.appspot.com/x/.config?x=41fca8ac7f9e770a
> >>> dashboard link: https://syzkaller.appspot.com/bug?extid=35c80b2190255a410f66
> >>> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
> >>>
> >>> Note: testing is done by a robot and is best-effort only.
> >> Hi Anant,
> >>
> >> I see you are testing lots of USB bugs. USB subsystem is currently
> >> broken, testing of any USB bugs will give false "no crash" results,
> >> see:
> >> https://lore.kernel.org/linux-kernel-mentees/CACT4Y+YmbmrH9gCCnCzP-FYa-dKxx9qhKZ+RQxi1f-+Hoj1SUg@mail.gmail.com/
> > Fixes for this USB problem are in my tree now and should show up in
> > linux-next on Monday.
> >
> > thanks,
> >
> > greg k-h
>
> Is there any chance you could identify the commit that fixes this bug?
> It would help us close the bug for good. :)

I think Greg meant the fix for the general USB brokenness, not a fix
for this syzbot bug. This bug is not fixed to the best of syzbot
knowledge.