From: Michal Hocko <mhocko@suse.cz>
To: Gavin Shan <shangw@linux.vnet.ibm.com>
Cc: linux-mm@kvack.org, rientjes@google.com, hannes@cmpxchg.org,
akpm@linux-foundation.org
Subject: Re: [PATCH 3/5] mm/sparse: fix possible memory leak
Date: Tue, 26 Jun 2012 09:14:36 +0200 [thread overview]
Message-ID: <20120626071436.GB6713@tiehlicka.suse.cz> (raw)
In-Reply-To: <20120626061147.GB9483@shangw>
On Tue 26-06-12 14:11:47, Gavin Shan wrote:
> >> With CONFIG_SPARSEMEM_EXTREME, the root memory section descriptors
> >> are allocated by slab or bootmem allocator. Also, the descriptors
> >> might have been allocated and initialized by others. However, the
> >> memory chunk allocated in current implementation wouldn't be put
> >> into the available pool if others have allocated memory chunk for
> >> that.
> >
> >Who is others? I assume that we can race in hotplug because other than
> >that this is an early initialization code. How can others race?
> >
>
> I'm sorry that I don't have the real bug against the issue.
I am not saying the bug is not real. It is just that the changelog
doesn's say how the bug is hit, who is affected and when it has been
introduced. These is essential for stable.
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
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next prev parent reply other threads:[~2012-06-26 7:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-23 15:52 [PATCH 1/5] mm/sparse: check size of struct mm_section Gavin Shan
2012-06-23 15:52 ` [PATCH 2/5] mm/sparse: optimize sparse_index_alloc Gavin Shan
2012-06-25 15:30 ` Michal Hocko
2012-06-26 6:07 ` Gavin Shan
2012-06-26 7:04 ` Michal Hocko
2012-06-26 7:13 ` Gavin Shan
2012-06-23 15:52 ` [PATCH 3/5] mm/sparse: fix possible memory leak Gavin Shan
2012-06-25 15:48 ` Michal Hocko
2012-06-26 6:11 ` Gavin Shan
2012-06-26 7:14 ` Michal Hocko [this message]
2012-06-26 7:17 ` Gavin Shan
2012-06-23 15:52 ` [PATCH 4/5] mm/sparse: more check on mem_section number Gavin Shan
2012-06-26 16:15 ` Dave Hansen
2012-06-27 0:29 ` Gavin Shan
2012-06-23 15:52 ` [PATCH 5/5] mm/sparse: return 0 if root mem_section exists Gavin Shan
2012-06-24 19:18 ` KOSAKI Motohiro
2012-06-25 1:09 ` Gavin Shan
2012-06-25 15:39 ` Michal Hocko
2012-06-25 16:03 ` [PATCH 1/5] mm/sparse: check size of struct mm_section Michal Hocko
2012-06-25 16:35 ` Gavin Shan
2012-06-26 7:39 ` Michal Hocko
2012-06-26 7:48 ` Gavin Shan
2012-06-26 8:06 ` Michal Hocko
2012-06-26 8:24 ` Gavin Shan
2012-06-26 17:57 ` Michal Hocko
2012-06-27 3:01 ` Gavin Shan
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