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

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Date:	Fri, 23 Sep 2011 09:21:18 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Simon Kirby <sim@...tway.ca>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [3.1-rc6] kmalloc(64) leak from IDE

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.

-- 
Regards/Gruss,
    Boris.
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