linux-kernel - Re: [BUG] NULL pointer dereference probably caused by kernel/trace/ring

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Message-ID: <A4AF246E-EC34-4672-9E7A-ECD8B15D0A49@goodmis.org>
Date:   Mon, 31 Oct 2022 09:24:13 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Roland Ruckerbauer <roland.rucky@...il.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
CC:     linux-kernel@...r.kernel.org
Subject: Re: [BUG] NULL pointer dereference probably caused by kernel/trace/ring_buffer.c

Yes it's been reported. At my next layover, I'll take a look at it.

-- Steve 

On October 31, 2022 9:02:12 AM EDT, Roland Ruckerbauer <roland.rucky@...il.com> wrote:
>Somewhere between kernel 6.0.2 and 6.0.5 I started getting crashes
>when https://github.com/mchehab/rasdaemon is starting.
>
>After investigating a bit, I found the following commits:
>a6b4d8d6656f ring-buffer: Fix race between reset page and reading page
>fa76ee6fea9c ring-buffer: Add ring_buffer_wake_waiters()
>7bf3c4d84204 ring-buffer: Check pending waiters when doing wake ups as well
>692cc072c800 ring-buffer: Have the shortest_full queue be the shortest
>not longest
>57af2334ca70 ring-buffer: Allow splice to read previous partially read pages
>
>I guess one of them must have broken something rasdaemon is using,
>since the crash is in ring_buffer_wake_waiters(), and it was first
>introduced by this commit series.
>
>The crash report is attached in dmesg.log.
>
>For me the crash is easily reproducible. For testing I run 6.0.5
>upstream kernel, but I guess everything since 6.0.3 is affected as
>well.
>
>My hardware (hopefully irrelevant): x570 amd platform (ryzen 5000)
>
>If I can help in any way, please say so (testing patches etc ...).
>
>Thanks,
>Roland Ruckerbauer

-- 
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