Messages in this thread | | | Date | Mon, 01 Jul 2013 09:29:02 +0100 | From | Alex Bligh <> | Subject | Re: kernel panic in skb_copy_bits |
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Joe,
> Do you know if have a fix for above? so far we also suspected the > grant page be unmapped earlier, we using 4.1 stable during our test.
A true fix? No, but I posted a patch set (see later email message for a link) that you could forward port. The workaround is:
>> A workaround is to turn off O_DIRECT use by Xen as that ensures >> the pages are copied. Xen 4.3 does this by default. >> >> I believe fixes for this are in 4.3 and 4.2.2 if using the >> qemu upstream DM. Note these aren't real fixes, just a workaround >> of a kernel bug. > > The guest is pvm, and disk model is xvbd, guest config file as below: ... > I think this only for pvhvm/hvm?
I don't have much experience outside pvhvm/hvm, but I believe it should work for any device.
Testing was simple - just find all (*) the references to O_DIRECT in your device model and remove them!
(*)=you could be less lazy than me and find the right ones.
I am guessing it will be the same ones though.
-- Alex Bligh
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