linux-kernel - Re: KASAN + CPU soft-hotplug = stack-out-of-bounds at cpuinfo_store

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Message-ID: <CACT4Y+bj7JU=5Db=bAafjNKJcezeczzDCTwpKvhhC8kESc5+kQ@mail.gmail.com>
Date:   Sat, 13 Nov 2021 07:49:39 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Qian Cai <quic_qiancai@...cinc.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: KASAN + CPU soft-hotplug = stack-out-of-bounds at cpuinfo_store_cpu

On Sat, 13 Nov 2021 at 07:07, Qian Cai <quic_qiancai@...cinc.com> wrote:
>
> 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

This may be just a bad format string.
But I don't see kernel/printk/printk.c:2264 doing any printk on
next-20211110. What's up with line numbers?