netdev - Re: [PATCH 2/2] usbnet: Fix a race between usbnet

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Message-Id: <20150825.194506.1707236727848929581.davem@davemloft.net>
Date:	Tue, 25 Aug 2015 19:45:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eugene.shatokhin@...alab.ru
Cc:	oneukum@...e.de, bjorn@...k.no, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] usbnet: Fix a race between usbnet_stop() and the BH

From: Eugene Shatokhin <eugene.shatokhin@...alab.ru>
Date: Mon, 24 Aug 2015 23:13:43 +0300

> The race may happen when a device (e.g. YOTA 4G LTE Modem) is
> unplugged while the system is downloading a large file from the Net.
> 
> Hardware breakpoints and Kprobes with delays were used to confirm that
> the race does actually happen.
> 
> The race is on skb_queue ('next' pointer) between usbnet_stop()
> and rx_complete(), which, in turn, calls usbnet_bh().
> 
> Here is a part of the call stack with the code where the changes to the
> queue happen. The line numbers are for the kernel 4.1.0:
 ...

It looks like this patch needs more discussion/work.

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