https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng?numbuilds=200

https://chromium-swarm.appspot.com/task?id=379c58e51f945c10&refresh=10&show_raw=1

The error seems to be that we are leaking browser processes at the end of the tests:


Failed to delete e:\b\s\w\ir. The following files remain:
- \\?\e:\b\s\w\ir
- \\?\e:\b\s\w\ir\out
- \\?\e:\b\s\w\ir\out\Release
- \\?\e:\b\s\w\ir\out\Release\chrome.dll
- \\?\e:\b\s\w\ir\out\Release\chrome.exe
- \\?\e:\b\s\w\ir\out\Release\chrome_100_percent.pak
- \\?\e:\b\s\w\ir\out\Release\chrome_child.dll
- \\?\e:\b\s\w\ir\out\Release\chrome_elf.dll
- \\?\e:\b\s\w\ir\out\Release\d3dcompiler_47.dll
- \\?\e:\b\s\w\ir\out\Release\icudtl.dat
- \\?\e:\b\s\w\ir\out\Release\locales
- \\?\e:\b\s\w\ir\out\Release\locales\en-US.pak
- \\?\e:\b\s\w\ir\out\Release\natives_blob.bin
- \\?\e:\b\s\w\ir\out\Release\resources.pak
- \\?\e:\b\s\w\ir\out\Release\snapshot_blob.bin
- \\?\e:\b\s\w\ir\out\Release\swiftshader
- \\?\e:\b\s\w\ir\out\Release\swiftshader\libEGL.dll
- \\?\e:\b\s\w\ir\out\Release\swiftshader\libGLESv2.dll
Enumerating processes:
- pid 932; Handles: 200; Exe: e:\b\s\w\ir\out\Release\chrome.exe; Cmd: "e:\b\s\w\ir\out\Release\chrome.exe" --type=renderer --enable-logging --trace-config-file="e:\b\s\w\it6igb7o\tmpqcmcyp\chrome-trace-config.json" --v=0 --enable-gpu-benchmarking --field-trial-handle=1336,16828144388170565451,2606585767660807311,131072 --service-pipe-token=042B0DB4CE61F2E39D0D5E3E5940DEC5 --lang=en-US --noerrdialogs --user-data-dir="e:\b\s\w\it6igb7o\tmpmlxuv8" --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=true,cssExternalScannerNoPreload=false,cssExternalScannerPreload=true --enable-net-benchmarking --enable-pinch --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --enable-checker-imaging --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,3553;0,11,3553;0,12,3553;0,13,3553;0,14,3553;0,15,3553;0,16,3553;0,17,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,3553;1,11,3553;1,12,3553;1,13,3553;1,14,3553;1,15,3553;1,16,3553;1,17,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,3553;2,11,3553;2,12,3553;2,13,3553;2,14,3553;2,15,3553;2,16,3553;2,17,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,3553;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,3553;3,13,3553;3,14,3553;3,15,3553;3,16,3553;3,17,3553;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,3553;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,3553;4,13,3553;4,14,3553;4,15,3553;4,16,3553;4,17,3553 --enable-gpu-async-worker-context --service-request-channel-token=042B0DB4CE61F2E39D0D5E3E5940DEC5 --renderer-client-id=3 --mojo-platform-channel-handle=2188 /prefetch:1
- pid 4284; Handles: 91; Exe: e:\b\s\w\ir\out\Release\chrome.exe; Cmd: e:\b\s\w\ir\out\Release\chrome.exe --type=crashpad-handler --user-data-dir=e:\b\s\w\it6igb7o\tmpmlxuv8 /prefetch:7 --monitor-self --monitor-self-argument=--type=crashpad-handler --monitor-self-argument=--user-data-dir=e:\b\s\w\it6igb7o\tmpmlxuv8 --monitor-self-argument=/prefetch:7 --monitor-self-annotation=ptype=crashpad-handler --database=e:\b\s\w\it6igb7o\tmpqquqrw --metrics-dir=e:\b\s\w\it6igb7o\tmpmlxuv8 --annotation=plat=Win32 --annotation=prod=Chromium --annotation=ver=62.0.3169.0-devel --initial-client-data=0x9c,0xa0,0xa4,0x98,0xa8,0x745b0a34,0x745b0a44,0x745b0a54
