linux-kernel - Re: [PATCH] Revert "i2c: dev: switch from register

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Date:	Sat, 28 May 2016 12:15:59 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Erico Nunes <erico.nunes@...acom.ind.br>,
	kernel-janitors@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev
 API"

On Sat, May 28, 2016 at 11:07:47AM +0200, Wolfram Sang wrote:
> This reverts commit d6760b14d4a1243f918d983bba1e35c5a5cd5a6d. When
> hitting Linus' tree, buildbots ran additional checks and found boot
> problems. Although Dan Carpenter provided an obvious fix already, I
> still could not reproduce one problem manually (at least not on a
> Saturday morning). So we'll try again later after some more
> investigation.
> 

These kinds of use after frees don't always cause a runtime problem.  I
found it using static analysis, but I bet you could detect it if you
enabled kasan.  The other option is to enable PAGE_POISONING?

regards,
dan carpenter