linux-kernel - [ANNOUNCE] 4.19.72-rt25

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Message-ID: <20190916173921.6368cd62@gandalf.local.home>
Date:   Mon, 16 Sep 2019 17:39:21 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Julia Cartwright <julia@...com>,
        Daniel Wagner <wagi@...om.org>, tom.zanussi@...ux.intel.com
Subject: [ANNOUNCE] 4.19.72-rt25

Dear RT Folks,

I'm pleased to announce the 4.19.72-rt25 stable release.

**** <NOTE> ****

As you probably have noticed, it has been a long time since I released
a stable 4.19-rt. The reason for this delay is that one of my tests
failed after merging with the latest stable upstream. I refuse to push
releases with a known bug in it, so I figured I would find the bug
before releasing. I only spend around 4 to 6 hours a week on upstream
stable RT as I have other responsibilities, and I could not debug this
bug during that time (after several weeks of trying).

The bug is a random NULL pointer dereference that only happens with
lockdep enabled and on 32bit x86. I also found that this bug existed
before the latest stable pull release but now it is much easier to
trigger.

I have not been able to trigger this bug in the 64 bit kernel, and as I
rather do a release than waste more time on this bug and postpone the
release further, I am now doing that. As a consequence, I am no longer
supporting 32bit x86, as it is known to have this bug.

If you are interested in this, I am willing to send out the config I am
using and one of the dmesg crashes. Just ask.

**** </NOTE> ****

This release is just an update to the new stable 4.19.72 version
and no RT specific changes have been made.

You can get this release via the git tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

  branch: v4.19-rt
  Head SHA1: 9cd04ab6a9a162ac4189a80032261d243563ff45

Or to build 4.19.72-rt25 directly, the following patches should be applied:

  http://www.kernel.org/pub/linux/kernel/v4.x/linux-4.19.tar.xz

  http://www.kernel.org/pub/linux/kernel/v4.x/patch-4.19.72.xz

  http://www.kernel.org/pub/linux/kernel/projects/rt/4.19/patch-4.19.72-rt25.patch.xz

Enjoy,

-- Steve