Date: Wed, 11 Feb 2015 10:21:50 -0500 (EST)
From: Alan Stern <stern@rowland.harvard.edu>
To: Enrico Mioso <mrkiko.rs@gmail.com>
cc: linux-usb@vger.kernel.org, <linux-kernel@vger.kernel.org>
Subject: Re: intensive IO on usb-storage device causing system lock
In-Reply-To: <alpine.LNX.2.03.1502101310070.1522@gmail.com>
Message-ID: <Pine.LNX.4.44L0.1502111018180.1100-100000@iolanthe.rowland.org>
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On Tue, 10 Feb 2015, Enrico Mioso wrote:

> Hello guys.
> the problem is still reproducible with final 3.19 kernel - I can confirm it.
> Re-sending the last trace here - don't know if it's available in cxg.de.

Please stop posting these process traces.  They don't help.

Instead, post a usbmon trace showing what happens around the time when 
the problem occurs.  If the trace file is quite large (which is likely, 
because usbmon can generate a lot of data in a short time), you can 
cut out everything up to the last few hundreds of KB before the problem 
starts.

> For those who might not have read the thread - the problem is: after some
> intensive IO to an USB (usb-storage) disk, for a more or less long time,
> depending on the quantity of IO you do, there start to be situations where some
> processes get stuck doing IO, in any case. Not IO to the USB disk, but IO also 
> to other devices, like the one where the root partition resides, in my case a 
> flash drive. I am using an EEE PC 701.

That sounds like the problem may lie somewhere other than in the USB 
stack.  But there's no way to tell without seeing a usbmon trace.

Alan Stern


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