[lttng-dev] More LTTng problems

[David Goulet]

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Hi,

This is pretty odd... it seems the execl() of the consumer failed...

We'll have to confirm this with the perror code I guess. Can you apply
this patch and re-run again.

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index c952fc0..d3c378b 100644
- --- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -1782,6 +1782,7 @@ static pid_t spawn_consumerd(struct
consumer_data *consumer_data)
                    free(tmpnew);
               }
               if (ret) {
+                   PERROR("execl 32-bit consumer");
                    goto error;
               }
               break;

If you want, to speed things up, you can come on OFTC irc server on
#lttng and we'll be able to assist you in real time to find this problem.

Cheers
David

Henrik Hautakoski:
> Ok so I attached the output from lttng-sessiond (it's large).
> 
> the commands was:
> 
> # lttng-sessiond --vvv --no-kernel --verbose-consumer
> 
> # lttng list -u
> 
> # lttng create mysession
> 
> # lttng enable-event -a -u
> 
> Nothing shows up in dmesg.
> 
> On Fri, Aug 17, 2012 at 5:15 PM, David Goulet
> <dgoulet at efficios.com> wrote: Hi,
> 
> Actually, this error means that a problem occurred *during* the 32
> bit consumer spawning process... It seems the binary was found but
> failed to exec it.
> 
> Running the session daemon (lttng-sessiond) with options "-vvv 
> --verbose-consumer" will help us pin down the problem.
> 
> Send me back the output, I'll be able to tell you what's going on
> (and also the series of command you guys did before the
> enable-event).
> 
> Last thing, make sure the lttng-consumerd did not segfault (dmesg)
> or any other lttng-tools component.
> 
> Thanks! David
> 
> Mathieu Desnoyers:
>>>> It looks like you did not build a 32-bit consumer. I'm ccing
>>>> David Goulet, maintainer of lttng-tools.
>>>> 
>>>> Thanks,
>>>> 
>>>> Mathieu
>>>> 
>>>> * Henrik Hautakoski (henrik at fiktivkod.org) wrote:
>>>>> Hi. got lttng working now. but when given the following
>>>>> command, we get an error.
>>>>> 
>>>>> $ lttng enable-event -a -u Error: Events: 32-bit UST
>>>>> consumer start failed (channel channel0, session
>>>>> mysession)
>>>>> 
>>>>> Could not find any information about this error massage. do
>>>>> you have any ideas?
>>>>> 
>>>>> -- Henrik Hautakoski henrik at fiktivkod.org
>>>> 
> 
> 
> 
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