The debug instances of this failure have a backtrace, which seems to indicate that this is/was indeed a gecko bug rather than a harness bug: ``` [task 2024-05-02T16:08:58.007Z] 16:08:58 INFO - PID 869 | [Parent 869, Main Thread] WARNING: NS_ENSURE_TRUE(uri) failed: file /builds/worker/checkouts/gecko/caps/BasePrincipal.cpp:1494 [task 2024-05-02T16:08:58.041Z] 16:08:58 INFO - PID 869 | 2024-05-02 16:08:58.040 firefox[869:11728] Mozilla has caught an Obj-C exception [NSGenericException: *** Collection <__NSArrayM: 0x129790370> was mutated while being enumerated.] [task 2024-05-02T16:08:58.066Z] 16:08:58 INFO - PID 869 | 2024-05-02 16:08:58.065 firefox[869:11728] Stack trace: [task 2024-05-02T16:08:58.066Z] 16:08:58 INFO - PID 869 | ( [task 2024-05-02T16:08:58.067Z] 16:08:58 INFO - PID 869 | 0 CoreFoundation 0x00007fff2e8d1b57 __exceptionPreprocess + 250 [task 2024-05-02T16:08:58.067Z] 16:08:58 INFO - PID 869 | 1 libobjc.A.dylib 0x00007fff675b55bf objc_exception_throw + 48 [task 2024-05-02T16:08:58.068Z] 16:08:58 INFO - PID 869 | 2 CoreFoundation 0x00007fff2e94a30b __NSFastEnumerationMutationHandler + 159 [task 2024-05-02T16:08:58.068Z] 16:08:58 INFO - PID 869 | 3 XUL 0x0000000109f6a3a5 _ZN13nsCocoaWindow16HideWindowChromeEb + 373 [task 2024-05-02T16:08:58.069Z] 16:08:58 INFO - PID 869 | 4 XUL 0x000000010b344830 _ZN7mozilla9AppWindow22SyncAttributesToWidgetEv + 464 [task 2024-05-02T16:08:58.070Z] 16:08:58 INFO - PID 869 | 5 XUL 0x000000010b34caae _ZThn16_N7mozilla9AppWindow17BeforeStartLayoutEv + 30 [task 2024-05-02T16:08:58.070Z] 16:08:58 INFO - PID 869 | 6 XUL 0x00000001069a1589 _ZN7mozilla3dom8Document17SetMayStartLayoutEb + 169 [task 2024-05-02T16:08:58.071Z] 16:08:58 INFO - PID 869 | 7 XUL 0x00000001094d37db _ZN7mozilla3dom28PrototypeDocumentContentSink11StartLayoutEv + 315 [task 2024-05-02T16:08:58.071Z] 16:08:58 INFO - PID 869 | 8 XUL 0x00000001094d3222 _ZN7mozilla3dom28PrototypeDocumentContentSink11DoneWalkingEv + 242 [task 2024-05-02T16:08:58.072Z] 16:08:58 INFO - PID 869 | 9 XUL 0x00000001094d308f _ZN7mozilla3dom28PrototypeDocumentContentSink16MaybeDoneWalkingEv + 63 [task 2024-05-02T16:08:58.072Z] 16:08:58 INFO - PID 869 | 10 XUL 0x00000001094d239b _ZN7mozilla3dom28PrototypeDocumentContentSink18ResumeWalkInternalEv + 2251 [task 2024-05-02T16:08:58.073Z] 16:08:58 INFO - PID 869 | 11 XUL 0x00000001094d4014 _ZN7mozilla3dom28PrototypeDocumentContentSink23OnScriptCompileCompleteEPN2js8frontend18CompilationStencilE8nsresult + 196 [task 2024-05-02T16:08:58.074Z] 16:08:58 INFO - PID 869 | 12 XUL 0x00000001094d3d4e _ZN7mozilla3dom28PrototypeDocumentContentSink16OnStreamCompleteEP15nsIStreamLoaderP11nsISupports8nsresultjPKh + 718 [task 2024-05-02T16:08:58.074Z] 16:08:58 INFO - PID 869 | 13 XUL 0x00000001055c7f94 _ZN7mozilla3net14nsStreamLoader13OnStopRequestEP10nsIRequest8nsresult + 164 [task 2024-05-02T16:08:58.076Z] 