lkml.org 
[lkml]   [2009]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [uClinux-dev] Coldfire 5271 hitting BUG_ON(page_count(buddy) != 0);
Hi Lennart,

Lennart Sorensen wrote:
> I am hitting a memory management bug and I would love some hints as to
> how to track down the bug and fix it.
>
> The bug hit is line 423 of page_alloc.c which is:
>
> BUG_ON(page_count(buddy) != 0);
>
> The function it is part of is:
>
> static inline int page_is_buddy(struct page *page, struct page *buddy,
> int order)
> {
> if (!pfn_valid_within(page_to_pfn(buddy)))
> return 0;
>
> if (page_zone_id(page) != page_zone_id(buddy))
> return 0;
>
> if (PageBuddy(buddy) && page_order(buddy) == order) {
> BUG_ON(page_count(buddy) != 0);
> return 1;
> }
> return 0;
> }
>
> I am seeing this both with 2.6.29.1 and 2.6.30 so far. I unfortunately
> haven't poked much at the memory management code, so I am not even sure
> what this is supposed to be doing. The cpu us a coldfire 5271.
>
> I also see crashes causing the kernel to dump lots of hex values.
> Building the kernel with debug enabled unfortunately seems to move things
> around enough to make it just lock up instead without any output.

What are you doing at the time you get this?
Or is it at bootup?

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: gerg@snapgear.com
SnapGear Group, McAfee PHONE: +61 7 3435 2888
825 Stanley St, FAX: +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com


\
 
 \ /
  Last update: 2009-06-26 05:23    [W:2.075 / U:0.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site