From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from verein.lst.de ([213.95.11.211] helo=newverein.lst.de) by casper.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gKIea-0006L4-GT for linux-um@lists.infradead.org; Wed, 07 Nov 2018 07:53:33 +0000 Date: Wed, 7 Nov 2018 08:53:18 +0100 From: Christoph Hellwig Subject: Re: 4.20-rc1 looks broken for UML Message-ID: <20181107075318.GA24381@lst.de> References: <4a096c4f-6552-dbcb-676b-a87306dde07a@kot-begemot.co.uk> <6298063.A9SzxUBULK@blindfold> <2177266.HJA9EnQ7lp@blindfold> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2177266.HJA9EnQ7lp@blindfold> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: Richard Weinberger Cc: axboe@kernel.dk, linux-um@lists.infradead.org, hch@lst.de, Anton Ivanov On Tue, Nov 06, 2018 at 09:49:45PM +0100, Richard Weinberger wrote: > Christoph, > > Anton found a problem in your "ubd: remove use of blk_rq_map_sg" patch. > With CONFIG_DEBUG_PAGEALLOC enabled, the ubd driver crashes because it tries > to deref address 0x12345678, which is the poison from store_stackinfo(). > > Please see below for more info. > Can it be that your change introduced a use-after-free bug in UML's block driver? Sounds like it. But I'll need some more time to debug it. _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um