Re: INFO: task hung in hub_port_init

[Hao Sun]

Hi Alan,

Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> 于2021年9月13日周一 下午9:55写道：
>
> 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/view?usp=sharing
> > kernel config: https://drive.google.com/file/d/1qrJUXD8ZIeAkg-xojzDpp04v9MtQ8RR6/view?usp=sharing
> > Syzlang reproducer:
> > https://drive.google.com/file/d/1tZe8VmXfxoPqlNpzpGOd-e5WCSWgbkxB/view?usp=sharing
> > Similar report:
> > https://groups.google.com/g/syzkaller-bugs/c/zX55CUzjBOY/m/uf91r0XqAgAJ
> >
> > Sorry, I don't have a C reproducer for this crash but have a Syzlang
> > 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_syzkaller_programs.md
> >
> > If you fix this issue, please add the following tag to the commit:
> > Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>
>
> 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.

Regards
Hao