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

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Date:   Mon, 31 Oct 2022 08:11:28 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     regressions@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [REGRESSION 6.0.x / 6.1.x] NULL dereferencing at tracing

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