From: Qian Cai <cai@lca.pw>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
kasan-dev <kasan-dev@googlegroups.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] trace: skip hwasan
Date: Mon, 18 Feb 2019 10:53:53 -0500 [thread overview]
Message-ID: <dddc0e6e-af71-c98c-c8db-20c6d9fa87c3@lca.pw> (raw)
In-Reply-To: <CAAeHK+y8Xd1J2DppUMQLVhoc69wrqgNA=9hV45Jsd7V97CN6yw@mail.gmail.com>
On 2/18/19 10:25 AM, Andrey Konovalov wrote:
> On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <cai@lca.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!
WARNING: multiple messages have this Message-ID (diff)
From: Qian Cai <cai@lca.pw>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] trace: skip hwasan
Date: Mon, 18 Feb 2019 10:53:53 -0500 [thread overview]
Message-ID: <dddc0e6e-af71-c98c-c8db-20c6d9fa87c3@lca.pw> (raw)
In-Reply-To: <CAAeHK+y8Xd1J2DppUMQLVhoc69wrqgNA=9hV45Jsd7V97CN6yw@mail.gmail.com>
On 2/18/19 10:25 AM, Andrey Konovalov wrote:
> On Sun, Feb 17, 2019 at 5:34 AM Qian Cai <cai@lca.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!
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next prev parent reply other threads:[~2019-02-18 15:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-17 4:34 [PATCH] trace: skip hwasan Qian Cai
2019-02-17 4:34 ` Qian Cai
2019-02-17 7:30 ` Dmitry Vyukov
2019-02-17 7:30 ` Dmitry Vyukov
2019-02-18 13:27 ` Qian Cai
2019-02-18 13:27 ` Qian Cai
2019-02-18 13:56 ` Dmitry Vyukov
2019-02-18 13:56 ` Dmitry Vyukov
2019-02-18 13:59 ` Will Deacon
2019-02-18 13:59 ` Will Deacon
2019-02-21 14:19 ` James Morse
2019-02-21 14:19 ` James Morse
2019-02-18 10:43 ` Will Deacon
2019-02-18 10:43 ` Will Deacon
2019-02-18 15:25 ` Andrey Konovalov
2019-02-18 15:25 ` Andrey Konovalov
2019-02-18 15:53 ` Qian Cai [this message]
2019-02-18 15:53 ` Qian Cai
2019-02-18 15:56 ` Andrey Konovalov
2019-02-18 15:56 ` Andrey Konovalov
2019-02-18 17:23 ` Steven Rostedt
2019-02-18 17:23 ` Steven Rostedt
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