linux-kernel - Re: kmemleak errors

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Date:	Thu, 15 Oct 2009 11:39:30 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Peter Teoh <htmldeveloper@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: kmemleak errors

Peter Teoh <htmldeveloper@...il.com> wrote:
> cat /sys/kernel/debug/kmemleak gave:
>
> unreferenced object 0xffff8800bd864000 (size 40):
>   comm "swapper", pid 0, jiffies 4294937296
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 70 40 86 bd 00 88 ff ff  ........p@......
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81ef55b6>] kmemleak_alloc+0x73/0xd8
>     [<ffffffff81154d66>] kmem_cache_alloc+0xf7/0x15a
>     [<ffffffff82b2b88a>] debug_objects_mem_init+0x71/0x234
>     [<ffffffff82afef26>] start_kernel+0x356/0x414
>     [<ffffffff82afe2a9>] x86_64_start_reservations+0xb9/0xd4
>     [<ffffffff82afe3b2>] x86_64_start_kernel+0xee/0x109
>     [<ffffffffffffffff>] 0xffffffffffffffff

If run

  echo scan > /sys/kernel/debug/kmemleak

a few times, do they disappear? I think the debug_objects reports are
false positives but couldn't figure why kmemleak cannot track
them. I'll look again at them and maybe add an annotation
(kmemleak_not_leak).

-- 
Catalin
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