Separate log messages get squashed into a single one

[worker] _3DCartDownloadOrders-27 2015-08-20T07:28:47.134Z - : LimitOffset:readPageRequest 
{ params: { limit: 100, offset: 401, datestart: '05/20/2015' } }
[worker] _3DCartDownloadOrders-27 2015-08-20T07:28:47.135Z - : LimitOffset:readPageRequest 
{ params: { limit: 100, offset: 501, datestart: '05/20/2015' } }
[worker] _3DCartDownloadOrders-27 2015-08-20T07:28:47.136Z - : LimitOffset:readPageRequest 
{ params: { limit: 100, offset: 601, datestart: '05/20/2015' } }
2015-08-20T07:28:47.137Z - : LimitOffset:readPageRequest 
{ params: { limit: 100, offset: 701, datestart: '05/20/2015' } }
[worker] _3DCartDownloadOrders-27 2015-08-20T07:28:47.139Z - : LimitOffset:readPageRequest 
{ params: { limit: 100, offset: 801, datestart: '05/20/2015' } }

This happens only sometimes, so maybe it's caused by a race condition of some kind.

Software versions:

starfall@nx:~/workspace/bellefit-engine$ pm2 --version
0.14.7
starfall@nx:~/workspace/bellefit-engine$ node --version
v0.12.7
starfall@nx:~/workspace/bellefit-engine$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"

The report names no source files, tests, or entry points. Start by reproducing the intermittent log squashing with the reported PM2 0.14.7 and Node.js 0.12.7 versions, then trace the logging path for concurrent writes. Done means separate log messages remain distinct and a regression test covers the behavior.