linux-kernel - Re: pidns memory leak

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Message-ID: <4AD2EBC7.2020109@fr.ibm.com>
Date:	Mon, 12 Oct 2009 10:41:43 +0200
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	andrea@...share.com, "Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: pidns memory leak

Sukadev Bhattiprolu wrote:
> Ccing  Andrea's new email id:
>
> Daniel Lezcano [dlezcano@...ibm.com] wrote:
>   
>> Following your explanation I was able to reproduce a simple program  
>> added in attachment. But there is something I do not understand is why  
>> the leak does not appear if I do the 'lstat' (cf. test program) in the  
>> pid 2 context.
>>     
>
> Hmm, are you sure there is no leak with this test program ? If I put back
> the commit (7766755a2f249e7), I do see a leak in all three data structures
> (pid_2, proc_inode, pid_namespace).
>   

Let me clarify :)

The program leaks with the commit 7766755a2f249e7 and does not leak 
without this commit.
This is the expected behaviour and this simple program spots the problem.

I tried to modify the program and I moved the lstat to the process 2 in 
the child namespace. Conforming your analysis, I was expecting to see a 
leak too, but this one didn't occur. I was wondering why, maybe there is 
something I didn't understood in the analysis.

Thanks
  -- Daniel
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