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Date:	Fri, 29 Aug 2014 12:49:45 +0300
From:	Dan Carpenter <>
To:	KY Srinivasan <>
Cc:	Sitsofe Wheeler <>,
	Dexuan Cui <>,
	Greg Kroah-Hartman <>,
	Haiyang Zhang <>,
	"" <>,
	"" <>
Subject: Re: [PANIC, hyperv] BUG: unable to handle kernel paging request at
 ffff880077800004 (hv_ringbuffer_write)

It's sort of weird that this is an alignment issue.  The config that
was posted earlier was an x86_64 config and on that system then the
pointers from kmalloc() should already be aligned correctly at

Earlier I said I suspected the code is racy, so possibly changing from
kmalloc() to get_zeroed_page() just changes the timing enough so we
don't see the race condition.

dan carpenter

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