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    SubjectRe: memleaks, acpi + ext4 + tty
    On Fri, Aug 28, 2009 at 3:09 PM, Luis R. Rodriguez<> wrote:
    > On Fri, Aug 28, 2009 at 2:50 PM, Luis R. Rodriguez<> wrote:
    >> On Fri, Aug 28, 2009 at 9:52 AM, Luis R. Rodriguez<> wrote:
    >>> On Fri, Aug 28, 2009 at 9:32 AM, Catalin Marinas<> wrote:
    >>>> "Luis R. Rodriguez" <> wrote:
    >>>>> I have an assorted collection of kmemleak reports for acpi, ext4 and
    >>>>> tty, not sure how to read these yet to fix so figure I'd at least post
    >>>>> them. To reproduce I can just dd=/dev/zero to some big file and played
    >>>>> some video.
    >>>> If you do a few echo scan > /sys/kernel/debug/kmemleak, do they
    >>>> disappear (i.e. transient false positives)?
    >>> Sure, I will once on rc8.
    >>>> Which kernel version is this?
    >>> v2.6.31-rc7-33172-gf4a9f9a
    >>> This is from wireless-testing, which has wireless patches on top of
    >>> rc7. John just rebased to rc8 so will give that a shot at work.
    >>>>> unreferenced object 0xffff88003e0015c0 (size 64):
    >>>>>   comm "swapper", pid 1, jiffies 4294892352
    >>>>>   backtrace:
    >>>>>     [<ffffffff81121fad>] create_object+0x13d/0x2d0
    >>>>>     [<ffffffff81122265>] kmemleak_alloc+0x25/0x60
    >>>>>     [<ffffffff81118a03>] kmem_cache_alloc_node+0x193/0x200
    >>>>>     [<ffffffff8152509e>] process_zones+0x70/0x1cd
    >>>>>     [<ffffffff81525230>] pageset_cpuup_callback+0x35/0x92
    >>>>>     [<ffffffff8152c9b7>] notifier_call_chain+0x47/0x90
    >>>>>     [<ffffffff81078549>] __raw_notifier_call_chain+0x9/0x10
    >>>>>     [<ffffffff81523f25>] _cpu_up+0x75/0x130
    >>>>>     [<ffffffff8152403a>] cpu_up+0x5a/0x6a
    >>>>>     [<ffffffff8181969e>] kernel_init+0xcc/0x1ba
    >>>>>     [<ffffffff810130ca>] child_rip+0xa/0x20
    >>>>>     [<ffffffffffffffff>] 0xffffffffffffffff
    >>>> Can't really tell. Maybe a false positive caused by kmemleak not
    >>>> scanning the pgdata node_zones. Can you post your .config file?
    >>> Sure, attached.
    >>>>> unreferenced object 0xffff88003cb5f700 (size 64):
    >>>>>   comm "swapper", pid 1, jiffies 4294892459
    >>>>>   backtrace:
    >>>>>     [<ffffffff81121fad>] create_object+0x13d/0x2d0
    >>>>>     [<ffffffff81122265>] kmemleak_alloc+0x25/0x60
    >>>>>     [<ffffffff81119f3b>] __kmalloc+0x16b/0x250
    >>>>>     [<ffffffff812bb549>] kzalloc+0xf/0x11
    >>>>>     [<ffffffff812bbb53>] acpi_add_single_object+0x58e/0xd3c
    >>>>>     [<ffffffff812bc51c>] acpi_bus_scan+0x125/0x1af
    >>>>>     [<ffffffff81842361>] acpi_scan_init+0xc8/0xe9
    >>>>>     [<ffffffff8184211c>] acpi_init+0x21f/0x265
    >>>>>     [<ffffffff8100a05b>] do_one_initcall+0x4b/0x1b0
    >>>>>     [<ffffffff81819736>] kernel_init+0x164/0x1ba
    >>>>>     [<ffffffff810130ca>] child_rip+0xa/0x20
    >>>>>     [<ffffffffffffffff>] 0xffffffffffffffff
    >>>> I get ACPI reports as well and they may be real leaks. However, I
    >>>> didn't have time to analyse the code (pretty complicated reference
    >>>> counting).
    >>> Heh OK thanks for reviewing them though.
    >>>>> unreferenced object 0xffff880039571800 (size 1024):
    >>>>>   comm "exe", pid 1168, jiffies 4294893410
    >>>>>   backtrace:
    >>>>>     [<ffffffff81121fad>] create_object+0x13d/0x2d0
    >>>>>     [<ffffffff81122265>] kmemleak_alloc+0x25/0x60
    >>>>>     [<ffffffff81119f3b>] __kmalloc+0x16b/0x250
    >>>>>     [<ffffffff811e1d71>] ext4_mb_init+0x1a1/0x590
    >>>>>     [<ffffffff811d2da3>] ext4_fill_super+0x1df3/0x26c0
    >>>>>     [<ffffffff8112774f>] get_sb_bdev+0x16f/0x1b0
    >>>>>     [<ffffffff811c8fd3>] ext4_get_sb+0x13/0x20
    >>>>>     [<ffffffff81127216>] vfs_kern_mount+0x76/0x180
    >>>>>     [<ffffffff8112738d>] do_kern_mount+0x4d/0x130
    >>>>>     [<ffffffff8113fc57>] do_mount+0x307/0x8b0
    >>>>>     [<ffffffff8114028f>] sys_mount+0x8f/0xe0
    >>>>>     [<ffffffff81011f02>] system_call_fastpath+0x16/0x1b
    >>>>>     [<ffffffffffffffff>] 0xffffffffffffffff
    >>>> The ext4 reports are real leaks and patch was posted here -
    >>>> However, it hasn't been merged into
    >>>> mainline yet (I cc'ed Aneesh).
    >>>> The patch is merged in my "kmemleak-fixes" branch on
    >>>> git://
    >>> Will try to suck them out and try them.
    >> OK -- tested rc8 + a pull of your tree into mine. The bootup was
    >> really slow and something was just not going right. After a while
    >> memleak complained it had 8 kmemleak logs but I was not able to get my
    >> system usable enough to cat the file.
    >> In cases like these I wish I would hookup my ctrl-alt-del to kexec() a
    >> safe kernel.
    >> After a long period of time it seems X wished it would start, it tried
    >> and then flashed back to the tty. This kept repeating in a loop.
    >> I am not sure if the culprit was rc8 or the kmemleak branch merge --
    >> I'll find out after I boot into rc8 in a few.
    > rc8 busted my bootup, the issues are present with just
    > wireless-testing. I highly doubt the issues are wireless-testing
    > related so I will not bisect there. Since I am unable to get anything
    > useful from the kernel to determine what may have gone sour, any
    > suggestions on a path to bisect, or should I just do the whole tree?

