linux-kernel - Re: intensive IO on usb-storage device causing system lock

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Message-ID: <alpine.LNX.2.03.1502111730450.4336@gmail.com>
Date:	Wed, 11 Feb 2015 17:31:05 +0100 (CET)
From:	Enrico Mioso <mrkiko.rs@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: intensive IO on usb-storage device causing system lock

Thank you. If I'll be able I'll try.
Thank you again guys.
Enrico



On Wed, 11 Feb 2015, Alan Stern wrote:

> Date: Wed, 11 Feb 2015 16:21:50
> From: Alan Stern <stern@...land.harvard.edu>
> To: Enrico Mioso <mrkiko.rs@...il.com>
> Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
> Subject: Re: intensive IO on usb-storage device causing system lock
> 
> 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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