Re: [Bug #14016] mm/ipw2200 regression

Johannes Weiner
2009-08-26T08:28:33Z

[Cc netdev]

On Wed, Aug 26, 2009 at 09:09:44AM +0300, Pekka Enberg wrote:
> On Tue, Aug 25, 2009 at 11:34 PM, Rafael J. Wysocki<rjw@sisk.pl> 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 2.6.30.  Please verify if it still should be listed and let me know
> > (either way).
> >
> > Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=14016
> > Subject         : mm/ipw2200 regression
> > Submitter       : Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> > Date            : 2009-08-15 16:56 (11 days old)
> > References      : http://marc.info/?l=linux-kernel&m=125036437221408&w=4
>
> If am reading the page allocator dump correctly, there's plenty of
> pages left but we're unable to satisfy an order 6 allocation. There's
> no slab allocator involved so the page allocator changes that went
> into 2.6.31 seem likely. Mel, ideas?

It's an atomic order-6 allocation, the chances for this to succeed
after some uptime become infinitesimal. The chunks > order-2 are
pretty much exhausted on this dump.

64 pages, presumably 256k, for fw->boot_size while current ipw
firmware images have ~188k. I don't know jack squat about this
driver, but given the field name and the struct:

struct ipw_fw {
__le32 ver;
__le32 boot_size;
__le32 ucode_size;
__le32 fw_size;
u8 data[0];
};

fw->boot_size alone being that big sounds a bit fishy to me.

Hannes