Filed by: philringnalda [at] gmail.com https://treeherder.mozilla.org/logviewer.html#?job_id=143774922&repo=autoland https://queue.taskcluster.net/v1/task/QV_ez8ibQCSme3AkPg5d5w/runs/0/artifacts/public/logs/live_backing.log

Recent failure log: https://treeherder.mozilla.org/logviewer.html#?job_id=157526626&repo=autoland&lineNumber=33443 8:16:12 INFO - 998 INFO TEST-START | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html 08:16:13 INFO - GECKO(9884) | TEST DEVICES: No test devices found (in media.{audio,video}_loopback_dev, using fake streams. 08:16:13 INFO - GECKO(9884) | ###!!! [Parent][MessageChannel] Error: (msgtype=0x15008F,name=PBrowser::Msg_UpdateNativeWindowHandle) Channel error: cannot send/recv 08:16:13 INFO - GECKO(9884) | ###!!! [Parent][MessageChannel] Error: (msgtype=0x150082,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv 08:22:23 INFO - Buffered messages logged at 08:16:13 08:22:23 INFO - 999 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | A valid string reason is expected 08:22:23 INFO - 1000 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Reason cannot be empty 08:22:23 INFO - 1001 INFO Call getUserMedia for {"video":{"mediaSource":"browser","scrollWithPage":true},"fake":false} 08:22:23 INFO - 1002 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | No audio tracks shall be present 08:22:23 INFO - 1003 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | One video track shall be present 08:22:23 INFO - 1004 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Track kind should be video 08:22:23 INFO - 1005 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Track id should be defined 08:22:23 INFO - 1006 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Track should not be muted 08:22:23 INFO - 1007 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Stream should be a LocalMediaStream 08:22:23 INFO - 1008 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Before starting the media element, currentTime = 0 08:22:23 INFO - 1009 INFO TEST-FAIL | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | The author of the test has indicated that flaky timeouts are expected. Reason: WebRTC inherently depends on timeouts 08:22:23 INFO - 1010 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Media element should be playing 08:22:23 INFO - 1011 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Duration should be infinity 08:22:23 INFO - 1012 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Ready state shall be HAVE_ENOUGH_DATA or HAVE_CURRENT_DATA 08:22:23 INFO - 1013 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Seekable length shall be zero 08:22:23 INFO - 1014 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Buffered length shall be zero 08:22:23 INFO - 1015 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | MediaElement is not seekable with MediaStream 08:22:23 INFO - 1016 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Start offset time shall not be a number 08:22:23 INFO - 1017 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Loop shall be false 08:22:23 INFO - 1018 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Preload should not exist 08:22:23 INFO - 1019 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | No src should be defined 08:22:23 INFO - 1020 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | Current