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From:   Hao Sun <sunhao.th@gmail.com>
Date:   Sat, 18 Sep 2021 10:17:26 +0800
Message-ID: <CACkBjsZPjO96NzLjKR2N7bYzBJRN6sPuaDpK6cvmGqKTd=Byow@mail.gmail.com>
Subject: Re: INFO: task hung in hub_port_init
To:     Alan Stern <stern@rowland.harvard.edu>
Cc:     Greg KH <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org,
        a.darwish@linutronix.de, johan@kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        oneukum@suse.com
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Alan Stern <stern@rowland.harvard.edu> =E4=BA=8E2021=E5=B9=B49=E6=9C=8818=
=E6=97=A5=E5=91=A8=E5=85=AD =E4=B8=8A=E5=8D=8810:02=E5=86=99=E9=81=93=EF=BC=
=9A
>
> On Sat, Sep 18, 2021 at 09:56:52AM +0800, Hao Sun wrote:
> > Hi Alan,
> >
> > Alan Stern <stern@rowland.harvard.edu> =E4=BA=8E2021=E5=B9=B49=E6=9C=88=
13=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5=8D=889:55=E5=86=99=E9=81=93=EF=
=BC=9A
> > >
> > > On Mon, Sep 13, 2021 at 11:13:15AM +0800, Hao Sun wrote:
> > > > Hello,
> > > >
> > > > When using Healer to fuzz the Linux kernel, the following crash was=
 triggered.
> > > >
> > > > HEAD commit: ac08b1c68d1b Merge tag 'pci-v5.15-changes'
> > > > git tree: upstream
> > > > console output:
> > > > https://drive.google.com/file/d/1ZeDIMe-DoY3fB32j2p5ifgpq-Lc5N74I/v=
iew?usp=3Dsharing
> > > > kernel config: https://drive.google.com/file/d/1qrJUXD8ZIeAkg-xojzD=
pp04v9MtQ8RR6/view?usp=3Dsharing
> > > > Syzlang reproducer:
> > > > https://drive.google.com/file/d/1tZe8VmXfxoPqlNpzpGOd-e5WCSWgbkxB/v=
iew?usp=3Dsharing
> > > > Similar report:
> > > > https://groups.google.com/g/syzkaller-bugs/c/zX55CUzjBOY/m/uf91r0Xq=
AgAJ
> > > >
> > > > Sorry, I don't have a C reproducer for this crash but have a Syzlan=
g
> > > > reproducer. Also, hope the symbolized report can help.
> > > > Here are the instructions on how to execute Syzlang prog:
> > > > https://github.com/google/syzkaller/blob/master/docs/executing_syzk=
aller_programs.md
> > > >
> > > > If you fix this issue, please add the following tag to the commit:
> > > > Reported-by: Hao Sun <sunhao.th@gmail.com>
> > >
> > > There's not much hope of finding the cause of a problem like this
> > > without seeing the kernel log.
> > >
> >
> > Healer found another Syzlang prog to reproduce this task hang:
> > https://paste.ubuntu.com/p/HCNYbKJYtx/
> >
> > Also here is a very simple script to execute the reproducer:
> > https://paste.ubuntu.com/p/ZTGmvFSP6d/
> >
> > The `syz-execprog` and `syz-executor` are needed, so please build
> > Syzkaller first before running the script.
> > Hope this can help to find the root cause of the problem.
>
> I don't have time to install and figure out how to use Healer and
> Syzkaller.  But if you run the reproducer and post the kernel log,
> I'll take a look at it.
>

Just executed the reproducer, here is the full log:
https://paste.ubuntu.com/p/x43SqQy8PX/

Hao