linux-kernel - Re: [3.1-rc6] kmalloc(64) leak from IDE

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Date:	Fri, 23 Sep 2011 10:08:49 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [3.1-rc6] kmalloc(64) leak from IDE

On Fri, Sep 23, 2011 at 9:58 AM, Bernd Schubert
<bernd.schubert@...m.fraunhofer.de> wrote:
> On 09/23/2011 09:21 AM, Borislav Petkov wrote:
>>
>> On Thu, Sep 22, 2011 at 01:23:37PM -0700, Simon Kirby wrote:
>>>
>>> Yes, that seems to have made it stop complaining about the IDE path.
>>
>> Good, thanks for testing. It would be great if you left it running for
>> a couple of days like this to see whether there aren't any other issues
>> with the patch. I'll send it with a proper description to Dave soonish
>> since this is a real bug.
>>
>>> All I see from kmemleak now is:
>>
>> Yep, not IDE-related. Adding linux-acpi.
>
>
>>
>>> unreferenced object 0xe7481a00 (size 256):
>>>   comm "swapper", pid 1, jiffies 4294892509 (age 515.560s)
>>>   hex dump (first 32 bytes):
>>>     00 00 00 28 ff ff ef ff 60 78 4e e7 00 02 00 00  ...(....`xN.....
>>>     47 01 f8 0c f8 0c 01 08 00 00 00 00 0c 03 00 00  G...............
>>>   backtrace:
>>>     [<c1495c47>] kmemleak_alloc+0x27/0x50
>>>     [<c10b3563>] __kmalloc+0xf3/0x1c0
>>>     [<c149e0b0>] pci_acpi_scan_root+0x11e/0x272
>>>     [<c149916b>] acpi_pci_root_add+0x163/0x256
>>>     [<c12adddc>] acpi_device_probe+0x3a/0xf4
>>>     [<c1302e38>] driver_probe_device+0x68/0x160
>>>     [<c1302fb9>] __driver_attach+0x89/0x90
>>>     [<c1302718>] bus_for_each_dev+0x48/0x70
>>>     [<c1302cc9>] driver_attach+0x19/0x20
>>>     [<c130213f>] bus_add_driver+0x17f/0x240
>>>     [<c1303345>] driver_register+0x65/0x120
>>>     [<c12af273>] acpi_bus_register_driver+0x3a/0x3f
>>>     [<c16d421f>] acpi_pci_root_init+0x1b/0x2a
>>>     [<c1001030>] do_one_initcall+0x30/0x160
>>>     [<c16b920b>] kernel_init+0x78/0x10c
>>>     [<c14a1b76>] kernel_thread_helper+0x6/0xd
>>> unreferenced object 0xe74e7860 (size 16):
>>>   comm "swapper", pid 1, jiffies 4294892509 (age 515.560s)
>>>   hex dump (first 16 bytes):
>>>     50 43 49 20 42 75 73 20 30 30 30 30 3a 30 30 00  PCI Bus 0000:00.
>>>   backtrace:
>>>     [<c1495c47>] kmemleak_alloc+0x27/0x50
>>>     [<c10b3563>] __kmalloc+0xf3/0x1c0
>>>     [<c1290cce>] kvasprintf+0x2e/0x50
>>>     [<c1290d01>] kasprintf+0x11/0x20
>>>     [<c149e0da>] pci_acpi_scan_root+0x148/0x272
>>>     [<c149916b>] acpi_pci_root_add+0x163/0x256
>>>     [<c12adddc>] acpi_device_probe+0x3a/0xf4
>>>     [<c1302e38>] driver_probe_device+0x68/0x160
>>>     [<c1302fb9>] __driver_attach+0x89/0x90
>>>     [<c1302718>] bus_for_each_dev+0x48/0x70
>>>     [<c1302cc9>] driver_attach+0x19/0x20
>>>     [<c130213f>] bus_add_driver+0x17f/0x240
>>>     [<c1303345>] driver_register+0x65/0x120
>>>     [<c12af273>] acpi_bus_register_driver+0x3a/0x3f
>>>     [<c16d421f>] acpi_pci_root_init+0x1b/0x2a
>>>     [<c1001030>] do_one_initcall+0x30/0x160
>>>
>>> ...which is probably a separate, non-recurring leak.
>>>
>>>> Also, I'm sure you know IDE is deprecated, so what are the chances of
>>>> moving this box to libata? Also, can you send me your .config pls?
>>>
>>> Yeah, I was going to get around to that eventually. :) Config (and
>>> earlier kmemleak output) here: http://0x.ca/sim/ref/3.1-rc6-blue/
>>
>> Ok, thanks.
>>
>
> I think I reported those already some time ago:
>
> https://lkml.org/lkml/2011/6/21/95

Rats.  And you even posted a patch
(https://lkml.org/lkml/2011/6/21/132).  I was cc'd, but unfortunately
to an old email address that no longer works.  I'll follow up on it
and make sure it's fixed (probably in 3.2 since it's minor and we're
so late in 3.1).

Bjorn
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