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

[ Lets cc Catalin. ]

On Tue, Jul 14, 2009 at 9:08 AM, Alexey
Fisher<bug-track@fisher-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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