linux-kernel - Re: [PATCH] trace: skip hwasan

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Date:   Mon, 18 Feb 2019 12:23:22 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Qian Cai <cai@....pw>, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] trace: skip hwasan

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

> On Mon, Feb 18, 2019 at 4:53 PM Qian Cai <cai@....pw> wrote:
> >
> >
> >
> > On 2/18/19 10:25 AM, Andrey Konovalov wrote:  
> > > On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <cai@....pw> 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