src should still be an empty string 08:22:23 INFO - 1021 INFO TEST-FAIL | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | The author of the test has indicated that flaky timeouts are expected. Reason: WebRTC inherently depends on timeouts 08:22:23 INFO - 1022 INFO TEST-PASS | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | ended event successfully fired 08:22:23 INFO - 1023 INFO Call getUserMedia for {"video":{"mediaSource":"browser","viewportOffsetX":0,"viewportOffsetY":0,"viewportWidth":100,"viewportHeight":100},"fake":false} 08:22:23 INFO - Buffered messages finished 08:22:23 WARNING - TEST-UNEXPECTED-TIMEOUT | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | application timed out after 370 seconds with no output 08:22:23 INFO - 1024 ERROR Force-terminating active process(es). 08:22:23 INFO - Determining child pids from psutil... 08:22:23 INFO - [11296, 10448] 08:22:23 INFO - ==> process 9884 launched child process 10448 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.0.1189983089\10576532" -greomni "Z:\task_1516434806\build\application\firefox\omni.ja" -appomni "Z:\task_1516434806\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1516434806\build\application\firefox\browser" "C:\Users\GenericWorker\AppData\LocalLow\Mozilla\Temp-{cf1bb90d-b7b0-460b-ae8b-c02c32d1f23a}" 9884 "\\.\pipe\gecko-crash-server-pipe.9884" gpu) 08:22:23 INFO - ==> process 9884 launched child process 11296 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.3.1770030034\402196052" -childID 1 -isForBrowser -intPrefs 6:50|7:-1|35:1000|43:0|44:5|45:0|52:0|58:128|59:10000|64:0|66:400|67:1|68:0|69:0|70:100|75:0|76:120|77:120|160:2|161:1|165:60|166:30|167:1000|176:0|178:0|192:32|193:256|194:5|207:10000|228:24|229:32768|231:0|232:0|241:2|245:1048576|247:100|248:5000|250:600|252:1|260:20|277:5|281:0|290:60000|308:300|309:30| -boolPrefs 1:0|2:0|4:1|5:1|25:1|28:1|29:1|30:1|32:1|33:1|34:1|37:1|38:1|39:1|42:1|46:1|47:0|48:0|49:1|50:1|51:1|53:0|56:1|57:1|60:1|61:0|62:0|63:0|65:0|71:1|72:1|73:1|74:1|78:1|79:1|80:0|81:0|82:1|83:1|84:1|85:1|88:0|89:0|92:1|93:1|97:1|98:1|99:0|100:0|101:0|102:0|104:0|105:0|106:1|107:1|108:1|111:1|112:1|113:1|114:1|115:1|116:0|117:1|118:1|119:0|120:0|121:1|122:1|123:0|124:1|125:1|126:1|128:1|129:1|130:1|131:1|132:0|133:0|134:0|135:1|136:1|137:1|138:1|139:1|140:1|141:1|142:1|143:1|144:1|145:1|146:0|147:1|148:1|149:0|150:1|151:1|153:0|154:0|155:0|156:1|157:1|158:1|159:1|162:1|163:0|170:1|173:0|174:0|175:1|179:1|182:0|183:1|185:1|187:0|189:1|191:1|195:1|196:0|197:1|198:1|199:0|202:1|206:1|208:0|209:0|211:1|214:0|220:0|221:1|222:0|223:1|226:0|227:0|230:1|233:0|235:1|236:1|238:1|239:0|246:1|249:1|254:0|255:0|256:0|257:1|258:1|259:0|264:1|267:1|268:1|269:1|270:1|271:1|272:0|273:1|279:0|282:1|283:0|284:1|285:1|286:0|287:1|288:1|289:1|291:0|292:0|294:0|303:1|304:1|305:0|306:0|307:0| -stringPrefs "3:7;default|152:0;|213:4;0.01|224:332; ����!