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    SubjectRe: xfslogd-spinlock bug?
    Date

    ----- Original Message -----
    From: "David Chinner" <dgc@sgi.com>
    To: "Haar János" <djani22@netcenter.hu>
    Cc: "David Chinner" <dgc@sgi.com>; <linux-xfs@oss.sgi.com>;
    <linux-kernel@vger.kernel.org>
    Sent: Monday, December 18, 2006 11:36 PM
    Subject: Re: xfslogd-spinlock bug?


    > On Mon, Dec 18, 2006 at 09:17:50AM +0100, Haar János wrote:
    > > From: "David Chinner" <dgc@sgi.com>
    > > > > The NBD serves through eth1, and it is on the CPU3, but the ide0 is
    on
    > > the
    > > > > CPU0.
    > > >
    > > > I'd say your NBD based XFS filesystem is having trouble.
    > > >
    > > > > > Are you using XFS on a NBD?
    > > > >
    > > > > Yes, on the 3. source.
    > > >
    > > > Ok, I've never heard of a problem like this before and you are doing
    > > > something that very few ppl are doing (i.e. XFS on NBD). I'd start
    > > > Hence I'd start by suspecting a bug in the NBD driver.
    > >
    > > Ok, if you have right, this also can be in context with the following
    issue:
    > >
    > > http://download.netcenter.hu/bughunt/20061217/messages.txt (10KB)
    >
    > Which appears to be a crash in wake_up_process() when doing memory
    > reclaim (waking the xfsbufd).

    Sorry, can you translate it to "poor mans language"? :-)
    This is a different bug?


    >
    > > > > > > Dec 16 12:08:36 dy-base RSP: 0018:ffff81011fdedbc0 EFLAGS:
    00010002
    > > > > > > Dec 16 12:08:36 dy-base RAX: 0000000000000033 RBX:
    6b6b6b6b6b6b6b6b
    > > RCX:
    > > > > >
    ^^^^^^^^^^^^^^^^
    > > > > > Anyone recognise that pattern?
    >
    > Ok, I've found this pattern:
    >
    > #define POISON_FREE 0x6b
    >
    > Can you confirm that you are running with CONFIG_DEBUG_SLAB=y?

    Yes, i build with this option enabled.
    Is this wrong?

    >
    > If so, we have a use after free occurring here and it would also
    > explain why no-one has reported it before.
    >
    > FWIW, can you turn on CONFIG_XFS_DEBUG=y and see if that triggers
    > a different bug check prior to the above dump?

    [root@X64 linux-2.6.19]# make bzImage
    scripts/kconfig/conf -s arch/x86_64/Kconfig
    .config:7:warning: trying to assign nonexistent symbol XFS_DEBUG

    I have missed something?


    Thanks,

    Janos

    >
    > Cheers,
    >
    > Dave.
    > --
    > Dave Chinner
    > Principal Engineer
    > SGI Australian Software Group

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