LTTng » LTTng-tools

From Issue #1110:

Then, when running as root, the test will abort if the problem is triggered:

lttng create
lttng enable-channel -u chan_ust
lttng enable-channel -k chan_kernel
lttng add-context -u -t vpid -t ip -t procname -t vtid -c chan_ust
lttng enable-event -u -a -c chan_ust
lttng enable-event -k -c chan_kernel --syscall --all
lttng start
LD_PRELOAD=liblttng-ust-dl.so:liblttng-ust-fork.so:liblttng-ust-fd.so ./fork12
After forcibly stopping the test (^C), errors are reported and events could be miscounted when issuing lttng stop:

[warning] 9223372037047268318 events discarded, please refer to the documentation on channel configuration.

Possible source of problem is that a negative is returned somewhere. Either by kernel or ust trace.