Subject: Re: 2.6.27.2 USB reset/IO Error problem when high load on ICH9 USB
From: Kasper Sandberg <lkml@metanurb.dk>
To: Robert Hancock <hancockr@shaw.ca>
Cc: LKML Mailinglist <linux-kernel@vger.kernel.org>
In-Reply-To: <490A5977.8090705@shaw.ca>
References: <fa.PPRUdlhLAQMsAcsErf8qHTGwTPQ@ifi.uio.no>
	 <490A5977.8090705@shaw.ca>
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Date: Sat, 01 Nov 2008 12:07:17 +0100
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On Thu, 2008-10-30 at 19:03 -0600, Robert Hancock wrote:
> Kasper Sandberg wrote:
> > Hello..
> > 
> > I had to write an image to some usb flash drives, more specifically, 4GB
> > kingston datatraveler sticks, and i figured, instead of doing just 1 at
> > a time, i may aswell do 4, so i plugged in 4, and started 4 dd's of the
> > images, to sdc, sdd, sde, sdf. However, i got usb disconnects and IO
> > error messages from the kernel, these are at end of message. I had
> > previously done ~5 writes of images to 5 other flash disks with no
> > problem, but when i tried the next batch, those 4, it gave these errors.
> > I killed the dd's, pulled them all out, and put in 1 at a time, and it
> > worked perfectly.
> > 
> > unfortunately the first kernel messages have been flooded away. If you
> > need .config and/or the boot kernel messages, i can reboot and get it.
> 
> It seems suspicious that only the sde one (with address 6) seems to be 
> having problems. Are you sure that drive wasn't faulty or somehow not 
> plugged in properly?


I am absolutely positive it was plugged in properly, and i am also sure
the usb port isnt broken, i have tested all of them, though, this is
first time i have had so many in use concurrently, maybe its a power
issue? (which would be weird though, as flash devices shouldnt be using
so much power)

as for faulty, i did use that exact drive again, when i reverted back to
doing one by one.

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