- pid 4296; Handles: 73; Exe: e:\b\s\w\ir\out\Release\chrome.exe; Cmd: e:\b\s\w\ir\out\Release\chrome.exe --type=crashpad-handler --user-data-dir=e:\b\s\w\it6igb7o\tmpmlxuv8 /prefetch:7 --no-periodic-tasks --monitor-self-annotation=ptype=crashpad-handler --database=e:\b\s\w\it6igb7o\tmpqquqrw --annotation=plat=Win32 --annotation=prod=Chromium --annotation=ver=62.0.3169.0-devel --initial-client-data=0xc0,0xc4,0xc8,0xbc,0xb8,0x1050a44,0x1050a54,0x1050a64
- pid 4300; Handles: 629; Exe: e:\b\s\w\ir\out\Release\chrome.exe; Cmd: e:\b\s\w\ir\out\Release\chrome.exe --disable-features=LazyParseCSS<LazyParseCSS,TranslateRankerEnforcement<TranslateRankerModel --force-fieldtrials=AlternateComponentUrls/AlternateComponentUrls/AutofillClassifier/Enabled/AutofillCreditCardSigninPromo/EnabledThree/AutofillFieldMetadata/Enabled/AutofillProfileCleanup/Enabled/AutofillProfileOrderByFrecency/EnabledLimitTo3/AutomaticTabDiscarding/Enabled_Once_10-gen2/BackgroundVideoOptimizations/BackgroundOptimizationEnabled1sOrLessMediaSource/BrowserBlacklist/Enabled/BrowserScheduler/RedirectWithDefaultInitParams/CSSExternalScanner/Enabled_ScanAndPreload/CaptivePortalCertificateList/Enabled/CaptivePortalInterstitial/Enabled/CheckerImaging/CheckerImaging/ChildAccountDetection/Disabled/ChromeDashboard/Enabled/ChromotingQUIC/Enabled/DataReductionProxyUseQuic/Enabled/DefaultBrowserInfobar/SettingsTextNotNow/DefaultBrowserPromptStyle/ColoredLogoOnWhiteBackground/DefaultEnableGpuRasterization/DefaultEnableGpuRasterization/DelayNavigation/DelayNavigation/DesktopIOSPromotion/SavePasswordsBubblePromotionV1/DirectCompositionOverlays/DirectCompositionOverlays/DisallowFetchForDocWrittenScriptsInMainFrame/DocumentWriteScriptBlockGroup_20161208_Launch/EnableAppContainer/Enabled/EnableGoogleCachedCopyTextExperiment/Button/EnableMediaRemoting/Enabled/EnableMediaRouter/Enabled/EnableMediaRouterWithCastExtension/Enabled/EnableSessionCrashedBubbleUI/Enabled/EnableSyncClientToServerCompression/Enabled/EnableSyncUSSDeviceInfo/Enabled/ExpectCTDynamic/DynamicExpectCTEnabled/ExpectCTReporting/ExpectCTReportingEnabled/ExtensionContentVerification/Enforce/ExtensionInstallVerification/Enforce/FasterLocationReload/Enabled/GoogleBrandedContextMenu/branded/GoogleNow/Enable/GpuScheduler/Enabled/Html5ByDefault/Enabled/HttpFormWarning/Enabled/IdleTimeSpellChecking/Enabled/ImprovedRecoveryComponent/ImprovedRecoveryComponent/IncludeBetaForumMenuItem/Enabled/IncognitoWindowPromo/Enabled/InstanceID/Enabled/IntelligentSessionRestore/Enabled/LazyParseCSS/Control/LoadingWithMojo/Enabled/MaterialDesignDownloads/Enabled/MaterialDesignUserManager/Enabled/MediaFoundationH264Encoding/Enabled/MidiManagerDynamicInstantiation/Enabled/MojoChannel/Enabled/NTPCaptureThumbnail/Enabled/NTPTilesInInstantService/Enabled/NetDelayableH2AndQuicRequests/Enabled/NetworkQualityEstimator/Enabled/NetworkSchedulerYielding/Enabled/NewProfileManagement/Enabled/NewTabInProductHelp/Enabled_1/NoStatePrefetchValidation/PrerenderDisabled_R2/OfferUploadCreditCards/Enabled/OneGoogleBarOnLocalNtp/Enabled/OutOfProcessPac/Enabled/PageRevisitInstrumentation/Enabled/PassiveDocumentEventListeners/Enabled/PassiveEventListenersDueToFling/Enabled/PasswordBranding/SmartLockBrandingSavePromptOnly/PasswordGeneration/Disabled/PasswordMetadataFilling/Enabled/PasswordProtectionPasswordFieldOnFocusPing/SBEROnlyNoIncognito2/PasswordProtectionProtectedPasswordEntryPing/AllPopulation/PasswordSeparatedSigninFlow/Enabled/PasswordSmartBubble/3-Times/PermissionPromptUIViews/BlockPromptsEnabled/PersistentHistograms/EnabledOnDisk5/PreconnectMore/Enabled/PrintScaling/Enabled/QUIC/Enabled/RafAlignedMouseInput/Enabled/RafAlignedTouchInput/Enabled/RefreshTokenDeviceId/Enabled/ReportCertificateErrors/ShowAndPossiblySend/ReportingAPI/ReportingEnabled/SRTPromptFieldTrial/On/SSLCommonNameMismatchHandling/Enabled/SafeBrowsingIncidentReportingService/Enabled/SafeBrowsingIncidentReportingServiceFeatures/WithSuspiciousModuleReporting/SafeBrowsingScoutTransitionStudy/CanShowScoutOptInGroup2/SafeBrowsingThreatDomDetailsTagAttributes/AdIdentifiers/SafeBrowsingV4LocalDatabaseManagerEnabled/V4Only2/SaveAsMenuText/download/SchedulerExpensiveTaskBlocking/Enabled/SdchPersistence/Enabled/SecurityChip/Enabled/ServiceWorkerNavigationPreload/Enabled/SettingsEnforcement/enforce_always_with_extensions_and_dse/SettingsResetPrompt/Enabled/SignInPasswordPromo/Enable3/SocketReadIfReady/Enabled/SpeculativeLaunchServiceWorker/Enabled/StrictSecureCookies/Enabled/SubresourceFilter/EnabledForPhishingSites/SuperfishInterstitial/Enabled/SyncUSSAutocomplete/Enabled/SyncUserEvents/Enabled/TLS13Variant/DraftEnabled/TabSyncByRecency/Enabled/TokenBinding/TokenBinding/TranslateRankerModel/QueryExperiment2/TranslateServerStudy/SmartRendering/TranslateUI2016Q2/TranslateUI2016Q2OnGroup/TriggeredResetFieldTrial/On/UKM/Enabled/V8AsmJSToWasm/AsmJsToWebAssembly/V8CacheStrategiesForCacheStorage/default/V8Ignition/Future/VideoCaptureService/Enabled/VsyncAlignedInput/Enable/WebBluetoothBlocklist/TestGroup/WebFontsInterventionV2/Enabled-slow2g/WebRTC-EnableWebRtcEcdsa/Enabled/WebRTC-H264WithOpenH264FFmpeg/Enabled/WebRTC-LocalIPPermissionCheck/Enabled/use-new-media-cache/Enabled --enable-features=AlternateComponentUrls<AlternateComponentUrls,AutofillCreditCardSigninPromo<AutofillCreditCardSigninPromo,AutofillProfileCleanup<AutofillProfileCleanup,AutomaticTabDiscarding<AutomaticTabDiscarding,BackgroundVideoTrackOptimization<BackgroundVideoOptimizations,CaptivePortalCertificateList<CaptivePortalCertificateList,CheckerImaging<CheckerImaging,DefaultEnableGpuRasterization<DefaultEnableGpuRasterization,DelayNavigation<DelayNavigation,DesktopIOSPromotion<DesktopIOSPromotion,DirectCompositionOverlays<DirectCompositionOverlays,MediaRemoting<EnableMediaRemoting,EnableSyncClientToServerCompression<EnableSyncClientToServerCompression,EnableSyncUSSDeviceInfo<EnableSyncUSSDeviceInfo,DynamicExpectCT<ExpectCTDynamic,ExpectCTReporting<ExpectCTReporting,FasterLocationReload<FasterLocationReload,GpuScheduler<GpuScheduler,PreferHtmlOverPlugins<Html5ByDefault,HttpFormWarning<HttpFormWarning,IdleTimeSpellChecking<IdleTimeSpellChecking,ImprovedRecoveryComponent<ImprovedRecoveryComponent,IncludeBetaForumMenuItem<IncludeBetaForumMenuItem,IPH_IncognitoWindow<IncognitoWindowPromo,LoadingWithMojo<LoadingWithMojo,MaterialDesignUserManager<MaterialDesignUserManager,MediaFoundationH264Encoding<MediaFoundationH264Encoding,MidiManagerDynamicInstantiation<MidiManagerDynamicInstantiation,CaptureThumbnailDependingOnTransitionType<NTPCaptureThumbnail