linux-kernel - Re: [PATCH 34/34] mm: dynamically allocate page->ptl if it cannot be embedded to struct page

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Message-Id: <20131120130626.715B7E0090@blue.fi.intel.com>
Date:	Wed, 20 Nov 2013 15:06:26 +0200 (EET)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrey Wagin <avagin@...il.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 34/34] mm: dynamically allocate page->ptl if it cannot be
 embedded to struct page

Andrey Wagin wrote:
> 2013/11/20 Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>:
> > Andrey Wagin wrote:
> >> Hi Kirill,
> >>
> >> Looks like this patch adds memory leaks.
> >> [  116.188310] kmemleak: 15672 new suspected memory leaks (see
> >> /sys/kernel/debug/kmemleak)
> >> unreferenced object 0xffff8800da45a350 (size 96):
> >>   comm "dracut-initqueu", pid 93, jiffies 4294671391 (age 362.277s)
> >>   hex dump (first 32 bytes):
> >>     07 00 07 00 ad 4e ad de ff ff ff ff 6b 6b 6b 6b  .....N......kkkk
> >>     ff ff ff ff ff ff ff ff 80 24 b4 82 ff ff ff ff  .........$......
> >>   backtrace:
> >>     [<ffffffff817152fe>] kmemleak_alloc+0x5e/0xc0
> >>     [<ffffffff811c34f3>] kmem_cache_alloc_trace+0x113/0x290
> >>     [<ffffffff811920f7>] __ptlock_alloc+0x27/0x50
> >>     [<ffffffff81192849>] __pmd_alloc+0x59/0x170
> >>     [<ffffffff81195ffa>] copy_page_range+0x38a/0x3e0
> >>     [<ffffffff8105a013>] dup_mm+0x313/0x540
> >>     [<ffffffff8105b9da>] copy_process+0x161a/0x1880
> >>     [<ffffffff8105c01b>] do_fork+0x8b/0x360
> >>     [<ffffffff8105c306>] SyS_clone+0x16/0x20
> >>     [<ffffffff81727b79>] stub_clone+0x69/0x90
> >>     [<ffffffffffffffff>] 0xffffffffffffffff
> >>
> >> It's quite serious, because my test host went to panic in a few hours.
> >
> > Sorry for that.
> >
> > Could you test patch below.
> 
> Yes, it works.
> 
> I found this too a few minutes ago:)

Nice

Tested-by ?

-- 
 Kirill A. Shutemov
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