Re: [lttng-dev] Suspected Bug in lttng-tools

[Shubham Kulkarni via lttng-dev <lttng-dev@lists.lttng.org>]

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Hi,

Please ignore the previous mail from me saying there might be a bug in
lttng-tools. After some analysis, I found this is expected functionality as
per the commit https://github.com/lttng/lttng-tools/commit/cb034ca.
It's NOT A BUG.

Thanks,
Shubham


On Mon, Dec 26, 2022 at 3:52 PM Shubham Kulkarni <shubhambkul16@gmail.com>
wrote:

> Hi,
>
> 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 *"*
>
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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
>

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