16:08:58 INFO - PID 869 | 14 XUL 0x0000000105f75786 _ZN12nsJARChannel13OnStopRequestEP10nsIRequest8nsresult + 150 [task 2024-05-02T16:08:58.076Z] 16:08:58 INFO - PID 869 | 15 XUL 0x0000000105f7883d _ZThn32_N12nsJARChannel13OnStopRequestEP10nsIRequest8nsresult + 13 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 16 XUL 0x0000000105546780 _ZN17nsInputStreamPump11OnStateStopEv + 832 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 17 XUL 0x00000001055458af _ZN17nsInputStreamPump18OnInputStreamReadyEP19nsIAsyncInputStream + 287 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 18 XUL 0x0000000105546a6d _ZThn24_N17nsInputStreamPump18OnInputStreamReadyEP19nsIAsyncInputStream + 13 [task 2024-05-02T16:08:58.078Z] 16:08:58 INFO - PID 869 | 19 XUL 0x00000001052c6750 _ZZ32NS_NewCancelableRunnableFunctionIZN14CallbackHolderC1EP19nsIAsyncInputStreamP22nsIInputStreamCallbackjP14nsIEventTargetEUlvE_E16already_AddRefedIN7mozilla18CancelableRunnableEEPKcOT_EN22FuncCancelableRunnable3RunEv + 32 [task 2024-05-02T16:08:58.078Z] 16:08:58 INFO - PID 869 | 20 XUL 0x000000010530e4a8 _ZN7mozilla12RunnableTask3RunEv + 24 [task 2024-05-02T16:08:58.079Z] 16:08:58 INFO - PID 869 | 21 XUL 0x00000001053037e6 _ZN7mozilla14TaskController39DoExecuteNextTaskOnlyMainThreadInternalERKNS_6detail12BaseAutoLockIRNS_5MutexEEE + 1990 [task 2024-05-02T16:08:58.080Z] 16:08:58 INFO - PID 869 | 22 XUL 0x00000001053021c9 _ZN7mozilla14TaskController37ExecuteNextTaskOnlyMainThreadInternalERKNS_6detail12BaseAutoLockIRNS_5MutexEEE + 89 [task 2024-05-02T16:08:58.080Z] 16:08:58 INFO - PID 869 | 23 XUL 0x00000001053026a7 _ZN7mozilla14TaskController20ProcessPendingMTTaskEb + 103 [task 2024-05-02T16:08:58.081Z] 16:08:58 INFO - PID 869 | 24 XUL 0x0000000105313787 _ZN7mozilla6detail16RunnableFunctionIZNS_14TaskControllerC1EvE3$_0E3RunEv + 23 [task 2024-05-02T16:08:58.081Z] 16:08:58 INFO - PID 869 | 25 XUL 0x0000000105328e98 _ZN8nsThread16ProcessNextEventEbPb + 1912 [task 2024-05-02T16:08:58.082Z] 16:08:58 INFO - PID 869 | 26 XUL 0x000000010532530c _Z23NS_ProcessPendingEventsP9nsIThreadj + 172 [task 2024-05-02T16:08:58.082Z] 16:08:58 INFO - PID 869 | 27 XUL 0x0000000109eced62 _ZN14nsBaseAppShell19NativeEventCallbackEv + 114 [task 2024-05-02T16:08:58.083Z] 16:08:58 INFO - PID 869 | 28 XUL 0x0000000109f5cda0 _ZN10nsAppShell18ProcessGeckoEventsEPv + 304 [task 2024-05-02T16:08:58.083Z] 16:08:58 INFO - PID 869 | 29 CoreFoundation 0x00007fff2e855d52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 [task 2024-05-02T16:08:58.084Z] 16:08:58 INFO - PID 869 | 30 CoreFoundation 0x00007fff2e855cf1 __CFRunLoopDoSource0 + 103 [task 2024-05-02T16:08:58.085Z] 16:08:58 INFO - PID 869 | 31 CoreFoundation 0x00007fff2e855b0b __CFRunLoopDoSources0 + 209 [task 2024-05-02T16:08:58.085Z] 16:08:58 INFO - PID 869 | 32 CoreFoundation 0x00007fff2e85483a __CFRunLoopRun + 927 [task 