Filed by: ncsoregi [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=254729247&repo=mozilla-central
Full log: https://queue.taskcluster.net/v1/task/Y8Rj9Fc9SEiLeZ_DNA6WRA/runs/0/artifacts/public/logs/live_backing.log

[task 2019-07-04T10:51:52.885Z] 10:51:52 INFO - TEST-START | caps/tests/unit/test_origin.js
[task 2019-07-04T10:51:53.391Z] 10:51:53 WARNING - TEST-UNEXPECTED-FAIL | caps/tests/unit/test_origin.js | xpcshell return code: 139
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - TEST-INFO took 506ms
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - >>>>>>>
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - caps/tests/unit/test_origin.js | xpcw: cd /sdcard/tests/xpc/caps/tests/unit
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - caps/tests/unit/test_origin.js | xpcw: xpcshell -r /sdcard/tests/xpc/c/httpd.manifest --greomni /data/local/xpcb/target.apk -m -s -e const _HEAD_JS_PATH = "/sdcard/tests/xpc/head.js"; -e const _MOZINFO_JS_PATH = "/sdcard/tests/xpc/p/mozinfo.json"; -e const _PREFS_FILE = "/sdcard/tests/xpc/user.js"; -e const _TESTING_MODULES_DIR = "/sdcard/tests/xpc/m"; -f /sdcard/tests/xpc/head.js -e const _HEAD_FILES = []; -e const _JSDEBUGGER_PORT = 0; -e const _TEST_FILE = ["test_origin.js"]; -e const _TEST_NAME = "caps/tests/unit/test_origin.js"; -e _execute_test(); quit(0);
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - caps/tests/unit/test_origin.js | Segmentation fault
[task 2019-07-04T10:51:53.391Z] 10:51:53 INFO - <<<<<<<

Corrected by downgrading the emulator used for android xpcshell tests, https://hg.mozilla.org/mozilla-central/rev/49f22f8f91f9, bug 1556058.