Re: [PATCH] trace: skip hwasan

From: Steven Rostedt
Date: Mon Feb 18 2019 - 12:23:28 EST


On Mon, 18 Feb 2019 16:56:44 +0100
Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote:

> On Mon, Feb 18, 2019 at 4:53 PM Qian Cai <cai@xxxxxx> wrote:
> >
> >
> >
> > On 2/18/19 10:25 AM, Andrey Konovalov wrote:
> > > On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <cai@xxxxxx> wrote:
> > >>
> > >> Enabling function tracer with CONFIG_KASAN_SW_TAGS=y (hwasan) tracer
> > >> causes the whole system frozen on ThunderX2 systems with 256 CPUs,
> > >> because there is a burst of too much pointer access, and then KASAN will
> > >> dereference each byte of the shadow address for the tag checking which
> > >> will kill all the CPUs.
> > >
> > > Hi Qian,
> > >
> > > Could you check if adding "CFLAGS_REMOVE_tags.o = -pg" into
> > > mm/kasan/Makefile helps with that?
> >
> > Yes, you nailed it!
>
> Great! I'll send the patch.

OK, then I'll ignore the original patch in this thread.

-- Steve