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

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Date:   Mon, 18 Feb 2019 10:53:53 -0500
From:   Qian Cai <cai@....pw>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        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 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!