2024-05-02T16:08:58.086Z] 16:08:58 INFO - PID 869 | 33 CoreFoundation 0x00007fff2e853e3e CFRunLoopRunSpecific + 462 [task 2024-05-02T16:08:58.086Z] 16:08:58 INFO - PID 869 | 34 HIToolbox 0x00007fff2d480abd RunCurrentEventLoopInMode + 292 [task 2024-05-02T16:08:58.087Z] 16:08:58 INFO - PID 869 | 35 HIToolbox 0x00007fff2d4807d5 ReceiveNextEventCommon + 584 [task 2024-05-02T16:08:58.087Z] 16:08:58 INFO - PID 869 | 36 HIToolbox 0x00007fff2d480579 _BlockUntilNextEventMatchingListInModeWithFilter + 64 [task 2024-05-02T16:08:58.088Z] 16:08:58 INFO - PID 869 | 37 AppKit 0x00007fff2bac6039 _DPSNextEvent + 883 [task 2024-05-02T16:08:58.088Z] 16:08:58 INFO - PID 869 | 38 AppKit 0x00007fff2bac4880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352 [task 2024-05-02T16:08:58.089Z] 16:08:58 INFO - PID 869 | 39 XUL 0x0000000109f5c0bf -[GeckoNSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 175 [task 2024-05-02T16:08:58.089Z] 16:08:58 INFO - PID 869 | 40 AppKit 0x00007fff2bab658e -[NSApplication run] + 658 [task 2024-05-02T16:08:58.090Z] 16:08:58 INFO - PID 869 | 41 XUL 0x0000000109f5bed0 -[GeckoNSApplication run] + 64 [task 2024-05-02T16:08:58.090Z] 16:08:58 INFO - PID 869 | 42 XUL 0x0000000109f5d580 _ZN10nsAppShell3RunEv + 576 [task 2024-05-02T16:08:58.091Z] 16:08:58 INFO - PID 869 | 43 XUL 0x000000010b875a8c _ZN12nsAppStartup3RunEv + 108 [task 2024-05-02T16:08:58.091Z] 16:08:58 INFO - PID 869 | 44 XUL 0x000000010b9f6410 _ZN7XREMain11XRE_mainRunEv + 4272 [task 2024-05-02T16:08:58.092Z] 16:08:58 INFO - PID 869 | 45 XUL 0x000000010b9f7b5d _ZN7XREMain8XRE_mainEiPPcRKN7mozilla15BootstrapConfigE + 1949 [task 2024-05-02T16:08:58.093Z] 16:08:58 INFO - PID 869 | 46 XUL 0x000000010b9f883e _Z8XRE_mainiPPcRKN7mozilla15BootstrapConfigE + 142 [task 2024-05-02T16:08:58.093Z] 16:08:58 INFO - PID 869 | 47 firefox 0x00000001010f7c80 main + 1040 [task 2024-05-02T16:08:58.094Z] 16:08:58 INFO - PID 869 | 48 libdyld.dylib 0x00007fff6875dcc9 start + 1 [task 2024-05-02T16:08:58.094Z] 16:08:58 INFO - PID 869 | ) ``` https://treeherder.mozilla.org/logviewer?job_id=456706405&repo=try
Bug 1888279 Comment 10 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
The debug instances of this failure have a backtrace, which seems to indicate that this is/was indeed a gecko bug rather than a harness bug (though still looking unrelated to the features used by this test): ``` [task 2024-05-02T16:08:58.007Z] 16:08:58 INFO - PID 869 | [Parent 869, Main Thread] WARNING: NS_ENSURE_TRUE(uri) failed: file /builds/worker/checkouts/gecko/caps/BasePrincipal.cpp:1494 [task 2024-05-02T16:08:58.041Z] 16:08:58 INFO - PID 869 | 2024-05-02 16:08:58.040 firefox[869:11728] Mozilla has caught an Obj-C exception [NSGenericException: *** Collection <__NSArrayM: 0x129790370> was mutated while being enumerated.] [task 2024-05-02T16:08:58.066Z] 16:08:58 INFO - PID 869 | 2024-05-02 