Re: [PATCH] trace: skip hwasan

[Andrey Konovalov]

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.