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From: Christoph Hellwig <hch@lst.de>
To: Richard Weinberger <richard@nod.at>
Cc: axboe@kernel.dk, linux-um@lists.infradead.org, hch@lst.de,
	Anton Ivanov <anton.ivanov@kot-begemot.co.uk>
Subject: Re: 4.20-rc1 looks broken for UML
Date: Wed, 7 Nov 2018 08:53:18 +0100	[thread overview]
Message-ID: <20181107075318.GA24381@lst.de> (raw)
In-Reply-To: <2177266.HJA9EnQ7lp@blindfold>

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.

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  reply	other threads:[~2018-11-07  7:53 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-05 13:13 4.20-rc1 looks broken for UML Anton Ivanov
2018-11-05 15:22 ` Anton Ivanov
2018-11-05 22:07   ` Richard Weinberger
2018-11-06  7:03     ` Anton Ivanov
2018-11-06 15:00     ` Anton Ivanov
2018-11-06 15:07       ` Anton Ivanov
2018-11-06 18:00         ` Lance Roy
2018-11-06 18:12           ` Anton Ivanov
2018-11-06 17:04       ` Richard Weinberger
2018-11-06 17:25         ` Anton Ivanov
2018-11-06 19:09           ` Anton Ivanov
2018-11-06 19:56             ` Richard Weinberger
2018-11-06 20:49               ` Richard Weinberger
2018-11-07  7:53                 ` Christoph Hellwig [this message]
2018-11-07 10:46                   ` Anton Ivanov
2018-11-07 13:33                     ` Anton Ivanov
2018-11-06 17:42         ` Anton Ivanov

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