I am entirely new to the lttng-tools and frankly not aware of anything. But, one of our company's customer reported this issue, so I tried reproducing. I was able to reproduce it with the version of lttng-tool (2.12.4 - (Ta) Meilleure) installed on my Ubuntu 16.04 (https://lttng.org/docs/v2.12/#doc-ubuntu-ppa).

Issue is, if I try to snapshot a session with an output filename containing a ".", it fails. Steps I followed are given below :

root@MVIN00032:~# lttng create flightrecorder --snapshot
Snapshot session flightrecorder created.
Default snapshot output set to /home/shubham/lttng-traces/flightrecorder-20221223-153147
Every channel enabled for this session will be set to mmap output and default to overwrite mode.

root@MVIN00032:~# lttng enable-event -k -a
All Kernel events are enabled in channel channel0

root@MVIN00032:~# lttng start
Tracing started for session flightrecorder

root@MVIN00032:~# lttng -vvv snapshot record -s flightrecorder -n record.dump
DEBUG1 - 15:32:15.173476719 [7159/7159]: LSM cmd type : 28 (in send_session_msg() at lttng-ctl.c:128)
Error: Create directory failed
DEBUG1 - 15:32:15.197542565 [7159/7159]: Clean exit (in clean_exit() at lttng.c:152)

root@MVIN00032:~# lttng -vvv snapshot record -s flightrecorder -n record_dump
DEBUG1 - 15:32:24.013450964 [7442/7442]: LSM cmd type : 28 (in send_session_msg() at lttng-ctl.c:128)
Snapshot recorded successfully for session flightrecorder

root@MVIN00032:~# lttng stop
Waiting for data availability
Tracing stopped for session flightrecorder

root@MVIN00032:~# lttng destroy
Session flightrecorder destroyed "

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I tried the same with lttng-tools v2.9.5 (as one of my company's product uses this version) under runqemu session, which worked fine for 'record.dump' & with lttng-tools v2.11.5 (another product uses this version) failed with the same error. So, maybe in between these versions an issue was introduced.

I am not sure whether this is the correct location to send this mail, but I didn't find any solution on the Internet and I am not aware of lttng at all. I was able to reproduce the issue with help from the internet, so thought to report it via this mailing list.

Thanks,

Shubham