linux-kernel - Re: [PATCH RFC 0/2] Add basic tracing support for m68k

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Message-ID: <20241119102631.76363f2a@gandalf.local.home>
Date: Tue, 19 Nov 2024 10:26:31 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Geert Uytterhoeven
 <geert@...ux-m68k.org>, Greg Ungerer <gerg@...ux-m68k.org>, Tomas Glozar
 <tglozar@...hat.com>
Subject: Re: [PATCH RFC 0/2] Add basic tracing support for m68k

On Tue, 19 Nov 2024 15:24:00 +0100
Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> wrote:

> Indeed printf gave me clues !
> It appears to be a bug in libtracefs (v1.8.1). rtla segfaults when 
> calling tracefs_local_events() in trace_instance_init().
> 
> Debugging libtracefs pointed me to the load_events() function, and the 
> segfault happens after tep_parse_event() is called for 
> "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_write_folio/format".
> 
> Going through the calls I get to event_read_print_args().
> I changed libtraceevent log level to get the warnings, and it says:
> libtraceevent: Resource temporarily unavailable
>    unknown op '.'
> Segmentation fault

Can you do me a favor and send me privately a tarball of:

 # cp -r /sys/kernel/tracing/events /tmp/events
 # cd /tmp
 # tar -cvjf events.tar.bz2 events

You can't call tar on the /sys/kernel/tracing files as those are pseudo
files with size of zero, and tar will just record empty files :-p

-- Steve