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From: Dan Carpenter <dan.carpenter@oracle.com>
To: KY Srinivasan <kys@microsoft.com>
Cc: Sitsofe Wheeler <sitsofe@gmail.com>,
	Dexuan Cui <decui@microsoft.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>
Subject: Re: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write)
Date: Fri, 29 Aug 2014 12:49:45 +0300	[thread overview]
Message-ID: <20140829094945.GA5122@mwanda> (raw)
In-Reply-To: <51ae44fcae424365a6d78f3597175d77@BY2PR0301MB0711.namprd03.prod.outlook.com>

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
sizeof(u64).

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.

regards,
dan carpenter


  parent reply	other threads:[~2014-08-29  9:50 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-20  9:26 [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer_write) Sitsofe Wheeler
2014-08-20 11:15 ` Dexuan Cui
2014-08-20 11:40   ` Sitsofe Wheeler
2014-08-20 13:42     ` Dexuan Cui
2014-08-25 14:02 ` Dexuan Cui
2014-08-25 17:41   ` Sitsofe Wheeler
2014-08-26 10:30     ` Dexuan Cui
2014-08-27 10:44       ` Sitsofe Wheeler
2014-08-27 11:30         ` Dexuan Cui
2014-08-27 12:15           ` Sitsofe Wheeler
2014-08-27 14:14             ` Dexuan Cui
2014-08-27 16:19               ` Sitsofe Wheeler
2014-08-27 18:45                 ` KY Srinivasan
2014-08-27 22:57                   ` Sitsofe Wheeler
2014-08-27 23:13                     ` KY Srinivasan
2014-08-28  3:21                       ` Dexuan Cui
2014-08-28  3:41                         ` KY Srinivasan
2014-08-28 12:48                         ` Sitsofe Wheeler
2014-08-29  3:39                           ` Dexuan Cui
2014-08-29  9:49                   ` Dan Carpenter [this message]
2014-08-29 10:16                     ` Dexuan Cui
2014-08-29 10:24                       ` Dan Carpenter
2014-08-29 11:20                         ` Sitsofe Wheeler
2014-08-29 14:48                           ` Dexuan Cui

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