in the muonrecrtt/zmumu rtt test, the i686 dbg build is consistently failing with a warning: 

+verbatim+
fpeauditor warning fpe divbyzero in [execute of [indetlowbetatrkalgorithm]
-verbatim-

and then an unclean exit on a failed assert (which *would* only show up in dbg):

+verbatim+
python: /build/atnight/localbuilds/nightlies/17.x.0-val/atlasconditions/rel_0/installarea/include/
trkparametersbase/trkparametersbase/parameterst.icc:103: void trk::parameterst&lt;t&gt;::checkrangephitheta() const [with t = trk::charged]: assertion `false' failed.&quot;
-verbatim-

this comes after a huge number of &quot;forwardindexingpolicy error reverselookup: element not found&quot; warnings, but i think those are not connected (although also undesirable!)

here's an example logfile, for rel_3 but it had been happening before that:

https://atlasrtt.cern.ch/rtt/rel_3/devval/build/i686-slc5-gcc43-dbg/offline/muonrecrtt/zmumu/zmumu_log

andy
as sw val shifter
