linux-kernel - Re: 2.6.36-rc7: NULL pointer dereference in ehci_clear_tt_buffer

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Date:	Sat, 16 Oct 2010 22:35:24 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	David Brownell <david-b@...bell.net>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.36-rc7: NULL pointer dereference in ehci_clear_tt_buffer_complete

Alan Stern wrote:
> On Sat, 16 Oct 2010, Stefan Richter wrote:
>> Alan Stern wrote:
>>> --- usb-2.6.orig/drivers/usb/core/message.c
>>> +++ usb-2.6/drivers/usb/core/message.c
>>> @@ -323,8 +323,13 @@ static void sg_complete(struct urb *urb)
>>>  	/* on the last completion, signal usb_sg_wait() */
>>>  	io->bytes += urb->actual_length;
>>>  	io->count--;
>>> -	if (!io->count)
>>> +	if (!io->count) {
>>> +		if (status == -ECONNRESET) {
>>> +			printk(KERN_ERR "Delaying for test\n");
>>> +			mdelay(600);
>>> +		}
>>>  		complete(&io->complete);
>>> +	}
>>>  
>>>  	spin_unlock(&io->lock);
>>>  }
>>>
>> I did so today on 2.6.36-rc8, without your other patch.  I was still unable to
>> reproduce the bug.  Forget the whole thing as unreproducible?
> 
> What I said above wasn't quite right.  This won't help trigger the 
> oops, but it should trigger the line saying something like
> 
> 	ehci_hcd 0000:00:12.2: qh ffff880208f07af0 (#00) state 5
> 
> That's the real bug.

# grep ' qh ' /var/log/messages
Oct 11 22:29:21 stein kernel: ehci_hcd 0000:00:12.2: qh ffff880208f07af0 (#00)
state 5

I.e. there was none anymore since the one which I reported on Monday.
-- 
Stefan Richter
-=====-==-=- =-=- =----
http://arcgraph.de/sr/
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