linux-kernel - Re: Memory (skb) leak in kernel 4.8-rc2

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Message-ID: <2be4b143-4f0f-c688-87c3-8056ecc43dfb@lwfinger.net>
Date:   Wed, 24 Aug 2016 15:02:36 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Frederic Dalleau <frederic.dalleau@...labora.co.uk>,
        Marcel Holtmann <marcel@...tmann.org>,
        "Gustavo F. Padovan" <gustavo@...ovan.org>,
        Linux Bluetooth mailing list 
        <linux-bluetooth@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Memory (skb) leak in kernel 4.8-rc2

On 08/21/2016 07:09 AM, Frederic Dalleau wrote:
> Hi Marcel, Johan,
>
>>>> I am unable to unload module bluetooth to verify that the second
>>>> leak is not a false positive; however, the one in btusb is a real
>>>> memory leak.
>
> There was a bugzilla last week with that backtrace:
> https://bugzilla.kernel.org/show_bug.cgi?id=120691
>
> At the time, I was thinking that the leak could originate from one of the
> req_complete_skb callback, but which one?
>
> And today that the issue has popped again, I found that hci_req_sync_complete
> references the skb in hdev->req_skb. It is called (via hci_req_run_skb) from
> either __hci_cmd_sync_ev which will pass the skb to the caller, or
> __hci_req_sync which leaks.
>
> I have a patch on the grill.

Frédéric,

Any progress on this patch?

Thanks,

Larry