==> process 9884 launched child process 7808 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.13.445711089\784603930" -childID 2 -isForBrowser -intPrefs 6:50|7:-1|35:1000|43:0|44:5|45:0|52:0|58:128|59:10000|64:0|66:400|67:1|68:0|69:0|70:100|75:0|76:120|77:120|160:2|161:1|165:60|166:30|167:1000|176:0|178:0|192:32|193:256|194:5|207:10000|228:24|229:32768|231:0|232:0|241:2|245:1048576|247:100|248:5000|250:600|252:1|260:20|277:5|281:0|290:60000|308:300|309:30| -boolPrefs 1:0|2:0|4:1|5:1|25:1|28:1|29:1|30:1|32:1|33:1|34:1|37:1|38:1|39:1|42:1|46:1|47:0|48:0|49:1|50:1|51:1|53:0|56:1|57:1|60:1|61:0|62:0|63:0|65:0|71:1|72:1|73:1|74:1|78:1|79:1|80:0|81:0|82:1|83:1|84:1|85:1|88:0|89:0|92:1|93:1|97:1|98:1|99:0|100:0|101:0|102:0|104:0|105:0|106:1|107:1|108:1|111:1|112:1|113:1|114:1|115:1|116:0|117:1|118:1|119:0|120:0|121:1|122:1|123:0|124:1|125:1|126:1|128:1|129:1|130:1|131:1|132:0|133:0|134:0|135:1|136:1|137:1|138:1|139:1|140:1|141:1|142:1|143:1|144:1|145:1|146:0|147:1|148:1|149:0|150:1|151:1|153:0|154:0|155:0|156:1|157:1|158:1|159:1|162:1|163:0|170:1|173:0|174:0|175:1|179:1|182:0|183:1|185:1|187:0|189:1|191:1|195:1|196:0|197:1|198:1|199:0|202:1|206:1|208:0|209:0|211:1|214:0|220:0|221:1|222:0|223:1|226:0|227:0|230:1|233:0|235:1|236:1|238:1|239:0|246:1|249:1|254:0|255:0|256:0|257:1|258:1|259:0|264:1|267:1|268:1|269:1|270:1|271:1|272:0|273:1|279:0|282:1|283:0|284:1|285:1|286:0|287:1|288:1|289:1|291:0|292:0|294:0|303:1|304:1|305:0|306:0|307:0| -stringPrefs "3:7;default|152:0;|213:4;0.01|224:332; ����! 08:22:23 INFO - Found child pids: set([11296, 10448]) 08:22:23 INFO - Killing process: 11296 08:22:23 INFO - TEST-INFO | started process screenshot 08:22:23 INFO - TEST-INFO | screenshot: exit 0 08:22:24 INFO - mozcrash kill_pid(): wait failed (-1) terminating pid 11296: error 5 08:22:24 INFO - Killing process: 10448 08:22:24 INFO - Not taking screenshot here: see the one that was previously logged 08:22:24 INFO - mozcrash kill_pid(): wait failed (-1) terminating pid 10448: error 5 08:22:24 INFO - psutil found pid 11296 dead 08:22:24 INFO - psutil found pid 10448 dead 08:22:24 INFO - Killing process: 9884 08:22:24 INFO - Not taking screenshot here: see the one that was previously logged 08:22:24 INFO - mozcrash kill_pid(): wait failed (-1) terminating pid 9884: error 5 08:22:24 INFO - psutil found pid 9884 dead 08:22:24 INFO - TEST-INFO | Main app process: exit 1 08:22:24 INFO - Buffered messages finished 08:22:24 ERROR - 1025 ERROR TEST-UNEXPECTED-FAIL | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | application terminated with exit code 1 08:22:24 INFO - runtests.py | Application ran for: 0:06:37.601000 08:22:24 INFO - zombiecheck | Reading PID log: c:\users\genericworker\appdata\local\temp\tmp1ast0xpidlog 08:22:24 INFO - ==> process 9884 launched child process 10448 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.0.1189983089\10576532" -greomni "Z:\task_1516434806\build\application\firefox\omni.ja" -appomni "Z:\task_1516434806\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1516434806\build\application\firefox\browser" "C:\Users\GenericWorker\AppData\LocalLow\Mozilla\Temp-{cf1bb90d-b7b0-460b-ae8b-c02c32d1f23a}" 9884 "\\.\pipe\gecko-crash-server-pipe.9884" gpu) 08:22:24 INFO - ==> process 9884 launched child process 11296 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.3.1770030034\402196052" -childID 1 -isForBrowser -intPrefs 6:50|7:-1|35:1000|43:0|44:5|45:0|52:0|58:128|59:10000|64:0|66:400|67:1|68:0|69:0|70:100|75:0|76:120|77:120|160:2|161:1|165:60|166:30|167:1000|176:0|178:0|192:32|193:256|194:5|207:10000|228:24|229:32768|231:0|232:0|241:2|245:1048576|247:100|248:5000|250:600|252:1|260:20|277:5|281:0|290:60000|308:300|309:30| -boolPrefs 