[lttng-dev] UST Create Channel Failed, Why?

Dilong Zheng Dilong.Zheng at mitel.com
Tue Jul 7 11:26:36 EDT 2015

Hi Jeremie,

I am using LTTng v2.5. I am not explicitly creating channels. I am only creating a session: lttng create [session-name] . It used to always just create a session and then enable whichever available user tracepoint that I need (which out explicitly creating any channels).



From: jeremie.galarneau at gmail.com <jeremie.galarneau at gmail.com> on behalf of Jérémie Galarneau <jeremie.galarneau at efficios.com>
Sent: Tuesday, July 7, 2015 11:20 AM
To: Dilong Zheng
Cc: lttng-dev at lists.lttng.org
Subject: Re: [lttng-dev] UST Create Channel Failed, Why?

Hi Dilong,

How do you create this channel and using which version of LTTng?


On Mon, Jul 6, 2015 at 2:11 PM, Dilong Zheng <Dilong.Zheng at mitel.com<mailto:Dilong.Zheng at mitel.com>> wrote:

Hi all,

While trying to enable UST events, I get the following error message:

Error: Event mitel:sem_wait_entry: UST create channel failed (channel channel0, session mcdUST3)

When I type: lttng list -u I am able to see a list of all my UST tracepoints.

Could someone please provide some insight as to why this error is appearing and steps I could take to fix this error. Thanks.

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Jérémie Galarneau
EfficiOS Inc.
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