When running raptor locally and it crashes, minidump stackwalk is not enabled so we cannot get a stacktrace: 11:19:26 INFO - PROCESS-CRASH | runner.py | application crashed [None] 11:19:27 INFO - Crash dump filename: /var/folders/ty/60lmmg9565b_51cfpchkzbkw0000gn/T/tmpq_LQnI.mozrunner/minidumps/8C4FF83C-84B0-40CA-8669-DE6EEEA88C9A.dmp 11:19:27 INFO - MINIDUMP_STACKWALK not set, can't process dump.

Oh :gbrown mentioned to me that this is expected i.e. MINIDUMP_STACKWALK needs to be setup locally on your own dev environment, it's not something set by the test harnesses directly.