https://tbpl.mozilla.org/php/getParsedLog.php?id=28568250&full=1&branch=mozilla-aurora TEST-START | tests/test-places-bookmarks.testSearchCount Program firefox/firefox-bin (pid = 2114) received signal 11. Stack: UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x021A261A] UNKNOWN 0xb770840c UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x012A8F8E] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x012A915F] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x018D833B] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x018D84FC] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x018D380E] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x01888884] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x013DA623] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x0190C2DE] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x0190C304] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x01323D57] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x01137AC3] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x002FF4BE] UNKNOWN [/builds/slave/test/build/firefox/libxul.so +0x003020FB] XRE_main+0x000000A7 [/builds/slave/test/build/firefox/libxul.so +0x0030232D] UNKNOWN [firefox/firefox-bin +0x0000320F] UNKNOWN [firefox/firefox-bin +0x0000338D] Sleeping for 300 seconds. Type 'gdb firefox/firefox-bin 2114' to attach your debugger to this thread. Done sleeping... TEST-UNEXPECTED-FAIL | tests/test-places-bookmarks.testSearchCount | Test output exceeded timeout (300s). Traceback (most recent call last): File "jetpack/bin/cfx", line 33, in <module> cuddlefish.run() File "/builds/slave/test/build/jetpack/python-lib/cuddlefish/__init__.py", line 612, in run test_all_packages(env_root, defaults=options.__dict__) File "/builds/slave/test/build/jetpack/python-lib/cuddlefish/__init__.py", line 494, in test_all_packages env_root=env_root) File "/builds/slave/test/build/jetpack/python-lib/cuddlefish/__init__.py", line 945, in run pkgdir=options.pkgdir) File "/builds/slave/test/build/jetpack/python-lib/cuddlefish/runner.py", line 742, in run_app OUTPUT_TIMEOUT, test_name, parseable) Exception: Test output exceeded timeout (300s). program finished with exit code 1

Unsure if it's relevant, but a bit further up in the log I see an assertion being fired a few times at the start of previous tests: TEST-START | tests/test-places-bookmarks.testSearchByGroupComplex TEST-PASS | tests/test-places-bookmarks.testSearchByGroupComplex | only one javascript result under mozgroup TEST-PASS | tests/test-places-bookmarks.testSearchByGroupComplex | correct result TEST-PASS | tests/test-places-bookmarks.testSearchByGroupComplex | expected results TEST-PASS | tests/test-places-bookmarks.testSearchByGroupComplex | does not find results from other folders ###!!! ASSERTION: Removing item we don't have: 'Not Reached', file ../../../../toolkit/components/places/nsNavHistoryResult.cpp, line 3683 TEST-START | tests/test-places-bookmarks.testSearchByGroupSimple TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | returns folders TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | should return all bookmarks and folders under UNSORTED TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | returns instance TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | returns one subfolder TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | returns all children bookmarks/folders TEST-PASS | tests/test-places-bookmarks.testSearchByGroupSimple | returns nested children ###!!! ASSERTION: Removing item we don't have: 'Not Reached', file ../../../../toolkit/components/places/nsNavHistoryResult.cpp, line 3683 TEST-START | tests/test-places-bookmarks.testSearchComplexQueryWithOptions WARNING: 1 sort operation has occurred for the SQL statement '0x1550fab8'. See https://developer.mozilla.org/En/Storage/Warnings details.: file ../../../storage/src/mozStoragePrivateHelpers.cpp, line 110 TEST-PASS | tests/test-places-bookmarks.testSearchComplexQueryWithOptions | correct ordering and item TEST-PASS | tests/test-places-bookmarks.testSearchComplexQueryWithOptions | correct ordering and item ###!!! ASSERTION: Removing item we don't have: 'Not Reached', file ../../../../toolkit/components/places/nsNavHistoryResult.cpp, line 3683

This hasn't failed in over a month.