From mboxrd@z Thu Jan  1 00:00:00 1970
From: Arnd Hannemann <hannemann@nets.rwth-aachen.de>
Subject: Re: xen dom0 2.6.32.15 kernel BUG at
	drivers/xen/grant-table.c:583
Date: Mon, 14 Jun 2010 13:04:58 +0200
Message-ID: <4C160CDA.9050204@nets.rwth-aachen.de>
References: <4C15E000.7060509@nets.rwth-aachen.de> <4C160ADD.80609@goop.org>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
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Am 14.06.2010 12:56, schrieb Jeremy Fitzhardinge:
> On 06/14/2010 08:53 AM, Arnd Hannemann wrote:
>> Hi,
>>
>> we have regular but hard to reproduce (wait for a day or two starting domUs) kernel panics (see below) with latest
>> "xen/stable-2.6.32.x" git tree.
>>   
> 
> Are you sure its the latest?  There were some problems with the
> tasklet-based netback patches which I since reverted.  (And I now have
> fixes for, so I'll reapply them soon.)

Yes its latest. git log shows this commit as top:

commit 57028f01dcd263bcee41e00ddcda167a082ae075
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Date:   Wed Jun 9 11:29:42 2010 -0700

    Revert "Merge branch 'xen/dom0/backend/netback-tasklet' into xen/next"

    This reverts commit 528ea798f02ccb03023e72cbda665ed5c3eec6b1, reversing
    changes made to 6c004dff353a3588684bff1c0eac8b14a1b6f67e.


The Panic seems to originate from this code snippet:
        if (!xen_feature(XENFEAT_auto_translated_physmap)) {
                set_phys_to_machine(page_to_pfn(new_page), INVALID_P2M_ENTRY);

                mmu.ptr = (new_mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE;
                mmu.val = pfn;
                err = HYPERVISOR_mmu_update(&mmu, 1, NULL, DOMID_SELF);
                BUG_ON(err);
        }

I will try if the patch Stefano Stabellini mentioned fixes the problem...


Thanks,
Arnd