linux-kernel - Re: USBFS Memory allocation Bug

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Date:	Wed, 10 Mar 2010 00:32:42 +0100
From:	Markus Rechberger <mrechberger@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	LKML <linux-kernel@...r.kernel.org>, Greg KH <greg@...ah.com>
Subject: Re: USBFS Memory allocation Bug

On Tue, Mar 9, 2010 at 11:31 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Tue, 9 Mar 2010, Markus Rechberger wrote:
>
>> Hi,
>>
>> I just stumbled around following issue:
>>
>> [275835.163502] Pid: 14298, comm: mediasrv Not tainted 2.6.33 #7
>> [275835.163505] Call Trace:
>> [275835.163514]  [<ffffffff810df7a6>] __alloc_pages_nodemask+0x5b6/0x700
>> [275835.163520]  [<ffffffff8110c667>] alloc_pages_current+0x87/0xd0
>> [275835.163525]  [<ffffffff810dcf79>] __get_free_pages+0x9/0x50
>> [275835.163529]  [<ffffffff81114f2b>] __kmalloc+0x13b/0x1f0
>> [275835.163535]  [<ffffffff813a18ef>] proc_do_submiturb+0x2ff/0x9d0
>> [275835.163539]  [<ffffffff813a26b9>] usbdev_do_ioctl+0x6f9/0x14a0
>
> The mediasrv program tried to allocate more memory than was available.
> It's unfortunate but it's not a bug.
>

Yes, 'unfortunate' is what bothers me about this, it can only be
around 198kbyte what the app can try to request (everything else will
fail internally).
The system has 4 gig ram, around 1 gig was not allocated (according to
free). not sure but I guess the pool where kmalloc tried to get the
memory from was out of memory, at least the OOM manager was not active
at all either and the rest of the system was more or less running
smoothly at this time.

Markus
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