Re: [Xen-devel] CONFIG_SCRUB_DEBUG=y + arm64 + livepatch = Xen BUG at page_alloc.c:738

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

.snip..
> (XEN) Loading dom0 DTB to 0x0000000017e00000-0x0000000017e08265
> (XEN) init_domheap_pages: 0xb87b1->0xb87bc
> (XEN) init_heap_pages: 0xb87b1 -> 0xb87bc
> (XEN) init_domheap_pages: 0xb88f1->0xb98ae
> (XEN) init_heap_pages: 0xb88f1 -> 0xb98ae     <- so the memory is from here
> 
> (XEN) Scrubbing Free RAM on 1 nodes using 8 CPUs
> (XEN) Initial low memory virq threshold set at 0x4000 pages.
> (XEN) Scrubbing Free RAM on 1 nodes using 8 CPUs

I expanded this a bit to include:

(XEN) Initial low memory virq threshold set at 0x4000 pages.                    
(XEN) NODE0 start=0x0 pages=579306, max_page=0xc0000                            
(XEN) NODE0:  #0  #1  #2  #3  #4  #5  #6  #7  (total=8)                         
(XEN) NODE0 start=0x0, per_cpu=72413, rem=2, end=0x8d6ea
                                                 ^^^^^^^^  that is the end of 
memory, but
0xb98ae > 0x8d6ae.

end = min(node_start_pfn(i) + node_spanned_pages(i), max_page);         
          0                   0x8D6EA                0xc0000


Oh:

/* XXX: implement NUMA support */
#define node_spanned_pages(nid) (total_pages)

<facepalm>

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