[ltt-dev] UST - Problems in recording trace on a current process

[Pierre-Marc Fournier]

Naren wrote:
> Hi Pierre
> 
>>>I just commited a quick and dirty fix for this issue. A refactoring of
> the ust
>>>communication lib is in progress to address this more elegantly.
> 
> Everything is working fine.Finally. With the default markers,I am
> getting a trace but in LTTV, i could only see the 6 events that was
> captured, hence not getting anything in control flow viewer. I presume,
> lot many instrumentations have to be added by me before i get to see any
> substantial trace results. 
> 
> Thanks a lot for you help.
> 
> However, i made few observations
> 
> 1. In the terminal window, where i gave LD_PRELOAD, i am getting this
> error after destroying the trace and closing the traced program
> 
> *root at naren-laptop:/usr/src# LD_PRELOAD=/usr/local/lib/libust.so.0.0.0
> /usr/bin/gimp*
> *libust[9868/9869]: Error: cannot find trace! (in do_cmd_put_subbuffer()
> at tracectl.c:632)*
> *libust[9868/9869]: Error: cannot find trace! (in do_cmd_put_subbuffer()
> at tracectl.c:632)*
> *
> *
> 2. In the terminal window where ustd demon is running, i am getting the
> following errors
> 
> *ustd[9447/9820]: Error: Buffer overflow (channel=metadata_0), reader
> pushed. This channel will not be usable passed this point. (in
> consumer_loop() at ustd.c:399)*
> *ustd[9447/9881]: Error: unable to parse response to put_subbuffer (in
> put_subbuffer() at ustd.c:141)*
> *ustd[9447/9881]: Error: unknown error putting subbuffer (channel=ust_0)
> (in consumer_loop() at ustd.c:395)*
> *ustd[9447/9880]: Error: Buffer overflow (channel=metadata_0), reader
> pushed. This channel will not be usable passed this point. (in
> consumer_loop() at ustd.c:399)*
> *
> *
> Buffer over error, is it due to the fact that trace is being recorded in
> flight recorder mode?
> 

Hi Naren,

Please check if this is fixed in UST 0.2 that was just released.

Thanks!

pmf