[diamon-discuss] [BUG] perf data convert to ctf fail.

Hi Jiri Olsa,

We are working on your perf convert to ctf patches and trying to
convert perf.data into CTF trace. By introducing 8 patches from your
repository (the last 8 patches of branch perf/core_ctf_convert) we can
use 'perf data convert --to-ctf' command. However, it doesn't work properly:

 $ perf record ls
 $ perf data convert --to-ctf ./out.ctf
close: Bad file descriptor
Failed to create CTF stream
[ perf data convert: Converted 'perf.data' into CTF data './out.ctf' ]
[ perf data convert: Converted and wrote 0.000 MB (1 samples) ]

After some debug we found that the problem raises from libbaleltrace:
in bt_ctf_writer_create_stream() --> bt_ctf_trace_create_stream(), it tries
to create a stream from stream_class, but doesn't provide a stream_id. When
bt_ctf_trace_create_stream() tries to allocate an id for it, the stream_class
has been freezed.

Could you please have a look at this problem?

Thank you!