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

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Message-ID: <tnxhbv97rt6.fsf@pc1117.cambridge.arm.com>
Date:	Fri, 11 Sep 2009 10:29:25 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [2.6.31] Memory leak in load_module()?

Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:
> I changed CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE to 2000 and did
>
> # insmod /lib/modules/2.6.31/kernel/drivers/edac/r82600_edac.ko
> insmod: error inserting '/lib/modules/2.6.31/kernel/drivers/edac/r82600_edac.ko': -1 Unknown symbol in module
> # echo scan > /sys/kernel/debug/kmemleak
> # dmesg
> r82600_edac: Unknown symbol edac_mc_del_mc
> r82600_edac: Unknown symbol edac_mc_add_mc
> r82600_edac: Unknown symbol edac_pci_create_generic_ctl
> r82600_edac: Unknown symbol edac_mc_alloc
> r82600_edac: Unknown symbol edac_mc_find_csrow_by_page
> r82600_edac: Unknown symbol edac_mc_free
> r82600_edac: Unknown symbol edac_mc_handle_ce
> r82600_edac: Unknown symbol edac_mc_handle_ue
> r82600_edac: Unknown symbol edac_pci_release_generic_ctl
> kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
> # tail -n 4 /sys/kernel/debug/kmemleak
> unreferenced object 0xd643a788 (size 32):
>   comm "insmod", pid 2854, jiffies 4294791099
>   backtrace:
>     [<ffffffff>] 0xffffffff
>
> Is this real memory leak?

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

-- 
Catalin
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