linux-kernel - Re: usb/gadget: another GPF in usb_gadget_unregister

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Message-ID: <Pine.LNX.4.44L0.1706071039530.1751-100000@iolanthe.rowland.org>
Date:   Wed, 7 Jun 2017 10:43:14 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Andrey Konovalov <andreyknvl@...gle.com>
cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Chen <peter.chen@....com>,
        Krzysztof Opasiak <k.opasiak@...sung.com>,
        Colin Ian King <colin.king@...onical.com>,
        Felix Hädicke <felixhaedicke@....de>,
        Roger Quadros <rogerq@...com>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/gadget: another GPF in usb_gadget_unregister_driver

On Wed, 7 Jun 2017, Andrey Konovalov wrote:

> Hi,
> 
> I've got the following error report while fuzzing the kernel with syzkaller.
> 
> On commit b29794ec95c6856b316c2295904208bf11ffddd9 (4.12-rc4+).
> 
> This looks quite similar to
> https://groups.google.com/forum/#!topic/syzkaller/HDawLBeeORI

It does look very similar, but that problem was supposed to have been 
fixed by commit 7b0173811260 ("usb: gadget: udc: core: fix return code 
of usb_gadget_probe_driver()").

> I'm able to reproduce this, so I can collect some debug traces if needed.

Can you provide an strace or the equivalent?

Alan Stern