[lttng-dev] UST context causes empty trace

[Mathieu Desnoyers]

Yes, it's broken here too. Can you open a bug report against UST please?

it looks like those are missing when we enable UST contexts:

libust[26034/26049]: Sent register channel notification: chan_id 0, header_type 1
 (in ustcomm_register_channel() at lttng-ust-comm.c:1053)
[...]
libust[26034/26034]: Sent register event notification for name "ust_tests_hello:tptest": ret_code 0, event_id 0
 (in ustcomm_register_event() at lttng-ust-comm.c:948)
libust[26034/26034]: Sent register event notification for name "ust_tests_hello:tptest_sighandler": ret_code 0, event_id 1
 (in ustcomm_register_event() at lttng-ust-comm.c:948)

(I get those in a run where I don't enable any UST context, but not in
the problematic case)

the rest seems to be there when launching the app with LTTNG_UST_DEBUG=1
env var set. So it looks like an issue within UST.

Thanks,

Mathieu

* Francis Giraldeau (francis.giraldeau at gmail.com) wrote:
> With 2.2.0-rc2, when enabling some context for UST, the generated trace
> is empty. Here is a small script to reproduce the problem:
> 
> $ cat do.sh
> lttng create
> lttng enable-channel u -u
> lttng enable-event -c u -a -u
> lttng add-context -c u -u -t vpid -t vtid
> lttng start
> $@
> lttng stop
> lttng view
> lttng destroy
> 
> When commenting out the "add-context" command, then the trace is
> generated correctly. Does someone else is able to confirm the problem?
> 
> Thanks,
> 
> Francis Giraldeau
> 



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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com