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Date:   Mon, 18 Feb 2019 10:53:53 -0500
From:   Qian Cai <>
To:     Andrey Konovalov <>
Cc:     Steven Rostedt <>,
        Ingo Molnar <>,
        Will Deacon <>,
        Catalin Marinas <>,
        Andrey Ryabinin <>,
        Linux ARM <>,
        kasan-dev <>,
        LKML <>
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 <> 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!

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