linux-kernel - Re: BUG: KASAN: stack-out-of-bounds in unwind_next

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Message-ID: <YBrTaVVfWu2R0Hgw@hirez.programming.kicks-ass.net>
Date:   Wed, 3 Feb 2021 17:46:33 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     kernel-team <kernel-team@...udflare.com>,
        Ignat Korchagin <ignat@...udflare.com>,
        Hailong liu <liu.hailong6@....com.cn>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Julien Thierry <jthierry@...hat.com>,
        Jiri Slaby <jirislaby@...nel.org>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kernel <linux-kernel@...r.kernel.org>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Robert Richter <rric@...nel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf@...r.kernel.org
Subject: Re: BUG: KASAN: stack-out-of-bounds in
 unwind_next_frame+0x1df5/0x2650

On Tue, Feb 02, 2021 at 07:09:44PM -0800, Ivan Babrou wrote:
> On Thu, Jan 28, 2021 at 7:35 PM Ivan Babrou <ivan@...udflare.com> wrote:

> > ==================================================================
> > [  128.368523][    C0] BUG: KASAN: stack-out-of-bounds in
> > unwind_next_frame (arch/x86/kernel/unwind_orc.c:371
> > arch/x86/kernel/unwind_orc.c:544)
> > [  128.369744][    C0] Read of size 8 at addr ffff88802fceede0 by task
> > kworker/u2:2/591

Can you pretty please not line-wrap console output? It's unreadable.

> edfd9b7838ba5e47f19ad8466d0565aba5c59bf0 is the first bad commit
> commit edfd9b7838ba5e47f19ad8466d0565aba5c59bf0

Not sure what tree you're on, but that's not the upstream commit.

> Author: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Date:   Tue Aug 18 15:57:52 2020 +0200
> 
>     tracepoint: Optimize using static_call()
> 

There's a known issue with that patch, can you try:

  http://lkml.kernel.org/r/20210202220121.435051654@goodmis.org