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

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Message-ID: <20210204023719.sbwh7o7un7j2zgkd@treble>
Date:   Wed, 3 Feb 2021 20:37:19 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        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>,
        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, Alexey Kardashevskiy <aik@...abs.ru>
Subject: Re: BUG: KASAN: stack-out-of-bounds in
 unwind_next_frame+0x1df5/0x2650

On Wed, Feb 03, 2021 at 04:52:42PM -0800, Ivan Babrou wrote:
> We also have the following stack that doesn't touch any crypto:
> 
> * https://gist.github.com/bobrik/40e2559add2f0b26ae39da30dc451f1e

Can you also run this through decode_stacktrace.sh?

Both are useful (until I submit a fix for decode_stacktrace.sh).

> I cannot reproduce this one, and it took 2 days of uptime for it to
> happen. Is there anything I can do to help diagnose it?

Can you run with the same unwind_debug patch+cmdline when you try to
recreate this one?  In the meantime I'll look at the available data.

-- 
Josh