From: Andrey Konovalov <andreyknvl@google.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Felipe Balbi" <balbi@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Peter Chen" <peter.chen@nxp.com>,
"Krzysztof Opasiak" <k.opasiak@samsung.com>,
"Colin Ian King" <colin.king@canonical.com>,
"Felix Hädicke" <felixhaedicke@web.de>,
"Roger Quadros" <rogerq@ti.com>,
"USB list" <linux-usb@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Kostya Serebryany" <kcc@google.com>,
syzkaller <syzkaller@googlegroups.com>
Subject: Re: usb/gadget: another GPF in usb_gadget_unregister_driver
Date: Wed, 7 Jun 2017 17:15:42 +0200 [thread overview]
Message-ID: <CAAeHK+xnHVNz_YfgMs4nGGDwJxZn8G1Y59gtY=UKVbZgPQb0xA@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1706071039530.1751-100000@iolanthe.rowland.org>
On Wed, Jun 7, 2017 at 4:43 PM, Alan Stern <stern@rowland.harvard.edu> wrote:
> 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?
Here's the syzkaller program (which is actually two programs executed
consequently):
https://gist.github.com/xairy/fe0a7531e00df5e8bc23e2e56e413510
Here's the strace log:
https://gist.github.com/xairy/5fadc3b5d8b2b80c97e566538de08bc4
Unfortunately there's a lot of unrelated garbage, but I can't extract
a simple C reproducer.
I can also apply patches with debug printk's, run the reproducer and
send you the result if that will help.
>
> Alan Stern
>
next prev parent reply other threads:[~2017-06-07 15:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 13:39 usb/gadget: another GPF in usb_gadget_unregister_driver Andrey Konovalov
2017-06-07 14:43 ` Alan Stern
2017-06-07 15:15 ` Andrey Konovalov [this message]
2017-06-07 21:20 ` Alan Stern
2017-06-08 11:40 ` Andrey Konovalov
2017-06-08 15:55 ` Alan Stern
2017-06-08 16:34 ` Andrey Konovalov
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