linux-kernel - Re: [lkp-robot] [printk] c162d5b433: BUG:KASAN:use-after-scope_in

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Message-ID: <20180302051046.GA899@jagdpanzerIV>
Date:   Fri, 2 Mar 2018 14:10:46 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        kernel test robot <shun.hao@...el.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Byungchul Park <byungchul.park@....com>,
        Tejun Heo <tj@...nel.org>, Pavel Machek <pavel@....cz>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [lkp-robot] [printk] c162d5b433: BUG:KASAN:use-after-scope_in_c

On (03/01/18 16:53), Dmitry Vyukov wrote:
[..]
> > Hello Dmitry,
> >
> > I believe it's this one
> >
> > https://marc.info/?l=linux-kernel&m=151200883525299
> 
> 
> Thanks, but now that I debugged this one, I think that one is the same issue.
> Amusingly a write in READ_ONCE is actually legitimate because
> GCC_PLUGIN_STRUCTLEAK emits an initializing write for __u variable in
> READ_ONCE implementation.

Thanks. It's great to have you in Cc ;)

	-ss