linux-kernel - Re: "[PATCH] selftests/ftrace: Correctly enable event in instance-event.tc"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230906173706.7aeb8716@gandalf.local.home>
Date:   Wed, 6 Sep 2023 17:37:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     zhengyejian1@...wei.com, akaher@...are.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, mhiramat@...nel.org,
        shuah@...nel.org, skhan@...uxfoundation.org, yeweihua4@...wei.com
Subject: Re: "[PATCH] selftests/ftrace: Correctly enable event in
 instance-event.tc"

On Wed, 6 Sep 2023 10:37:18 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> > Log details,
> > -------------
> > # ok 45 ftrace - test tracing error log support
> > <47>[ 1373.662292] systemd-journald[90]: Sent WATCHDOG=1 notification.
> > # ok 46 Test creation and deletion of trace instances while setting an event  
> 
> It's definitely a race with the creation and deletion of instances.
> 
> I'm going to run it on my laptop VM and see if that reproduces it. My other
> VM is on a pretty powerful machine, and perhaps that's keeping it from
> hitting the race.

Putting in a while loop of:

  # while :; do ./ftracetest test.d/instances/instance-event.tc ; done

eventually triggered the bug. Looks like this is really an existing bug not
related to the eventfs, but the eventfs code actually opened up the window
of this race.

Hopefully I'll have a fix shortly.

-- Steve