Filed by: csabou [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=282057310&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/C9U_8oYZTZSBiETyeMo3hg/runs/0/artifacts/public/logs/live_backing.log

[task 2019-12-20T07:54:04.950Z] 07:54:04 INFO - TEST-START | /xhr/send-blob-with-no-mime-type.html
[task 2019-12-20T07:54:04.993Z] 07:54:04 INFO - Closing window 507
[task 2019-12-20T07:54:05.144Z] 07:54:05 INFO - PID 10844 | ###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost
[task 2019-12-20T07:54:05.169Z] 07:54:05 INFO - PID 10844 | [Child 12324, Main Thread] WARNING: NS_ENSURE_TRUE(mPresShell) failed: file z:/build/build/src/layout/base/nsPresContext.cpp, line 848
[task 2019-12-20T07:54:05.452Z] 07:54:05 INFO - PID 10844 | DLL blocklist was unable to intercept AppInit DLLs.
[task 2019-12-20T07:54:05.471Z] 07:54:05 INFO - PID 10844 | ### XPCOM_MEM_BLOAT_LOG defined -- logging bloat/leaks to c:\users\task_1576819064\appdata\local\temp\tmp1mi4sx.mozrunner\runtests_leaks_4028_tab_pid13620.log
[task 2019-12-20T07:54:05.489Z] 07:54:05 INFO - PID 10844 | [Child 13620, Main Thread] WARNING: No CID found when attempting to map contract ID: file z:/build/build/src/xpcom/components/nsComponentManager.cpp, line 721
[task 2019-12-20T07:54:05.508Z] 07:54:05 INFO - PID 10844 | Assertion failure: js::gc::IsCellPointerValid(str), at z:/build/build/src/obj-firefox/dist/include/js/Value.h:437
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - STDERR: Exception in thread ProcessReader:
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - Traceback (most recent call last):
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - File "c:\mozilla-build\python\Lib\threading.py", line 801, in __bootstrap_inner
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - self.run()
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - File "c:\mozilla-build\python\Lib\threading.py", line 754, in run
[task 2019-12-20T07:54:05.769Z] 07:54:05 INFO - self.__target(*self.__args, **self.__kwargs)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\venv\lib\site-packages\mozprocess\processhandler.py", line 1085, in _read
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - callback(line.rstrip())
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\venv\lib\site-packages\mozprocess\processhandler.py", line 995, in call
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - e(*args, **kwargs)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\web-platform\tests\tools\wptrunner\wptrunner\browsers\firefox.py", line 435, in on_output
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - data = self.stack_fixer(data)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\venv\lib\site-packages\mozrunner\utils.py", line 260, in stack_fixer_function
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - return stack_fixer_module.fixSymbols(line, symbolsPath)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\bin\fix_stack_using_bpsyms.py", line 196, in fixSymbols
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - symbol = addressToSymbol(file, address, symbolsDir)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\bin\fix_stack_using_bpsyms.py", line 180, in addressToSymbol
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - p = getSymbolFile(file, symbolsDir)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\bin\fix_stack_using_bpsyms.py", line 168, in getSymbolFile
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - symfile = guessSymbolFile(file, symbolsDir)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\bin\fix_stack_using_bpsyms.py", line 156, in guessSymbolFile
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - uuid = findIdForPath(full_path)
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "Z:\task_1576819064\build\tests\bin\fix_stack_using_bpsyms.py", line 136, in findIdForPath
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - return subprocess.check_output([fileid_exe, path]).rstrip()
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - File "c:\mozilla-build\python\Lib\subprocess.py", line 216, in check_output
[task 2019-12-20T07:54:05.770Z] 07:54:05 INFO - process = Popen(stdout=PIPE, *popenargs, **kwargs)
[task 2019-12-20T07:54:05.771Z] 07:54:05 INFO - File "c:\mozilla-build\python\Lib\subprocess.py", line 394, in init
[task 2019-12-20T07:54:05.771Z] 07:54:05 INFO - errread, errwrite)
[task 2019-12-20T07:54:05.771Z] 07:54:05 INFO - File "c:\mozilla-build\python\Lib\subprocess.py", line 644, in _execute_child
[task 2019-12-20T07:54:05.771Z] 07:54:05 INFO - startupinfo)
[task 2019-12-20T07:54:05.771Z] 07:54:05 INFO - WindowsError: [Error 1455] The paging file is too small for this operation to complete
[task 2019-12-20T07:54:06.184Z] 07:54:06 INFO - NoSuchWindowException on command, setting status to CRASH
[task 2019-12-20T07:54:06.435Z] 07:54:06 INFO - mozcrash Copy/paste: Z:\task_1576819064\build\win32-minidump_stackwalk.exe c:\users\task_1576819064\appdata\local\temp\tmp1mi4sx.mozrunner\minidumps\4a57bb49-4e68-4d4e-b949-c1d63131e5ba.dmp Z:\task_1576819064\build\symbols
[task 2019-12-20T07:54:24.436Z] 07:54:24 INFO - mozcrash Saved minidump as Z:\task_1576819064\build\blobber_upload_dir\4a57bb49-4e68-4d4e-b949-c1d63131e5ba.dmp
[task 2019-12-20T07:54:24.436Z] 07:54:24 INFO - PROCESS-CRASH | /xhr/send-blob-with-no-mime-type.html | application crashed [None]

Reading the minidump failed and there's this in the log:

WindowsError: [Error 1455] The paging file is too small for this operation to complete

It would be interesting to see if there are any instances of this where we get a stack trace.

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.