linux-kernel - Re: [REGRESSION 6.0.x / 6.1.x] NULL dereferencing at tracing

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Message-ID: <CACv5JCJLSJ0G0jfQnucBwE3z62s6eSAYyyWW8U6FLfgn6P0ELA@mail.gmail.com>
Date:   Mon, 31 Oct 2022 01:29:56 -0700
From:   Steven Noonan <steven.noonan@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Steven Rostedt <rostedt@...dmis.org>, regressions@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION 6.0.x / 6.1.x] NULL dereferencing at tracing

I hit this same NULL pointer dereference on one of my systems, trying
to boot with either 6.0.6 or 5.15.76. Unfortunately it happens fairly
early in boot during network initialization, which makes it
frustrating to recover from.


On Mon, Oct 31, 2022 at 12:24 AM Takashi Iwai <tiwai@...e.de> wrote:
>
> Hi Steven,
>
> we've got a bug report indicating the NULL dereference at the recent
> tracing changes, showing at the start of KDE.  The details including
> the dmesg are found at:
>   https://bugzilla.opensuse.org/show_bug.cgi?id=1204705
>
> It was reported at first for 6.0.3, and confirmed that the problem
> persists with 6.1-rc, too.
>
> The culprit seems to be the commit
> f3ddb74ad0790030c9592229fb14d8c451f4e9a8
>     tracing: Wake up ring buffer waiters on closing of the file
> and reverting it seems fixing the problem.
>
> Could you take a look?
>
>
> thanks,
>
> Takashi