linux-kernel - Re: 60 memory leaks.. or is it some thing wrong with kmemleak?

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Message-ID: <84144f020907140019g511723dctb541f6333d1a082b@mail.gmail.com>
Date:	Tue, 14 Jul 2009 10:19:41 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Alexey Fisher <bug-track@...her-privat.net>
Cc:	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: 60 memory leaks.. or is it some thing wrong with kmemleak?

Hi Alexey,

[ Lets cc Catalin. ]

On Tue, Jul 14, 2009 at 9:08 AM, Alexey
Fisher<bug-track@...her-privat.net> wrote:
> Hallo all,
> i enabled kmemleak and now i get a lot of them...

Which kernel version is this? You almost definitely want to try out
2.6.31-rc3 which has tons of bug fixes to kmemleak.

> i do not know if this are real or some noise..
> most of the about mounting ext4
>
> unreferenced object 0xffff880133c63800 (size 1024):
>  comm "exe", pid 1521, jiffies 4294894652
>  backtrace:
>    [<ffffffff810f8f36>] create_object+0x126/0x2b0
>    [<ffffffff810f91d5>] kmemleak_alloc+0x25/0x60
>    [<ffffffff810f32a3>] __kmalloc+0x113/0x200
>    [<ffffffff811aa061>] ext4_mb_init+0x1b1/0x570
>    [<ffffffff8119b3d2>] ext4_fill_super+0x1de2/0x26d0
>    [<ffffffff810fe40f>] get_sb_bdev+0x16f/0x1b0
>    [<ffffffff811912f3>] ext4_get_sb+0x13/0x20
>    [<ffffffff810fdee6>] vfs_kern_mount+0x76/0x180
>    [<ffffffff810fe05d>] do_kern_mount+0x4d/0x120
>    [<ffffffff81115e17>] do_mount+0x307/0x880
>    [<ffffffff8111641f>] sys_mount+0x8f/0xe0
>    [<ffffffff8100b66b>] system_call_fastpath+0x16/0x1b
>    [<ffffffffffffffff>] 0xffffffffffffffff
> unreferenced object 0xffff8801334db0c0 (size 192):
>  comm "exe", pid 1521, jiffies 4294894652
>  backtrace:
>    [<ffffffff810f8f36>] create_object+0x126/0x2b0
>    [<ffffffff810f91d5>] kmemleak_alloc+0x25/0x60
>    [<ffffffff810f32a3>] __kmalloc+0x113/0x200
>    [<ffffffff811aa061>] ext4_mb_init+0x1b1/0x570
>    [<ffffffff8119b3d2>] ext4_fill_super+0x1de2/0x26d0
>    [<ffffffff810fe40f>] get_sb_bdev+0x16f/0x1b0
>    [<ffffffff811912f3>] ext4_get_sb+0x13/0x20
>    [<ffffffff810fdee6>] vfs_kern_mount+0x76/0x180
>    [<ffffffff810fe05d>] do_kern_mount+0x4d/0x120
>    [<ffffffff81115e17>] do_mount+0x307/0x880
>    [<ffffffff8111641f>] sys_mount+0x8f/0xe0
>    [<ffffffff8100b66b>] system_call_fastpath+0x16/0x1b
>    [<ffffffffffffffff>] 0xffffffffffffffff
>
>
> and other seems like about control group:
>
>
> unreferenced object 0xffff88013b852440 (size 544):
>  comm "swapper", pid 0, jiffies 4294892296
>  backtrace:
>    [<ffffffff810f8f36>] create_object+0x126/0x2b0
>    [<ffffffff810f91d5>] kmemleak_alloc+0x25/0x60
>    [<ffffffff810f24f3>] kmem_cache_alloc+0xf3/0x170
>    [<ffffffff8121deff>] idr_pre_get+0x5f/0x90
>    [<ffffffff810898c5>] get_new_cssid+0x65/0x120
>    [<ffffffff8174f7a3>] cgroup_init+0x6f/0x109
>    [<ffffffff8173ad21>] start_kernel+0x3a6/0x3ca
>    [<ffffffff8173a315>] x86_64_start_reservations+0x125/0x129
>    [<ffffffff8173a3fd>] x86_64_start_kernel+0xe4/0xeb
>    [<ffffffffffffffff>] 0xffffffffffffffff
> unreferenced object 0xffff88013b852660 (size 544):
>  comm "swapper", pid 0, jiffies 4294892296
>  backtrace:
>    [<ffffffff810f8f36>] create_object+0x126/0x2b0
>    [<ffffffff810f91d5>] kmemleak_alloc+0x25/0x60
>    [<ffffffff810f24f3>] kmem_cache_alloc+0xf3/0x170
>    [<ffffffff8121deff>] idr_pre_get+0x5f/0x90
>    [<ffffffff810898c5>] get_new_cssid+0x65/0x120
>    [<ffffffff8174f7a3>] cgroup_init+0x6f/0x109
>    [<ffffffff8173ad21>] start_kernel+0x3a6/0x3ca
>    [<ffffffff8173a315>] x86_64_start_reservations+0x125/0x129
>    [<ffffffff8173a3fd>] x86_64_start_kernel+0xe4/0xeb
>    [<ffffffffffffffff>] 0xffffffffffffffff
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