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Date:	Mon, 1 Sep 2014 12:26:51 +0200
From:	Ricardo Ribalda Delgado <>
To:	Mathias Nyman <>
Cc:	Greg Kroah-Hartman <>,
	Linux USB Mailing List <>,
	LKML <>
Subject: Re: [PATCH] xhci-ring: Fix Null pointer dereference

Well, it is hard to say. rc2 without the patch showed more warnings,
but never crashed badly (queuecommand_lck....).

The sample size is not big enough. maybe rc2 also has the
queuecommand_lck bug, but I havent hit it.

On Mon, Sep 1, 2014 at 12:37 PM, Mathias Nyman <> wrote:
> On 09/01/2014 12:36 PM, Ricardo Ribalda Delgado wrote:
>> After some time of use (one hour or so) my system started to behave
>> "weird". I did check  dmesg and I was receiving the following line
>> again and again:
>> usb-storage: Error in queuecommand_lck: us->sfb= ffff8805bd61ccc0
>> I did disconnect the usb device and the whole computer crashed :S
> Ok, thanks.
> Would you say things work better after the patch?
> I still think the patch solves part of the issue, i.e. how we handle halted endpoints
> in reset, but I don't know the reason why the endpoints stall in the first place
> -Mathias

Ricardo Ribalda
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