netdev - Re: [Bugme-new] [Bug 10737] New: pktgen procfs problem

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Date:	Sun, 18 May 2008 15:24:25 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	netdev@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	devzero@....de, Robert Olsson <robert.olsson@....uu.se>,
	"Denis V. Lunev" <den@...nvz.org>
Subject: Re: [Bugme-new] [Bug 10737] New: pktgen procfs problem

Patrick McHardy wrote:
> Andrew Morton wrote:
>> On Sun, 18 May 2008 03:39:42 +0200 Patrick McHardy <kaber@...sh.net> 
>> wrote:
>>
>>  
>>> I've been looking into the same problem, without much success so
>>> far. The problem appears to affect any /proc/net file, but not
>>> files outside of /proc/net, so I'm guessing its net-ns related.
>>> A testcase found by Ben Greear is opening the file multiple times:
>>>
>>> # /tmp/open /proc/net/kpktgen_0
>>>
>>> => refcnt goes to 1
>>>
>>> ^C
>>>
>>> => refcnt goes to 0
>>>
>>> Without ^C and opening the file a second time:
>>>
>>> # /tmp/open /proc/net/kpktgen_0
>>>
>>> => refcnt goes to 2 (sometimes also 11)
>>>
>>> ^C
>>>
>>> => refcnt stays at previous value.
>>>
>>> The refcnt even leaks if the file can't be successfully opened,
>>> for example because of lacking permissions.
>>>     
>>
>> urgh.  Is any of this known to be post-2.6.25?
>>   
> 
> 2.6.25 is also affected. I don't know about earlier kernels.

Some more information: the problem seems to occur only if
the file is opened by two different processes.

I'm starting a bisection now.
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