On Tue, 2017-06-20 at 23:58 +1000, Nicholas Piggin wrote:
> Emergency stacks have their thread_info mostly uninitialised, which in
> particular means garbage preempt_count values.
>
> Emergency stack code runs with interrupts disabled entirely, and is
> used very rarely, so this has been unnoticed
On Wed, 21 Jun 2017 12:01:37 +1000
Michael Ellerman wrote:
> Nicholas Piggin writes:
>
> > diff --git a/arch/powerpc/include/asm/thread_info.h
> > b/arch/powerpc/include/asm/thread_info.h
> > index a941cc6fc3e9..5995e4b2996d 100644
> > --- a/arch/powerpc/include/asm/thread_info.h
> > +++ b/arc
Nicholas Piggin writes:
> diff --git a/arch/powerpc/include/asm/thread_info.h
> b/arch/powerpc/include/asm/thread_info.h
> index a941cc6fc3e9..5995e4b2996d 100644
> --- a/arch/powerpc/include/asm/thread_info.h
> +++ b/arch/powerpc/include/asm/thread_info.h
> @@ -62,6 +63,24 @@ struct thread_info
Emergency stacks have their thread_info mostly uninitialised, which in
particular means garbage preempt_count values.
Emergency stack code runs with interrupts disabled entirely, and is
used very rarely, so this has been unnoticed so far. It was found by a
proposed new powerpc watchdog that takes
