MongoDB v3.0.6 CentOS -6.5
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• Mongod service goes into unstable state after successive start/stop operation.

• Very easy way to reproduce this issue is start already running service mongod in linux with /etc/init.d/mongod start

• Now, situation will be that if you check with ps -fax then service will be running with PID as below,

26138 ? Sl 0:07 /usr/bin/mongod -f /etc/mongod.conf

And if you check PID in /var/run/mongod
cat /var/run/mongo/mongod.pid
21106

• In this case if you try to restart mongod with /etc/init.d/mongod restart
  output will be as follow
  Stopping mongod: [ OK ]
  Starting mongod: [FAILED]

But in actual mongod service is already running with other PID.

I guess this BUG is in init script of mongo.

As I am new to JIRA, let me know if any other logs or information is required to debug this issue.