Re: [lkp-robot] [printk] c162d5b433: BUG:KASAN:use-after-scope_in_c

[Sergey Senozhatsky]

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