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From: Andrey Konovalov <andreyknvl@google.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: syzbot <syzbot+7fa38a608b1075dfd634@syzkaller.appspotmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Kai Heng Feng <kai.heng.feng@canonical.com>,
	LKML <linux-kernel@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>,
	mans@mansr.com, Oliver Neukum <oneukum@suse.com>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: general protection fault in usb_set_interface
Date: Thu, 19 Sep 2019 17:19:12 +0200
Message-ID: <CAAeHK+xcJjE_+U7tTs76CkV1v95r8J+eKXhMj00iyrHA2cxGmA@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1909181454300.1507-100000@iolanthe.rowland.org>

On Wed, Sep 18, 2019 at 8:57 PM Alan Stern <stern@rowland.harvard.edu> wrote:
>
> On Tue, 17 Sep 2019, syzbot wrote:
>
> > Hello,
> >
> > syzbot has tested the proposed patch but the reproducer still triggered
> > crash:
> > WARNING in sysfs_remove_group
> >
> > ------------[ cut here ]------------
> > sysfs group 'power' not found for kobject 'radio0'
>
> Andrey:
>
> Is there any way to tell syzbot to run the reproducer but with only one
> device instance (that is, only one dummy-hcd bus)?
>
> Or can you a new, modified reproducer that will do this?

AFAIU there two bugs here and you've fixed the first one, but the
second one gets triggered.

I think the second one got reported separately here:

https://syzkaller.appspot.com/bug?extid=5b9bba68c833c84a1135

That one has a reproducer with a single dummy-hcd, so you can try
running your debugging patch against that report.

I'll see if I can run it manually in the meantime.

  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-16 13:29 syzbot
2019-09-16 20:51 ` Alan Stern
2019-09-16 21:03   ` syzbot
2019-09-17 15:16     ` Alan Stern
2019-09-17 15:28       ` syzbot
2019-09-17 15:53         ` Alan Stern
2019-09-17 16:06           ` syzbot
2019-09-17 17:36             ` Alan Stern
2019-09-17 18:08               ` Alan Stern
2019-09-17 18:15                 ` syzbot
2019-09-17 18:31                   ` Alan Stern
2019-09-17 18:43                     ` syzbot
2019-09-18 18:57                       ` Alan Stern
2019-09-19 15:19                         ` Andrey Konovalov [this message]
2019-12-13 12:15 ` Andrey Konovalov
2019-12-13 12:16   ` syzbot
2019-12-13 12:19     ` Andrey Konovalov
2019-12-13 19:51       ` Alan Stern
2019-12-10 20:17 Re: KASAN: use-after-free Read in usbvision_v4l2_open Alan Stern
2019-12-12 16:52 ` general protection fault in usb_set_interface Alan Stern

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