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

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Message-ID: <20100402160447.GA19920@redhat.com>
Date:	Fri, 2 Apr 2010 18:04:47 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>, Greg KH <greg@...ah.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	linux-kernel@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>, stable@...nel.org
Subject: [PATCH 0/1] tty: release_one_tty() forgets to put pids

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?

Oleg.

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