Why did our Splunk forwarder die getting "ERROR ProcessRunner - helper process seems to have died (child killed by signal 15: Terminated)"?

[itmonitoring]

FATAL ProcessRunner - Unexpected EOF from process runner child!
ild killed by signal 1510-24-2014 06:42:23.633 -0600 ERROR ProcessRunner - helper process seems to have died (child killed by signal 15: Terminated)

[yaseen417]

There's a possibility that, instead of using splunk restart/stop/start, splunkd is used which is a daemon itself.

[lguinn2]

Signal 15 is sent to a process by the Linux kill command. Is it possible that someone killed the process?

[itmonitoring]

As per logs nobody kills it manually still looking for the reason...

[ben_leung]

This also occurred on the indexer level but instead with a signal 9 in splunkd.log for version 6.0.5, is this known issue?