1:0|2:0|4:1|5:1|25:1|28:1|29:1|30:1|32:1|33:1|34:1|37:1|38:1|39:1|42:1|46:1|47:0|48:0|49:1|50:1|51:1|53:0|56:1|57:1|60:1|61:0|62:0|63:0|65:0|71:1|72:1|73:1|74:1|78:1|79:1|80:0|81:0|82:1|83:1|84:1|85:1|88:0|89:0|92:1|93:1|97:1|98:1|99:0|100:0|101:0|102:0|104:0|105:0|106:1|107:1|108:1|111:1|112:1|113:1|114:1|115:1|116:0|117:1|118:1|119:0|120:0|121:1|122:1|123:0|124:1|125:1|126:1|128:1|129:1|130:1|131:1|132:0|133:0|134:0|135:1|136:1|137:1|138:1|139:1|140:1|141:1|142:1|143:1|144:1|145:1|146:0|147:1|148:1|149:0|150:1|151:1|153:0|154:0|155:0|156:1|157:1|158:1|159:1|162:1|163:0|170:1|173:0|174:0|175:1|179:1|182:0|183:1|185:1|187:0|189:1|191:1|195:1|196:0|197:1|198:1|199:0|202:1|206:1|208:0|209:0|211:1|214:0|220:0|221:1|222:0|223:1|226:0|227:0|230:1|233:0|235:1|236:1|238:1|239:0|246:1|249:1|254:0|255:0|256:0|257:1|258:1|259:0|264:1|267:1|268:1|269:1|270:1|271:1|272:0|273:1|279:0|282:1|283:0|284:1|285:1|286:0|287:1|288:1|289:1|291:0|292:0|294:0|303:1|304:1|305:0|306:0|307:0| -stringPrefs "3:7;default|152:0;|213:4;0.01|224:332; ����!==> process 9884 launched child process 7808 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.13.445711089\784603930" -childID 2 -isForBrowser -intPrefs 6:50|7:-1|35:1000|43:0|44:5|45:0|52:0|58:128|59:10000|64:0|66:400|67:1|68:0|69:0|70:100|75:0|76:120|77:120|160:2|161:1|165:60|166:30|167:1000|176:0|178:0|192:32|193:256|194:5|207:10000|228:24|229:32768|231:0|232:0|241:2|245:1048576|247:100|248:5000|250:600|252:1|260:20|277:5|281:0|290:60000|308:300|309:30| -boolPrefs 1:0|2:0|4:1|5:1|25:1|28:1|29:1|30:1|32:1|33:1|34:1|37:1|38:1|39:1|42:1|46:1|47:0|48:0|49:1|50:1|51:1|53:0|56:1|57:1|60:1|61:0|62:0|63:0|65:0|71:1|72:1|73:1|74:1|78:1|79:1|80:0|81:0|82:1|83:1|84:1|85:1|88:0|89:0|92:1|93:1|97:1|98:1|99:0|100:0|101:0|102:0|104:0|105:0|106:1|107:1|108:1|111:1|112:1|113:1|114:1|115:1|116:0|117:1|118:1|119:0|120:0|121:1|122:1|123:0|124:1|125:1|126:1|128:1|129:1|130:1|131:1|132:0|133:0|134:0|135:1|136:1|137:1|138:1|139:1|140:1|141:1|142:1|143:1|144:1|145:1|146:0|147:1|148:1|149:0|150:1|151:1|153:0|154:0|155:0|156:1|157:1|158:1|159:1|162:1|163:0|170:1|173:0|174:0|175:1|179:1|182:0|183:1|185:1|187:0|189:1|191:1|195:1|196:0|197:1|198:1|199:0|202:1|206:1|208:0|209:0|211:1|214:0|220:0|221:1|222:0|223:1|226:0|227:0|230:1|233:0|235:1|236:1|238:1|239:0|246:1|249:1|254:0|255:0|256:0|257:1|258:1|259:0|264:1|267:1|268:1|269:1|270:1|271:1|272:0|273:1|279:0|282:1|283:0|284:1|285:1|286:0|287:1|288:1|289:1|291:0|292:0|294:0|303:1|304:1|305:0|306:0|307:0| -stringPrefs "3:7;default|152:0;|213:4;0.01|224:332; ����!==> process 9884 launched child process 1168 ("Z:\task_1516434806\build\application\firefox\firefox.exe" -contentproc --channel="9884.20.1825345855\1797275652" -greomni "Z:\task_1516434806\build\application\firefox\omni.ja" -appomni "Z:\task_1516434806\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1516434806\build\application\firefox\browser" "C:\Users\GenericWorker\AppData\LocalLow\Mozilla\Temp-{cf1bb90d-b7b0-460b-ae8b-c02c32d1f23a}" 9884 "\\.