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

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Date:   Fri, 1 Dec 2017 10:32:30 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.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 22:30), Fengguang Wu wrote:
> On Thu, Nov 30, 2017 at 05:29:09PM +0900, Sergey Senozhatsky wrote:
> > 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).
> 
> Attached is the dmesg with Dmitry's patch. The new output is:
> 
> [    0.003333] frame offset: 32
> [    0.003333] desc: '2 32 4 3 __u 96 8 3 __u '
> [    0.003333] func: console_unlock+0x0/0xcc0

thanks!

	-ss