Same issue here with Splunk 7.1.1 and the latest plugin. Randomly quits within 2 weeks.. no errors, process is just still running.
I ran an strace on the stalled process, and it is generating these events over and over
[pid 18829] <... select resumed> ) = 0 (Timeout)
[pid 18829] select(0, NULL, NULL, NULL, {0, 50000}
[pid 18726] <... select resumed> ) = 0 (Timeout)
[pid 18726] select(0, NULL, NULL, NULL, {0, 50000}
[pid 18835] <... select resumed> ) = 0 (Timeout)
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/tenable_sc_inputs.conf", {st_mode=S_IFREG|0600, st_size=201, ...}) = 0
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/tenable_sc_inputs.conf", {st_mode=S_IFREG|0600, st_size=201, ...}) = 0
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/nessus.conf", {st_mode=S_IFREG|0600, st_size=533, ...}) = 0
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/nessus.conf", {st_mode=S_IFREG|0600, st_size=533, ...}) = 0
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/tenable_sc_servers.conf", {st_mode=S_IFREG|0600, st_size=172, ...}) = 0
[pid 18835] stat("/opt/splunk/etc/apps/Splunk_TA_nessus/local/tenable_sc_servers.conf", {st_mode=S_IFREG|0600, st_size=172, ...}) = 0
[pid 18835] getppid() = 18566
[pid 18835] select(0, NULL, NULL, NULL, {0, 1000}) = 0 (Timeout)
[pid 18835] select(0, NULL, NULL, NULL, {0, 2000}) = 0 (Timeout)
[pid 18835] select(0, NULL, NULL, NULL, {0, 4000}
[pid 18836] <... select resumed> ) = 0 (Timeout)
[pid 18836] select(0, NULL, NULL, NULL, {0, 50000}
[pid 18835] <... select resumed> ) = 0 (Timeout)
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