linux-kernel - Re: [PATCH 0/1] tty: release_one

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Message-Id: <201004031140.BBH39566.OFFJFVHMOtQOSL@I-love.SAKURA.ne.jp>
Date:	Sat, 3 Apr 2010 11:40:19 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	oleg@...hat.com, akpm@...ux-foundation.org, alan@...ux.intel.com,
	greg@...ah.com, torvalds@...ux-foundation.org
Cc:	catalin.marinas@....com, linux-kernel@...r.kernel.org,
	serue@...ibm.com, ebiederm@...ssion.com, sukadev@...ibm.com,
	stable@...nel.org
Subject: Re: [PATCH 0/1] tty: release_one_tty() forgets to put pids

Oleg Nesterov wrote:
> Add cc's.
> 
> On 03/31, Andrew Morton wrote:
> >
> > On Tue, 30 Mar 2010 16:31:13 +0100
> > Catalin Marinas <catalin.marinas@....com> wrote:
> >
> > > Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> > > > I got below report with 2.6.33.1 .
> > > >
> > > > unreferenced object 0xde144600 (size 64):
> > > >   comm "init", pid 1, jiffies 4294678101 (age 291.508s)
> > >
> > > [... snip ...]
> > >
> > > I reported similar leaks last year -
> > > http://lkml.org/lkml/2009/7/8/422. There is some analysis in the thread
> > > above of the reference counting but I couldn't figure out where it goes
> > > wrong. It looks to me like there isn't any reference to a struct pid
> > > block but its reference count is 2.
> > >
> > > There is a bugzilla entry as well -
> > > https://bugzilla.kernel.org/show_bug.cgi?id=13868
> 
> OK. I do not undertand ttys, absolutely. This means the patch
> should not be applied without acks. And in fact I feel the patch
> probably fixes the symptom, not the problem. But the logic in
> disassociate_ctty() is beyond my understanding.
> 
> However, I think it is easy to explain the leak.
> 
> Catalin, Tetsuo, could you try this patch?
> 
I confirmed using 2.6.34-rc3 that this patch solved the leak.

Thank you.

> Oleg.
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