Re: [Xen-devel] dom0 linux 3.6.0-rc4, crash due to ballooning althoug dom0_mem=X, max:X set

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

On Tue, Sep 04, 2012 at 06:37:57PM +0200, Sander Eikelenboom wrote:
> Hi Konrad,
> 
> This seems to happen only on a intel machine i'm trying to setup as a 
> development machine (haven't seen it on my amd).
> It boots fine, i have dom0_mem=1024M,max:1024M set, the machine has 2G of mem.
> 
> Dom0 and guest kernel are 3.6.0-rc4 with config:
> [*] Xen memory balloon driver
> [*]   Scrub pages before returning them to system

Can you also try this patch out and provide the full log (bootup and such). 
Thanks!

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 31ab82f..871a93c 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -355,8 +355,12 @@ static enum bp_state increase_reservation(unsigned long 
nr_pages)
                BUG_ON(page == NULL);
 
                pfn = page_to_pfn(page);
-               BUG_ON(!xen_feature(XENFEAT_auto_translated_physmap) &&
-                      phys_to_machine_mapping_valid(pfn));
+               if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+                       if (phys_to_machine_mapping_valid(pfn)) {
+                               printk(KERN_DEBUG "%lx is %lx!\n", pfn, 
get_phys_to_machine(pfn));
+                               continue;
+                       }
+               }
 
                set_phys_to_machine(pfn, frame_list[i]);
 
@@ -572,6 +576,7 @@ static void __init balloon_add_region(unsigned long 
start_pfn,
         */
        extra_pfn_end = min(max_pfn, start_pfn + pages);
 
+       printk(KERN_INFO "%s: [%lx->%lx]\n", __func__, start_pfn, 
extra_pfn_end);
        for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
                page = pfn_to_page(pfn);
                /* totalram_pages and totalhigh_pages do not

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