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Date: Fri, 2 Mar 2018 00:19:34 +0900
From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Petr Mladek <pmladek@suse.com>, kernel test robot <shun.hao@intel.com>,
        Cong Wang <xiyou.wangcong@gmail.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mgorman@suse.de>,
        Michal Hocko <mhocko@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jan Kara <jack@suse.cz>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Byungchul Park <byungchul.park@lge.com>, Tejun Heo <tj@kernel.org>,
        Pavel Machek <pavel@ucw.cz>, Steven Rostedt <rostedt@goodmis.org>,
        LKML <linux-kernel@vger.kernel.org>, LKP <lkp@01.org>,
        kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [lkp-robot] [printk] c162d5b433: BUG:KASAN:use-after-scope_in_c
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On (03/01/18 09:51), Dmitry Vyukov wrote:
> > https://marc.info/?l=linux-kernel&m=151200883525299
> >
> > [..]
> >> I feel lost a bit.
> >
> > Yeah... can't understand what's going on there.
> >
> > The last time kasan didn't like this part
> >
> > [    0.003333]  ? console_unlock+0x605/0xcc0:
> >                               atomic_read at arch/x86/include/asm/atomic.h:27
> >                                (inlined by) static_key_count at include/linux/jump_label.h:191
> >                                (inlined by) static_key_false at include/linux/jump_label.h:201
> >                                (inlined by) trace_console_rcuidle at include/trace/events/printk.h:10
> >                                (inlined by) call_console_drivers at kernel/printk/printk.c:1556
> >                                (inlined by) console_unlock at kernel/printk/printk.c:2233
> >
> > complaining that there was a write of size 4... at atomic_read().
> 
> Hi Sergey,
> 
> Where is that report?
> I doubt that KASAN has instrumented a read as a write (at least there
> are no such known cases), so perhaps it's pointing to some other
> memory access.

Hello Dmitry,

I believe it's this one

https://marc.info/?l=linux-kernel&m=151200883525299


	-ss