,CaptureThumbnailOnNavigatingAway<NTPCaptureThumbnail,NTPTilesInInstantService<NTPTilesInInstantService,PrioritySupportedRequestsDelayable<NetDelayableH2AndQuicRequests,NetworkSchedulerYielding<NetworkSchedulerYielding,IPH_NewTab<NewTabInProductHelp,NoStatePrefetch<NoStatePrefetchValidation,OneGoogleBarOnLocalNtp<OneGoogleBarOnLocalNtp,PassiveDocumentEventListeners<PassiveDocumentEventListeners,PassiveEventListenersDueToFling<PassiveEventListenersDueToFling,PasswordMetadataFilling<PasswordMetadataFilling,PasswordFieldOnFocusPinging<PasswordProtectionPasswordFieldOnFocusPing,ProtectedPasswordEntryPinging<PasswordProtectionProtectedPasswordEntryPing,UsePasswordSeparatedSigninFlow<PasswordSeparatedSigninFlow,BlockPromptsIfDismissedOften<PermissionPromptUIViews,PersistentHistograms<PersistentHistograms,PreconnectMore<PreconnectMore,PrintScaling<PrintScaling,RafAlignedMouseInput<RafAlignedMouseInput,RafAlignedTouchInput<RafAlignedTouchInput,Reporting<ReportingAPI,IncidentReportingDisableUpload<SafeBrowsingIncidentReportingService,IncidentReportingModuleLoadAnalysis<SafeBrowsingIncidentReportingServiceFeatures,IncidentReportingSuspiciousModuleReporting<SafeBrowsingIncidentReportingServiceFeatures,CanShowScoutOptIn<SafeBrowsingScoutTransitionStudy,ThreatDomDetailsTagAttributes<SafeBrowsingThreatDomDetailsTagAttributes,SafeBrowsingV4LocalDatabaseManagerEnabled<SafeBrowsingV4LocalDatabaseManagerEnabled,SafeBrowsingV4OnlyEnabled<SafeBrowsingV4LocalDatabaseManagerEnabled,SecurityChip<SecurityChip,ServiceWorkerNavigationPreload<ServiceWorkerNavigationPreload,SettingsResetPrompt<SettingsResetPrompt,SocketReadIfReady<SocketReadIfReady,SpeculativeLaunchServiceWorker<SpeculativeLaunchServiceWorker,SubresourceFilter<SubresourceFilter,SuperfishInterstitial<SuperfishInterstitial,SyncUSSAutocomplete<SyncUSSAutocomplete,SyncUserEvents<SyncUserEvents,token-binding<TokenBinding,TranslateRankerQuery<TranslateRankerModel,TranslateUI2016Q2<TranslateUI2016Q2,Ukm<UKM,AsmJsToWebAssembly<V8AsmJSToWasm,V8Future<V8Ignition,MojoVideoCapture<VideoCaptureService,RequestUnbufferedDispatch<VsyncAlignedInput,VsyncAlignedInput<VsyncAlignedInput,WebRTC-EnableWebRtcEcdsa<WebRTC-EnableWebRtcEcdsa,WebRTC-H264WithOpenH264FFmpeg<WebRTC-H264WithOpenH264FFmpeg,use-new-media-cache<use-new-media-cache --force-fieldtrial-params=AutofillCreditCardSigninPromo.EnabledThree:impression_limit/3,AutofillProfileOrderByFrecency.EnabledLimitTo3:limit/3,AutomaticTabDiscarding.Enabled_Once_10-gen2:MinimumProtectionTime/600,BackgroundVideoOptimizations.BackgroundOptimizationEnabled1sOrLessMediaSource:max_keyframe_distance_media_source_ms/1000/max_keyframe_distance_ms/0,CSSExternalScanner.Enabled_ScanAndPreload:cssExternalScannerNoPreload/false/cssExternalScannerPreload/true,DataReductionProxyUseQuic.Enabled:enable_warmup/true,DefaultBrowserPromptStyle.ColoredLogoOnWhiteBackground:IconColor/Colored/InfoBarType/PageAction,DelayNavigation.DelayNavigation:delay_millis/4/delay_probability/0%2E5/randomize_delay/true,DesktopIOSPromotion.SavePasswordsBubblePromotionV1:body_text_id/0/entry_point/SavePasswordsBubblePromotion/max_views/3/promo_variation_id/1/sms_id/19001508/title_text_id/0,DisallowFetchForDocWrittenScriptsInMainFrame.DocumentWriteScriptBlockGroup_20161208_Launch:disallowFetchForDocWrittenScriptsInMainFrame/false/disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections/true,Html5ByDefault.Enabled:engagement_threshold_for_flash/32,IncognitoWindowPromo.Enabled:availability/any/event_history_deleted/name%3Ahistory_deleted;comparator%3A>=1;window%3A3650;storage%3A3650/event_incognito_window_opened/name%3Aincognito_window_opened;comparator%3A==0;window%3A3650;storage%3A3650/event_session_time/name%3Asession_time;comparator%3A>=1;window%3A3650;storage%3A3650/event_trigger/name%3Aincognito_window_trigger;comparator%3Aany;window%3A3650;storage%3A3650/event_used/name%3Aincognito_window_clicked;comparator%3Aany;window%3A3650;storage%3A3650/session_rate/<=3,NetworkQualityEstimator.Enabled:2G%2EDefaultMedianKbps/81/2G%2EDefaultMedianRTTMsec/1337/3G%2EDefaultMedianKbps/658/3G%2EDefaultMedianRTTMsec/297/4G%2EDefaultMedianKbps/1756/4G%2EDefaultMedianRTTMsec/159/Bluetooth%2EDefaultMedianKbps/449/Bluetooth%2EDefaultMedianRTTMsec/135/Ethernet%2EDefaultMedianKbps/3263/Ethernet%2EDefaultMedianRTTMsec/106/HalfLifeSeconds/60/None%2EDefaultMedianKbps/567/None%2EDefaultMedianRTTMsec/272/Slow2G%2EThresholdMedianHttpRTTMsec/2000/Unknown%2EDefaultMedianKbps/1916/Unknown%2EDefaultMedianRTTMsec/121/WiFi%2EDefaultMedianKbps/2736/WiFi%2EDefaultMedianRTTMsec/168/correlation_logging_probability/0%2E001,NewTabInProductHelp.Enabled_1:availability/any/event_new_tab_opened/name%3Anew_tab_opened;comparator%3A==0;window%3A3650;storage%3A3650/event_omnibox_used/name%3Aomnibox_used;comparator%3A>=1;window%3A3650;storage%3A3650/event_session_time/name%3Asession_time;comparator%3A>=1;window%3A3650;storage%3A3650/event_trigger/name%3Anew_tab_trigger;comparator%3Aany;window%3A3650;storage%3A3650/event_used/name%3Anew_tab_clicked;comparator%3Aany;window%3A3650;storage%3A3650/session_rate/<=3/x_promo_string/0,NoStatePrefetchValidation.PrerenderDisabled_R2:instant_mode/simple_load/mode/simple_load/omnibox_mode/simple_load,PasswordProtectionPasswordFieldOnFocusPing.SBEROnlyNoIncognito2:extended_reporting/true/history_sync/false/incognito/false,PasswordProtectionProtectedPasswordEntryPing.AllPopulation:all_population/true/incognito/true,PasswordSmartBubble.3-Times:dismissal_count/3,PersistentHistograms.EnabledOnDisk5:send_unreported_metrics/yes/storage/MappedFile,ReportCertificateErrors.ShowAndPossiblySend:sendingThreshold/1%2E0,SafeBrowsingIncidentReportingService.Enabled:collect_reg_data/true,SafeBrowsingThreatDomDetailsTagAttributes.AdIdentifiers:tag_attribute_csv/div%2Cdata-google-query-id%2Cdiv%2Cid%2Ciframe%2Cid,SecurityChip.Enabled:animation/animate-nonsecure-only/visibility/show-all,SettingsResetPrompt.Enabled:delay_before_prompt_seconds/1/domain_hashes/{\"c027a731da03fee479b2ba00b3afe74b3fd9190f0622755db8ffa504efbde66e\"%3A\"3\"}/prompt_wave/20170101/time_between_prompts_seconds/3600,SignInPasswordPromo.Enable3:dismissal_threshold/3,SubresourceFilter.EnabledForPhishingSites:enable_presets/liverun_on_phishing_sites,TLS13Variant.DraftEnabled:variant/draft,TranslateRankerModel.QueryExperiment2:translate-ranker-model-url/https%3A%2F%2Fwww%2Egstatic%2Ecom%2Fchrome%2Fintelligence%2Fassist%2Franker%2Fmodels%2Ftranslate%2F2017%2F03%2Ftranslate_ranker_model_20170329%2Epb%2Ebin,TranslateServerStudy.SmartRendering:server_params/smrd,UKM.Enabled:RecordSessionId/true,WebBluetoothBlocklist.TestGroup:blocklist_additions/00060000%3Ae%2Cfffd%3Ae%2Ced5f25a4%3Ae --enable-net-benchmarking --metrics-recording-only --no-default-browser-check --no-first-run --enable-gpu-benchmarking --disable-background-networking --proxy-server=socks://localhost:49552 --ignore-certificate-errors --disable-component-extensions-with-background-pages --disable-default-apps --disable-search-geolocation-disclosure --enable-logging --v=0 --remote-debugging-port=0 --enable-crash-reporter-for-testing --disable-component-update --window-size=1280,1024 --user-data-dir=e:\b\s\w\it6igb7o\tmpmlxuv8 --trace-config-file=e:\b\s\w\it6igb7o\tmpqcmcyp\chrome-trace-config.json about:blank
- pid 5312; Handles: 176; Exe: e:\b\s\w\ir\out\Release\chrome.exe; Cmd: "e:\b\s\w\ir\out\Release\chrome.exe" --type=gpu-process --field-trial-handle=1336,16828144388170565451,2606585767660807311,131072 --enable-logging --trace-config-file="e:\b\s\w\it6igb7o\tmpqcmcyp\chrome-trace-config.json" --v=0 --noerrdialogs --user-data-dir="e:\b\s\w\it6igb7o\tmpmlxuv8" --disable-direct-composition --use-gl=swiftshader-webgl --supports-dual-gpus=false --gpu-driver-bug-workarounds=9,12,13,22,23,24,27,49,84 --disable-gl-extensions="GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent" --disable-accelerated-video-decode --gpu-vendor-id=0x15ad --gpu-device-id=0x0405 --gpu-driver-vendor="Google Inc." --gpu-driver-version=3.3.0.2 --gpu-driver-date=2017/04/07 --noerrdialogs --user-data-dir="e:\b\s\w\it6igb7o\tmpmlxuv8" --enable-logging --v=0 --service-request-channel-token=CC943C7FF8E3B2634D15AD32399BD0BA --mojo-platform-channel-handle=1408 --ignored=" --type=renderer " /prefetch:2
Terminating 5 processes:
- 932 killed
- 4284 killed
- 4296 killed
- 4300 killed
- 5312 killed
*** Swarming tried multiple times to delete the run directory and failed ***
*** Hard failing the task ***

Swarming detected that your testing script ran an executable, which may have
started a child executable, and the main script returned early, leaving the
children executables playing around unguided.

You don't want to leave children processes outliving the task on the Swarming
bot, do you? The Swarming bot doesn't.

How to fix?
- For any process that starts children processes, make sure all children
  processes terminated properly before each parent process exits. This is
  especially important in very deep process trees.
  - This must be done properly both in normal successful task and in case of
    task failure. Cleanup is very important.
- The Swarming bot sends a SIGTERM in case of timeout.
  - You have 30.0 seconds to comply after the signal was sent to the process
    before the process is forcibly killed.
- To achieve not leaking children processes in case of signals on timeout, you
  MUST handle signals in each executable / python script and propagate them to
  children processes.
  - When your test script (python or binary) receives a signal like SIGTERM or
    CTRL_BREAK_EVENT on Windows), send it to all children processes and wait for
    them to terminate before quitting.

See
https://github.com/luci/luci-py/blob/master/appengine/swarming/doc/Bot.md#graceful-termination-aka-the-sigterm-and-sigkill-dance
for more information.

*** May the SIGKILL force be with you ***