The McLachlan test ML_BSSN_sgw3d has been failing since 03-Aug-2011. The only tested variable which is showing differences is kxx, but the differences appear to be significantly larger than roundoff:
kxx.x.asc: substantial differences significant differences on 16 (out of 36) lines maximum absolute difference in column 13 is 0.000822901437894541 maximum relative difference in column 13 is 0.0560528644051835 (insignificant differences on 16 lines)
This coincides with the following commit:
Correct schedule, in particular for checkpoint/recovery Do not mark ADMBase variables for non-checkpointing if they have multiple timelevels. (Variables with multiple timelevels must always be checkpointed, because the past timelevels cannot be regenerated after recovery.) Finally remove all perl post-processing of the auto-generated code; instead, use proper Kranc mechanisms. Schedule the ADM constraints and ADM quantities after MoL_PostStep, since this is where the ADMBase variables are set. Schedule enforcing the BSSN constraints in the new schedule group MoL_PostStepModify, since they should not be enforced after recovery. (This would lead to inconsistencies at floating-point round-off level.) Regenerate all thorns.
and the other commits made to Cactus at the same time as explained in this email:
Attached is a diff which shows what changed between the test passing and failing.
Since this test does not deal with checkpointing or recovery, I don't understand why kxx should change so drastically.