Check for rr traceback in stderr logs

[tysmith]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.60%. Comparing base (6a93ede) to head (3d2182c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #430   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files          52       52           
  Lines        5585     5591    +6     
=======================================
+ Hits         5563     5569    +6     
  Misses         22       22           

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