A review of the disarm filtering mscsvc_log shows an error creating a temorary directory.
(ERROR:8488.4152440528):  CReconstructor::LogStats: cannot create directory for '/var/tmp/ms/CC/AD/85/CCAD8549A6ED44853132F9CFEFE299EE.xml' with error:File exists
Multiple threads attempt to create the same temporary directory.
Under load the SMG disarm service may see multiple threads each attempting to create a temporary directory with the same path. There is no indication that this causes an error in message processing. This error can be safely ignored.