Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns

Path	csiph.com!aioe.org!bofh.it!news.nic.it!robomod
From	Alan Stern <stern@rowland.harvard.edu>
Newsgroups	linux.kernel
Subject	Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns
Date	Mon, 12 Dec 2016 22:10:01 +0100
Message-ID	<sNG1b-R8-1@gated-at.bofh.it> (permalink)
References	<sNFHP-v6-7@gated-at.bofh.it>
X-Original-To	Andrey Konovalov <andreyknvl@google.com>
X-X-Sender	stern@iolanthe.rowland.org
MIME-Version	1.0
Content-Type	TEXT/PLAIN; charset=US-ASCII
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	20
Organization	linux.* mail to news gateway
X-Original-Cc	Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 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>
X-Original-Date	Mon, 12 Dec 2016 16:05:43 -0500 (EST)
X-Original-Message-ID	<Pine.LNX.4.44L0.1612121602430.1502-100000@iolanthe.rowland.org>
X-Original-References	<CAAeHK+wnfCUAuN9skpGFsc+diddt0=Vv1+Xq=rzpK3SuzKhQDw@mail.gmail.com>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1540648

Show key headers only | View raw

On Mon, 12 Dec 2016, Andrey Konovalov wrote:

> Hi!
> 
> While running the syzkaller fuzzer I've got the following error report.
> 
> On commit 3c49de52d5647cda8b42c4255cf8a29d1e22eff5 (Dev 2).
> 
> WARNING: CPU: 2 PID: 865 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x8a/0xa0
> gadgetfs: disconnected
> sysfs: cannot create duplicate filename
> '/devices/platform/dummy_hcd.0/usb2/2-1/2-1:64.0/ep_05'
> Kernel panic - not syncing: panic_on_warn set ...

I suppose we could check for USB devices that claim to have two 
endpoints with the same address.  But is it really worthwhile?  A 
kernel warning isn't so bad when you're dealing with buggy device 
firmware.

Alan Stern

Thread

usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Andrey Konovalov <andreyknvl@google.com> - 2016-12-12 21:50 +0100
  Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-12 22:10 +0100
    Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Dmitry Vyukov <dvyukov@google.com> - 2016-12-12 22:20 +0100
      Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-12-12 22:50 +0100
      Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-12 22:50 +0100
        Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-12 23:10 +0100
          Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Dmitry Vyukov <dvyukov@google.com> - 2016-12-13 16:10 +0100
            Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-13 17:00 +0100
              Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Dmitry Vyukov <dvyukov@google.com> - 2016-12-13 17:30 +0100
                Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-13 19:40 +0100
                Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Dmitry Vyukov <dvyukov@google.com> - 2016-12-13 19:50 +0100
                Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-13 21:20 +0100
                Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Dmitry Vyukov <dvyukov@google.com> - 2016-12-13 21:40 +0100
  Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Alan Stern <stern@rowland.harvard.edu> - 2016-12-16 19:10 +0100
    Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns Andrey Konovalov <andreyknvl@google.com> - 2016-12-17 18:20 +0100

csiph-web