linux-kernel - Re: INFO: task hung in hub_port

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Date:   Mon, 13 Sep 2021 09:54:59 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Hao Sun <sunhao.th@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org,
        a.darwish@...utronix.de, johan@...nel.org,
        linux-kernel@...r.kernel.org, oneukum@...e.com
Subject: Re: INFO: task hung in hub_port_init

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@...il.com>

There's not much hope of finding the cause of a problem like this 
without seeing the kernel log.

Alan Stern