LTTng » LTTng-UST

I tried 2 scenarios:

1) no app running, running the test program, and enable.

No error.

2) hello running in background (in a 3000 sec. wait), running the test program fails with:

Enable channel: UST create channel failed

(and there seems to be a missing \n after the error message)

So I cannot reproduce your problem. Maybe you ran the test prog, launched an UST app, and then got the error at enable event ?

Please detail your test case, including whether an UST app is running or not, so I can reproduce.

Thanks,

Mathieu

For applications not started when issuing create channel, fixed by lttng-tools commit:

commit 95e047ff8e01767e2e18b892f7a1ba9bf28abcbe
Author: David Goulet <dgoulet@efficios.com>
Date: Thu Dec 13 17:51:45 2012 -0500

Fix: RCU unlock out of error path

On channel error, RCU was not unlocking the read side. Furthermore,
    remove a check for a NULL session that was also not going through an RCU
    unlock. Change it to an assert.

This also adds a channel subbuf size check when enabling a channel.

Signed-off-by: David Goulet <dgoulet@efficios.com>

For apps already started, it was already working fine.