Hi Jérémie, Maybe I misunderstood how to create a session, but are the commands that I listed not sufficient for this?
• lttng create • lttng enable-event --kernel --syscall open,close • lttng start Kind regards, Robin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jérémie Galarneau Sent: Tuesday, 14 November, 2017 17:09 To: Robin Michielsen Cc: [email protected] Subject: Re: [lttng-dev] Error: opening metadata failed (LTTng on OpenWRT) Hi Robin, Can you add the commands you use to create the session? Thanks, Jérémie On 14 November 2017 at 04:41, Robin Michielsen <[email protected]> wrote: > Hi all, > > > > I am trying to trace the Linux kernel (system calls) using LTTng on a > platform that is running OpenWRT. I have cross compiled the latest > versions > (2.10.x) of the lttng-modules, lttng-tools and lttng-ust packages and > installed these on my OpenWRT system. Now when I start a kernel trace > then the lttng tool returns the error "LTTng transport relay-metadata > not found / > Error: Opening metadata failed". Does anybody know what might cause > this error, or have a hint on what to check? > > > > I have attached the captured output of ‘lttng-sessiond -vvv > --verbose-consumer’. Here is some more context: > > · MIPS platform running Linux 3.18.29 > > · Package versions: > > o lttng-modules-2.10.4 > > o lttng-tools-2.10.1 > > o lttng-ust-2.10.0 > > · lsmod shows that the following modules have been loaded: > > o lttng_clock > > o lttng_lib_ring_buffer > > o lttng_ring_buffer_client_discard > > o lttng_statedump > > o lttng_tracer > > · Commands to create and start a session: > > o lttng create > > o lttng enable-event --kernel --syscall open,close > > o lttng start > > > > When ‘lttng start’ is called then lttng-sessiond’s debug output shows > “Closing metadata fd -1 (in trace_kernel_destroy_metadata() at > trace-kernel.c:569)” followed by “Sending response (size: 20, retcode: > Opening metadata failed (45)) (in thread_manage_clients() at main.c:4641)”. > I assume that the error that I’m seeing is because for some reason > metadata fd is being closed. > > > > Does anybody know what may cause this issue, or have a hint on to check? > > > > Kind regards, > > Robin > > > > > _______________________________________________ > lttng-dev mailing list > [email protected] > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev > -- Jérémie Galarneau EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
