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Subject: Re: Linux 3.0 oopses when pulling a USB CDROM
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Alan Stern <stern@rowland.harvard.edu>, Dave Jones <davej@redhat.com>,
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Date: Sat, 02 Jul 2011 12:09:26 -0500
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On Sat, 2011-07-02 at 19:05 +0200, Andi Kleen wrote:
> > Which goes from the device unplug to the oops.  However, there are puts
> > missing from this; particularly the one where the reference goes to
> > zero.
> 
> The count was always one off because it dumps it before the actual
> put.

I know this.  What I mean is the last seen put count before the oops is
3 (not 1).

And the transition after unplug goes

13->12->10->8->7->6->5->3

implying we're missing put events.

James