linux-kernel - Re: [PATCH] USB: EHCI: fix for leaking isochronous data

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Message-ID: <5142383F.6010001@web.de>
Date:	Thu, 14 Mar 2013 21:51:11 +0100
From:	Soeren Moch <smoch@....de>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Arnd Bergmann <arnd@...db.de>,
	USB list <linux-usb@...r.kernel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-mm@...ck.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] USB: EHCI: fix for leaking isochronous data

On 14.03.2013 21:32, Alan Stern wrote:
> On Thu, 14 Mar 2013, Soeren Moch wrote:
>
>>>> I added a debug message to
>>>> drivers/usb/host/ehci-sched.c:itd_urb_transaction() to log the
>>>> allocation flags, see log below.
>>>
>>> But it looks like you didn't add a message to end_free_itds(), so we
>>> don't know when the memory gets deallocated.  And you didn't print out
>>> the values of urb, num_itds, and i, or the value of itd (so we can
>>> match up allocations against deallocations).
>>
>> OK, I will implement this more detailed logging. But with several
>> allocations per second and runtime of several hours this will result in
>> a very long logfile.
>
> If the memory really is being leaked here in some sort of systematic
> way, we may be able to see it in your debugging output after a few
> seconds.
>

OK, here are the first seconds of the log. But the buffer exhaustion 
usually occurs after several hours of runtime...

  Soeren Moch


Download attachment "syslog.gz" of type "application/x-gzip" (24383 bytes)