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Date: Fri, 23 Sep 2011 19:49:04 +0200 From: Bernd Schubert <bernd.schubert@...m.fraunhofer.de> To: Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org Subject: Re: [3.1-rc6] kmalloc(64) leak from IDE On 09/23/2011 06:40 PM, Bjorn Helgaas wrote: > On Fri, Sep 23, 2011 at 10:34 AM, Bernd Schubert > <bernd.schubert@...m.fraunhofer.de> wrote: >> On 09/23/2011 06:08 PM, Bjorn Helgaas wrote: >>> >>> 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). >> >> Ah great, I thought you are simply too busy to look into it. We are all just >> changing our mail addresses too often :) >> >> Do you mind if I ping you directly once kernel.org is up again? We have a >> few test systems here, that fail to boot with recent kernels (just a system >> hard reset). The issue was introduced in between 2.6.27 and 2.6.32 and it is >> pci mmconfig related, probably due to a troublesome acpi bios. I filled a >> bugzilla some time ago and never got a responds on it. But I also need to >> update it with my latest finding... > > Please do, and you don't need to wait for kernel.org to come back > (though it'd be good to include any bugzilla URLs if you know them). > Just email me and copy linux-pci (since it seems PCI > MMCONFIG-related), and we can try to make some progress. It's very > important to fix regressions as quickly as possible. Hmm, I tried to analyze it already and I don't have the text and attachments I sent to the bugzilla ready on my disk to send it again. So it would be really good if we could wait just a little bit longer (I posted it several months ago already). I also found some kind of workaround for us and need the systems right now for our own development... Thanks, Bernd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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