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

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Date:	Sun, 18 May 2008 14:06:56 +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

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.


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