From: Qian Cai <cai@lca.pw>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Linux-MM <linux-mm@kvack.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] arm64: increase stack size for KASAN_EXTRA
Date: Tue, 11 Dec 2018 22:54:37 -0500 [thread overview]
Message-ID: <9248f272-4b8f-183d-73eb-28fed1debcd2@lca.pw> (raw)
In-Reply-To: <CAK8P3a2T-DDfmpN_KcLB8cZKTszE4tohR8ChtktP3-du76hJog@mail.gmail.com>
On 12/11/18 6:06 PM, Arnd Bergmann wrote:
>> I am thinking about something it is probably best just waiting for those major
>> distors to complete upgrading to GCC9 or back-porting those stack reduction
>> patches first. Then, it is good time to tie up loose ends for those default
>> stack sizes in all combinations.
>
> I was basically trying to make sure we don't forget it when it gets to that.
I added a reminder in my calendar to check the GCC9 adoption in Q2 FY19.
>
> Another alternative would be to just disable KASAN_EXTRA now
> for gcc versions before 9, which essentially means for everyone,
> but then we get it back once a working version gets released. As
> I understand, this kasan option is actually fairly useless given its
> cost, so very few people would miss it.
>
> On a related note, I think we have to turn off asan-stack entirely
> on all released clang versions. asan-stack in general is much more
> useful than the use-after-scope check, but we clang produces some
> very large stack frames with it and we probably can't even work
> around it with KASAN_THREAD_SHIFT=2 but would need even
> more than that otherwise.
>
> Arnd
>
prev parent reply other threads:[~2018-12-12 3:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-13 4:45 Kernel panic - not syncing: corrupted stack end detected inside scheduler Qian Cai
2018-12-07 22:34 ` [PATCH] arm64: increase stack size for KASAN_EXTRA Qian Cai
2018-12-11 12:42 ` Arnd Bergmann
2018-12-11 17:18 ` Qian Cai
2018-12-11 21:43 ` Arnd Bergmann
2018-12-11 21:52 ` Qian Cai
2018-12-11 21:56 ` Arnd Bergmann
2018-12-11 21:59 ` Qian Cai
2018-12-11 22:12 ` Arnd Bergmann
2018-12-11 22:22 ` Qian Cai
2018-12-11 23:06 ` Arnd Bergmann
2018-12-12 3:54 ` Qian Cai [this message]
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