Filed by: rgurzau [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=254052884&repo=autoland
Full log: https://queue.taskcluster.net/v1/task/ICAEYnr1RoS_A2SDyXpYoA/runs/0/artifacts/public/logs/live_backing.log

[task 2019-06-29T03:15:42.128Z] 03:15:42 INFO - SUITE-START | Running 470 tests
[task 2019-06-29T03:15:42.744Z] 03:15:42 INFO - TEST-START | js/xpconnect/tests/unit/test_nuke_sandbox.js
[task 2019-06-29T03:15:43.250Z] 03:15:43 WARNING - TEST-UNEXPECTED-FAIL | js/xpconnect/tests/unit/test_nuke_sandbox.js | xpcshell return code: 0
[task 2019-06-29T03:15:43.250Z] 03:15:43 INFO - TEST-INFO took 506ms
[task 2019-06-29T03:15:43.250Z] 03:15:43 INFO - >>>>>>>
[task 2019-06-29T03:15:43.251Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | /data/local/xpcb/xpcw[17]: cd: /sdcard/tests/xpc/js/xpconnect/tests/unit: No such file or directory
[task 2019-06-29T03:15:43.251Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | xpcw: cd /sdcard/tests/xpc/js/xpconnect/tests/unit
[task 2019-06-29T03:15:43.251Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.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_nuke_sandbox.js"]; -e const _TEST_NAME = "js/xpconnect/tests/unit/test_nuke_sandbox.js"; -e _execute_test(); quit(0);
[task 2019-06-29T03:15:43.251Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Unnamed thread 761268021020] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file /builds/worker/workspace/build/src/xpcom/base/nsTraceRefcnt.cpp, line 194
[task 2019-06-29T03:15:43.251Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Unnamed thread 761268021020] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file /builds/worker/workspace/build/src/xpcom/base/nsTraceRefcnt.cpp, line 194
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Unnamed thread 761268021020] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file /builds/worker/workspace/build/src/xpcom/base/nsTraceRefcnt.cpp, line 194
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Unnamed thread 761268021020] WARNING: XPCOM objects created/destroyed from static ctor/dtor: file /builds/worker/workspace/build/src/xpcom/base/nsTraceRefcnt.cpp, line 194
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Main Thread] WARNING: No Android crash handler set: file /builds/worker/workspace/build/src/toolkit/crashreporter/nsExceptionHandler.cpp, line 1472
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - js/xpconnect/tests/unit/test_nuke_sandbox.js | [2716, Main Thread] WARNING: Couldn't get the user appdata directory. Crash events may not be produced.: file /builds/worker/workspace/build/src/toolkit/crashreporter/nsExceptionHandler.cpp, line 2555
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - Error: cannot open file 'test_nuke_sandbox.js' for reading at /sdcard/tests/xpc/head.js:637
[task 2019-06-29T03:15:43.252Z] 03:15:43 INFO - load_file@/sdcard/tests/xpc/head.js:637:7
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - _load_files@/sdcard/tests/xpc/head.js:649:10
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - _execute_test@/sdcard/tests/xpc/head.js:503:3
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - @-e:1:1
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - (xpcshell/head.js) | test MAIN run_test pending (1)
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - (xpcshell/head.js) | test run_next_test 0 pending (2)
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - (xpcshell/head.js) | test MAIN run_test finished (2)
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - running event loop
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - (xpcshell/head.js) | test run_next_test 0 finished (1)
[task 2019-06-29T03:15:43.253Z] 03:15:43 INFO - exiting test

Retrigger range: https://treeherder.mozilla.org/#/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&classifiedState=unclassified&searchStr=android%2C7.0%2Cx86-64%2Cdebug%2Cxpcshell%2Ctests%2C%2Cwithout%2Ce10s%2Ctest-android-em-7.0-x86_64%2Fdebug-xpcshell-1proc-2%2Cx-1proc%28x2%29&tochange=41dbf1cd1fbfb06a8ae09ed7d3377b0bf78b46ae&fromchange=2f081ac561098d6342622c28b86ec92939942c26&selectedJob=254132979

Jason can you please take a look?
Based on retriggers this is from bug 1548369

closing as this seems to no longer occur.