\pipe\gecko-crash-server-pipe.9884" gpu) 08:22:24 INFO - zombiecheck | Checking for orphan process with PID: 10448 08:22:24 INFO - zombiecheck | Checking for orphan process with PID: 11296 08:22:24 INFO - mozcrash Downloading symbols from: https://queue.taskcluster.net/v1/task/Iob2v10QTHq4D4lf0-kQrw/artifacts/public/build/target.crashreporter-symbols.zip 08:22:29 INFO - mozcrash Copy/paste: Z:\task_1516434806\build\win32-minidump_stackwalk.exe c:\users\genericworker\appdata\local\temp\tmpp2micg.mozrunner\minidumps\21c942d7-8f7c-47e2-8ae9-6832d68310c0.dmp c:\users\genericworker\appdata\local\temp\tmpqfpfmq 08:22:36 INFO - mozcrash Saved minidump as Z:\task_1516434806\build\blobber_upload_dir\21c942d7-8f7c-47e2-8ae9-6832d68310c0.dmp 08:22:36 WARNING - PROCESS-CRASH | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | application crashed [None] 08:22:36 INFO - Crash dump filename: c:\users\genericworker\appdata\local\temp\tmpp2micg.mozrunner\minidumps\21c942d7-8f7c-47e2-8ae9-6832d68310c0.dmp 08:22:36 INFO - Operating system: Windows NT 08:22:36 INFO - 10.0.15063 08:22:36 INFO - CPU: amd64 08:22:36 INFO - family 6 model 62 stepping 4 08:22:36 INFO - 8 CPUs 08:22:36 INFO - GPU: UNKNOWN 08:22:36 INFO - No crash 08:22:36 INFO - Process uptime: 396 seconds 08:22:36 INFO - Thread 0 08:22:36 INFO - 0 ntdll.dll!NtWaitForMultipleObjects + 0x14 08:22:36 INFO - rax = 0x0000000000000001 rdx = 0x0000000000000000 08:22:36 INFO - rcx = 0x000000e49b1fef90 rbx = 0x0000000000000001 08:22:36 INFO - rsi = 0x0000000000000001 rdi = 0x0000000000000001 08:22:36 INFO - rbp = 0x000002b4ce870740 rsp = 0x000000e49b1feaf8 08:22:36 INFO - r8 = 0x0000000000000000 r9 = 0x0000000000000000 08:22:36 INFO - r10 = 0x0000000000000000 r11 = 0x000000e49b1fef50 08:22:36 INFO - r12 = 0x00000000ffffffff r13 = 0x000000e49b1fee40 08:22:36 INFO - r14 = 0x0000000000000000 r15 = 0x0000000000000000 08:22:36 INFO - rip = 0x00007ffed59e5ef4 08:22:36 INFO - Found by: given as instruction pointer in context 08:22:36 INFO - 1 KERNELBASE.dll!SbCleanupTrace + 0x28 08:22:36 INFO - rbx = 0x0000000000000001 rbp = 0x000002b4ce870740 08:22:36 INFO - rsp = 0x000000e49b1feb00 r12 = 0x00000000ffffffff 08:22:36 INFO - r13 = 0x000000e49b1fee40 r14 = 0x0000000000000000 08:22:36 INFO - r15 = 0x0000000000000000 rip = 0x00007ffed2aadd20 08:22:36 INFO - Found by: call frame info 08:22:36 INFO - 2 xul.dll!std::_Push_heap_unchecked<mozilla::ArrayIterator<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &,nsTArray<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > > >,bool (*)(mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &,mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &)>(mozilla::ArrayIterator<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &,nsTArray<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > > >,mozilla::ArrayIterator<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &,nsTArray<mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > > >,bool (*&)(mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &,mozilla::UniquePtr<TimerThread::Entry,mozilla::DefaultDelete<TimerThread::Entry> > &)) [algorithm:2082870a97c2 : 2068 + 0x1f] 08:22:36 INFO - rbx = 0x0000000000000001 rbp = 0x000002b4ce870740 08:22:36 INFO - rsp = 0x000000e49b1feb30 r12 = 0x00000000ffffffff 08:22:36 INFO - r13 = 0x000000e49b1fee40 r14 = 0x0000000000000000 08:22:36 INFO - r15 = 0x0000000000000000 rip = 0x00007ffea5fe3e94 08:22:36 INFO - Found by: call frame info 08:22:36 INFO - Thread 1 08:22:36 INFO - 0 ntdll.dll!NtRemoveIoCompletion + 0x14 08:22:36 INFO - rax = 0x0000000000000001 rdx = 0x0000000000000000 08:22:36 INFO - rcx = 0x0000000000000000 rbx = 0x000000e49b3ff720 08:22:36 INFO - rsi = 0x0000000000000000 rdi = 0x000000e49b3ff750 08:22:36 INFO - rbp = 0x00000000ffffffff rsp = 0x000000e49b3ff678 08:22:36 INFO - r8 = 0x000000e49b3ff678 