linux-kernel - Re: [ 0.003333] BUG: KASAN: use-after-scope in console

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Message-ID: <20171130082909.GA469@jagdpanzerIV>
Date:   Thu, 30 Nov 2017 17:29:09 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Nikitas Angelinas <nikitas.angelinas@...il.com>,
        LKP <lkp@...org>, kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [ 0.003333] BUG: KASAN: use-after-scope in
 console_unlock+0x605/0xcc0

On (11/30/17 09:16), Dmitry Vyukov wrote:
[..]
> > to be honest, this backtrace hardly makes any sense to me.
> >
> > vprintk_emit()
> >  reserve_standard_io_resources()
> >   __flush_tlb_all()
> >    vprintk_emit()
> >     __down_trylock_console_sem()
> >      wake_up_klogd()
> >       console_unlock()
> >
> > I need some help here.
> 
> 
> You can try dirty patch from here:
> https://groups.google.com/d/msg/kasan-dev/iDb5bhcMBT0/55QzwWaHAwAJ
> It should make KASAN print the exact variable name and frame where it
> was allocated.

would be good if Fengguang can try this out. I can't reproduce the
problem on my x86 box (linux-next and Linus's trees both work fine
for me with KASAN + lockdep + TRACE_IRQ).

	-ss