Date:   Sat, 13 Nov 2021 01:07:37 -0500
From:   Qian Cai <quic_qiancai@quicinc.com>
To:     Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Mark Rutland <mark.rutland@arm.com>
CC:     <linux-arm-kernel@lists.infradead.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>,
        Valentin Schneider <valentin.schneider@arm.com>
Subject: Re: KASAN + CPU soft-hotplug = stack-out-of-bounds at
 cpuinfo_store_cpu
Message-ID: <YY9WKU/cnQI4xqNE@qian-HP-Z2-SFF-G5-Workstation>
References: <YY9ECKyPtDbD9q8q@qian-HP-Z2-SFF-G5-Workstation>
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On Fri, Nov 12, 2021 at 11:50:19PM -0500, Qian Cai wrote:
> FYI, running CPU soft-hotplug with KASAN on arm64 defconfig will
> always trigger a stack-out-of-bounds below.

Actually, KASAN is not enough to trigger. It needs some addition
debugging options to reproduce. I'll narrow it down later. Anyway,
this one will reproduce.

http://lsbug.org/tmp/config-bad-14rc1.txt