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    SubjectRe: [Bug #13319] Page allocation failures with b43 and p54usb
    From
    On Sun, Jun 7, 2009 at 5:19 PM, Rik van Riel <riel@redhat.com> wrote:
    > Pekka Enberg wrote:
    >>
    >> Hi Larry,
    >>
    >> On Sun, Jun 7, 2009 at 4:10 PM, Larry Finger <Larry.Finger@lwfinger.net>
    >> wrote:
    >>>
    >>> Rafael J. Wysocki wrote:
    >>>>
    >>>> This message has been generated automatically as a part of a report
    >>>> of recent regressions.
    >>>>
    >>>> The following bug entry is on the current list of known regressions
    >>>> from 2.6.29.  Please verify if it still should be listed and let me know
    >>>> (either way).
    >>>>
    >>>>
    >>>> Bug-Entry     : http://bugzilla.kernel.org/show_bug.cgi?id=13319
    >>>> Subject               : Page allocation failures with b43 and p54usb
    >>>> Submitter     : Larry Finger <Larry.Finger@lwfinger.net>
    >>>> Date          : 2009-04-29 21:01 (40 days old)
    >>>> References    : http://marc.info/?l=linux-kernel&m=124103897101088&w=4
    >>>> Handled-By    : Johannes Berg <johannes@sipsolutions.net>
    >>>
    >>> This bug is extremely difficult to pin down. I cannot reproduce it at
    >>> will. The system has to be up for a long time, which is difficult with
    >>> testing the late RC's of 2.6.30 and the code in wireless-testing so
    >>> that new bugs don't end up in 2.6.31-RCX. That said, it still was in
    >>> 2.6.30-RC6 and I'm not aware of any changes since that would fix it.
    >>>
    >>> My operating kernel is patched with additional diagnostics to help me
    >>> understand why a kmalloc request for a buffer of 1390 bytes suddenly
    >>> ends up as an O(1) request. Unfortunately, I don't have any answers.
    >>
    >> Looking at the out-of-memory trace, there's still memory available but
    >> the pskb_expand_head() allocation is GFP_ATOMIC so there's not much
    >> the page allocator can do here. The amount of memory consumed by
    >> inactive_file is pretty high so maybe the problem is related to the
    >> recent mm/vmscan.c changes. Lets copy some more mm developers and see
    >> if they can help out.
    >
    > That is a very strange trace.  The Mem-Info indicates
    > that the system has more than enough memory free, and
    > also enough memory in higher-order free blocks.
    >
    > This would indicate a bug somewhere in the page
    > allocator - this memory should have been given to this
    > allocation request.

    Aha, I always have difficulties deciphering the traces. But lets
    invite Mel to the party then!

    Pekka
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