linux-kernel - Re: [2.6.31] Memory leak in load

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Date:	Fri, 11 Sep 2009 19:58:46 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	catalin.marinas@....com
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [2.6.31] Memory leak in load_module()?

Hello.

Catalin Marinas wrote:
> It could be but isn't stack tracing enabled on your system? The
> backtrace doesn't seem very useful.

Since the kernel hangs after printing

[    0.000999]  memory used by lock dependency info: 3743 kB
[    0.000999]  per task-struct memory footprint: 1920 bytes

if I enable almost all debug options and change
CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE to 2000,
I disabled almost all debug options.

OK. Here is the output with CONFIG_FRAME_POINTER=y .
Do I need to enable some other debug options?

unreferenced object 0xdd7c1718 (size 32):
  comm "insmod", pid 2859, jiffies 4294757534
  backtrace:
    [<c048a210>] create_object+0x135/0x202
    [<c048a302>] kmemleak_alloc+0x25/0x49
    [<c04865bd>] kmemleak_alloc_recursive+0x1c/0x22
    [<c0486e27>] __kmalloc_track_caller+0x66/0xb3
    [<c0473980>] kstrdup+0x2c/0x4e
    [<c044716a>] setup_modinfo_srcversion+0x12/0x1b
    [<c0448725>] load_module+0x866/0x124a
    [<c0449180>] sys_init_module+0x49/0x1b9
    [<c0402a24>] sysenter_do_call+0x12/0x22
    [<ffffffff>] 0xffffffff

Regards.
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