hi alan, 

with atlasproduction 16.6.5.5, i ran the same job 101 times:
+verbatim+
i=0
while [ $i -le 100 ];
do
  reco_trf.py ami=f379 inputbsfile=/afs/cern.ch/user/g/gencomm/w0/oda/rawcompval/additional12gevmuon/run180664_lb521_event5518475.data outputesdfile=esd.$i.pool.root
  let i=$i+1
done
-verbatim-
(only) 2 out of 101 trial have one additional muidextrapolated muon (pt=12gev, eta=-2.75).
+verbatim+
acmd.py diff-pool /afs/cern.ch/user/g/gencomm/w0/oda/rawcompval/additional12gevmuon/esd.0.pool.root /afs/cern.ch/user/g/gencomm/w0/oda/rawcompval/additional12gevmuon/esd.40.pool.root

================================================================================
::: comparing pool files...
 ref : /afs/cern.ch/user/g/gencomm/w0/oda/rawcompval/additional12gevmuon/esd.0.pool.root
 chk : /afs/cern.ch/user/g/gencomm/w0/oda/rawcompval/additional12gevmuon/esd.40.pool.root
--------------------------------------------------------------------------------
::: comparing common content (mem-size)...
[err]        7.764 kb (ref) ==&gt;        7.861 kb (chk) | calocelllinkcontainer_p2_muonclustercollection_link
[err]       65.589 kb (ref) ==&gt;       65.655 kb (chk) | caloclustercontainer_p7_muonclustercollection
[err]       19.724 kb (ref) ==&gt;       20.478 kb (chk) | caloshowercontainer_p2_muonclustercollection_data
[err]       27.562 kb (ref) ==&gt;       27.690 kb (chk) | muoncaloenergycontainer_tlp1_muoncaloenergycollection
[err]      103.931 kb (ref) ==&gt;      104.204 kb (chk) | muoncontainer_p6_muidesdmuoncollection
[err]      103.919 kb (ref) ==&gt;      104.192 kb (chk) | muoncontainer_p6_muidmuoncollection
[err]      171.807 kb (ref) ==&gt;      171.837 kb (chk) | muonmeasurements_tlp1
[err]      226.236 kb (ref) ==&gt;      226.957 kb (chk) | rec::trackparticlecontainer_tlp2_muidextrtrackparticles
[err]      397.018 kb (ref) ==&gt;      400.111 kb (chk) | trk::trackcollection_tlp3_muidextrapolatedtracks
================================================================================
-verbatim-

cheers, 
susumu 