[PATCH 0/1] tty: release_one_tty() forgets to put pids
From: Oleg Nesterov
Date: Fri Apr 02 2010 - 12:07:36 EST
On 03/31, Andrew Morton wrote:
> On Tue, 30 Mar 2010 16:31:13 +0100
> Catalin Marinas <catalin.marinas@xxxxxxx> wrote:
> > Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
> > > I got below report with 184.108.40.206 .
> > >
> > > 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?
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