    I tried 2.6.31-rc8 from hpa's linux-2.6-allstable.git tree instead of
    Linus [1] as I already had that tree, git describe says:


    Testing this would be the same as testing Linus' blessed rc8 --
    correct me I'm wrong. Contrary to what I expected this tree with the
    same config works well!

    I have compiled a fresh checkout of wireless-testing origin/master to
    double check the issue and it is indeed only present on
    wireless-testing. A diff stat between John's merge of 2.6.31-rc8 and
    current master branch on wireless-testing [2] doesn't reveal much
    other than wireless specific stuff, as expected, so it seems this may
    after all be introduced in a recent patches in wireless-testing. I
    still find this a bit odd given I see no others reporting major
    issues. My boot doesn't go very far, it stalls for a while after input
    devices are being detected, then it spits out a kmemleak warning about
    13 kmemleaks. Here's a picture [3]. I didn't bother waiting as I did
    last time for X to try to come up, something is really wrong. I'll
    bisect wireless-testing in the morning, starting with a good marker at
    merge-2009-08-28 as that is when John pulled 2.6.31-rc8 (and I confirm
    a diff stat between that and v2.6.31-rc8 yields nothing as it should)
    and current master as the bad marker. I have 9 steps to go, will leave
    first step compiling overnight.

    [1] git://
    [2] git diff --stat merge-2009-08-28..HEAD
    [4] git diff --stat merge-2009-08-28..v2.6.31-rc8

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      Last update: 2009-08-31 10:27    [W:0.040 / U:11.616 seconds]
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