Re: [ 0.003333] BUG: KASAN: use-after-scope in console_unlock+0x605/0xcc0

Sergey Senozhatsky
2017-11-30T08:29:16Z

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