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Re: 2.6.38: XFS/USB/HW issue, or failing USB stick?

To: Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx>
Subject: Re: 2.6.38: XFS/USB/HW issue, or failing USB stick?
From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 18 Mar 2011 15:26:52 -0400 (EDT)
Cc: linux-usb@xxxxxxxxxxxxxxx, <xfs@xxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, Alan Piszcz <ap@xxxxxxxxxxxxx>
In-reply-to: <alpine.DEB.2.02.1103181346340.21715@xxxxxxxxxxxxxxxx>
On Fri, 18 Mar 2011, Justin Piszcz wrote:

> > The stick didn't "fail" in any obvious way, but for some reason it was
> > disconnected from the USB bus.  (If it initiated that disconnect by
> > itself, I guess you could consider that a failure.)  Maybe it was
> > something as simple as overheating causing a loss of electrical contact
> > between the connector and the pins in the USB port.
> 
> It is possible, but the box is kept cool:

Then something else caused the disconnection.  Maybe a bug in the USB 
stick's firmware.

> >> Mar 18 08:33:06 atom [ 2283.963059] usb 1-1: new high speed USB device 
> >> using ehci_hcd and address 4
> >> Mar 18 08:33:06 atom [ 2284.080647] usb 1-1: New USB device found, 
> >> idVendor=0325, idProduct=ac02
> >> Mar 18 08:33:06 atom [ 2284.080707] usb 1-1: New USB device strings: 
> >> Mfr=1, Product=2, SerialNumber=3
> >> Mar 18 08:33:06 atom [ 2284.080752] usb 1-1: Product: R2_TURBO
> >> Mar 18 08:33:06 atom [ 2284.080794] usb 1-1: Manufacturer: OCZ Technology
> >> Mar 18 08:33:06 atom [ 2284.080831] usb 1-1: SerialNumber: (removed)
> >
> > And then 22 seconds later it reconnected.
> >
> > Alan Stern
> >
> 
> Very strange, could some USB option cause this?

No.

>  I guess next step is use
> ext2 and a different stick in the same port to see if I can get it to recur.
> Then if it happens again, try a different port.

Okay, go ahead and see what happens.

Alan Stern

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