r9 = 0x00000000ffffffff 08:22:36 INFO - r10 = 0x0000000000000000 r11 = 0x0000000000000246 08:22:36 INFO - r12 = 0x0000000000000000 r13 = 0x0000000000000000 08:22:36 INFO - r14 = 0x0000000000000000 r15 = 0x0000000000000000 08:22:36 INFO - rip = 0x00007ffed59e54c4 08:22:36 INFO - Found by: given as instruction pointer in context 08:22:36 INFO - 1 KERNELBASE.dll!LdrResGetRCConfig + 0x40f 08:22:36 INFO - rbx = 0x000000e49b3ff720 rbp = 0x00000000ffffffff 08:22:36 INFO - rsp = 0x000000e49b3ff680 r12 = 0x0000000000000000 08:22:36 INFO - r13 = 0x0000000000000000 r14 = 0x0000000000000000 08:22:36 INFO - r15 = 0x0000000000000000 rip = 0x00007ffed2ab9aff 08:22:36 INFO - Found by: call frame info

This Bug has failed 30 times in the last 7 days on Windows 10 affecting opt build type. Failing test: opt-mochitest-media-e10 Link to a recent log: https://treeherder.mozilla.org/logviewer.html#?repo=autoland&job_id=164130287&lineNumber=10167 Part of that log: 14:19:53 INFO - Buffered messages finished 14:19:53 WARNING - TEST-UNEXPECTED-TIMEOUT | dom/media/tests/mochitest/test_getUserMedia_basicTabshare.html | application timed out after 370 seconds with no output 14:19:53 INFO - 1028 ERROR Force-terminating active process(es). 14:19:53 INFO - Determining child pids from psutil... 14:19:53 INFO - [9864, 11644] 14:19:53 INFO - ==> process 11008 launched child process 9864 ("Z:\task_1519480315\build\application\firefox\firefox.exe" -contentproc --channel="11008.0.765791478\1944464447" -greomni "Z:\task_1519480315\build\application\firefox\omni.ja" -appomni "Z:\task_1519480315\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1519480315\build\application\firefox\browser" "C:\Users\GenericWorker\AppData\LocalLow\Mozilla\Temp-{627c6495-306c-4cfe-8012-ecf66c36b2d9}" 11008 "\\.\pipe\gecko-crash-server-pipe.11008" 1660 gpu) 14:19:53 INFO - ==> process 11008 launched child process 11644 ("Z:\task_1519480315\build\application\firefox\firefox.exe" -contentproc --channel="11008.3.1434301402\1079964146" -childID 1 -isForBrowser -intPrefs 43:0|45:0|64:0|69:0|75:0|169:1000|178:0|180:0|194:32|195:256|243:2| -boolPrefs 5:1|37:1|60:1|61:0|120:1|129:1|133:1|143:1|148:1|155:1|181:1|193:1|210:0|295:0| -stringPrefs 215:4;0.01|281:38;{627c6495-306c-4cfe-8012-ecf66c36b2d9}| -schedulerPrefs 0001,2 -greomni "Z:\task_1519480315\build\application\firefox\omni.ja" -appomni "Z:\task_1519480315\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1519480315\build\application\firefox\browser" 11008 "\\.\pipe\gecko-crash-server-pipe.11008" 2388 tab) 14:19:53 INFO - ==> process 11008 launched child process 10580 ("Z:\task_1519480315\build\application\firefox\firefox.exe" -contentproc --channel="11008.13.1373270926\122084424" -childID 2 -isForBrowser -intPrefs 43:0|45:0|64:0|69:0|75:0|169:1000|178:0|180:0|194:32|195:256|243:2| -boolPrefs 5:1|37:1|60:1|61:0|120:1|129:1|133:1|143:1|148:1|155:1|181:1|193:1|210:0|295:0| -stringPrefs 215:4;0.01|281:38;{627c6495-306c-4cfe-8012-ecf66c36b2d9}| -schedulerPrefs 0001,2 -greomni "Z:\task_1519480315\build\application\firefox\omni.ja" -appomni "Z:\task_1519480315\build\application\firefox\browser\omni.ja" -appdir "Z:\task_1519480315\build\application\firefox\browser" :drno could you please take a look at this bug?

This looks to me like another intermittent caused by gUM timeouts. Windows specific only in this case.