LTTng » LTTng-tools

how to reproduce:

killall -9 lttng-sessiond

restart sesssiond

send commands to sessiond that require it to spawn the consumer.

It will hang for 30 seconds waiting on the previous consumer:

compudj@thinkos:~$ ps aux |grep lttng
root 29577 0.0 0.0 230296 1256 pts/0 tl+ 17:15 0:00 lttng-sessiond -vvv
compudj 29589 0.0 0.0 31444 1104 pts/6 S+ 17:15 0:00 lttng enable-channel test -u --num-subbuf 3
root 29591 0.0 0.0 72192 744 pts/0 Sl+ 17:15 0:00 lttng-consumerd --quiet -u --consumerd-cmd-sock /var/run/lttng/ustconsumerd64/command --consumerd-err-sock /var/run/lttng/ustconsumerd64/error
compudj 30511 0.0 0.0 112548 868 pts/9 S+ 17:26 0:00 grep lttng
root 32255 0.0 0.0 68052 712 ? Sl 14:50 0:00 lttng-consumerd --quiet -u --consumerd-cmd-sock /var/run/lttng/ustconsumerd64/command --consumerd-err-sock /var/run/lttng/ustconsumerd64/error

as we see, in that state, we have 2 consumers running.