linux-kernel - Re: [PATCH v4 09/10] eventfs: Move tracing/events to eventfs

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Message-ID: <20230908083156.7d261adb@gandalf.local.home>
Date:   Fri, 8 Sep 2023 08:31:56 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sven Schnelle <svens@...ux.ibm.com>
Cc:     Ajay Kaher <akaher@...are.com>, shuah@...nel.org,
        mhiramat@...nel.org, chinglinyu@...gle.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, lkp@...el.com,
        namit@...are.com, oe-lkp@...ts.linux.dev, amakhalov@...are.com,
        er.ajay.kaher@...il.com, srivatsa@...il.mit.edu, tkundu@...are.com,
        vsirnapalli@...are.com
Subject: Re: [PATCH v4 09/10] eventfs: Move tracing/events to eventfs

On Fri, 08 Sep 2023 14:14:20 +0200
Sven Schnelle <svens@...ux.ibm.com> wrote:

> Ajay Kaher <akaher@...are.com> writes:
> 
> > Till now /sys/kernel/debug/tracing/events is a part of tracefs,
> > with-in this patch creating 'events' and it's sub-dir as eventfs.
> > Basically replacing tracefs calls with eventfs calls for 'events'.
> >
> > Signed-off-by: Ajay Kaher <akaher@...are.com>
> > Co-developed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > Tested-by: Ching-lin Yu <chinglinyu@...gle.com>
> > ---
> >  fs/tracefs/inode.c           | 18 ++++++++++
> >  include/linux/trace_events.h |  1 +
> >  kernel/trace/trace.h         |  2 +-
> >  kernel/trace/trace_events.c  | 67 +++++++++++++++++++-----------------
> >  4 files changed, 55 insertions(+), 33 deletions(-)  
> 
> With this patchset in next-20230908 the following crash is observed on
> s390 while running ftracetest test.d/instances/instance-event.tc:
> 
> (It also crashes without KASAN, just not on every try)

Yep, and I've spent the last few days fixing this :-)

  https://lore.kernel.org/linux-trace-kernel/20230907024710.866917011@goodmis.org/

-- Steve