16:08:58.065 firefox[869:11728] Stack trace: [task 2024-05-02T16:08:58.066Z] 16:08:58 INFO - PID 869 | ( [task 2024-05-02T16:08:58.067Z] 16:08:58 INFO - PID 869 | 0 CoreFoundation 0x00007fff2e8d1b57 __exceptionPreprocess + 250 [task 2024-05-02T16:08:58.067Z] 16:08:58 INFO - PID 869 | 1 libobjc.A.dylib 0x00007fff675b55bf objc_exception_throw + 48 [task 2024-05-02T16:08:58.068Z] 16:08:58 INFO - PID 869 | 2 CoreFoundation 0x00007fff2e94a30b __NSFastEnumerationMutationHandler + 159 [task 2024-05-02T16:08:58.068Z] 16:08:58 INFO - PID 869 | 3 XUL 0x0000000109f6a3a5 _ZN13nsCocoaWindow16HideWindowChromeEb + 373 [task 2024-05-02T16:08:58.069Z] 16:08:58 INFO - PID 869 | 4 XUL 0x000000010b344830 _ZN7mozilla9AppWindow22SyncAttributesToWidgetEv + 464 [task 2024-05-02T16:08:58.070Z] 16:08:58 INFO - PID 869 | 5 XUL 0x000000010b34caae _ZThn16_N7mozilla9AppWindow17BeforeStartLayoutEv + 30 [task 2024-05-02T16:08:58.070Z] 16:08:58 INFO - PID 869 | 6 XUL 0x00000001069a1589 _ZN7mozilla3dom8Document17SetMayStartLayoutEb + 169 [task 2024-05-02T16:08:58.071Z] 16:08:58 INFO - PID 869 | 7 XUL 0x00000001094d37db _ZN7mozilla3dom28PrototypeDocumentContentSink11StartLayoutEv + 315 [task 2024-05-02T16:08:58.071Z] 16:08:58 INFO - PID 869 | 8 XUL 0x00000001094d3222 _ZN7mozilla3dom28PrototypeDocumentContentSink11DoneWalkingEv + 242 [task 2024-05-02T16:08:58.072Z] 16:08:58 INFO - PID 869 | 9 XUL 0x00000001094d308f _ZN7mozilla3dom28PrototypeDocumentContentSink16MaybeDoneWalkingEv + 63 [task 2024-05-02T16:08:58.072Z] 16:08:58 INFO - PID 869 | 10 XUL 0x00000001094d239b _ZN7mozilla3dom28PrototypeDocumentContentSink18ResumeWalkInternalEv + 2251 [task 2024-05-02T16:08:58.073Z] 16:08:58 INFO - PID 869 | 11 XUL 0x00000001094d4014 _ZN7mozilla3dom28PrototypeDocumentContentSink23OnScriptCompileCompleteEPN2js8frontend18CompilationStencilE8nsresult + 196 [task 2024-05-02T16:08:58.074Z] 16:08:58 INFO - PID 869 | 12 XUL 0x00000001094d3d4e _ZN7mozilla3dom28PrototypeDocumentContentSink16OnStreamCompleteEP15nsIStreamLoaderP11nsISupports8nsresultjPKh + 718 [task 2024-05-02T16:08:58.074Z] 16:08:58 INFO - PID 869 | 13 XUL 0x00000001055c7f94 _ZN7mozilla3net14nsStreamLoader13OnStopRequestEP10nsIRequest8nsresult + 164 [task 2024-05-02T16:08:58.076Z] 16:08:58 INFO - PID 869 | 14 XUL 0x0000000105f75786 _ZN12nsJARChannel13OnStopRequestEP10nsIRequest8nsresult + 150 [task 2024-05-02T16:08:58.076Z] 16:08:58 INFO - PID 869 | 15 XUL 0x0000000105f7883d _ZThn32_N12nsJARChannel13OnStopRequestEP10nsIRequest8nsresult + 13 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 16 XUL 0x0000000105546780 _ZN17nsInputStreamPump11OnStateStopEv + 832 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 17 XUL 0x00000001055458af _ZN17nsInputStreamPump18OnInputStreamReadyEP19nsIAsyncInputStream + 287 [task 2024-05-02T16:08:58.077Z] 16:08:58 INFO - PID 869 | 18 XUL 0x0000000105546a6d _ZThn24_N17nsInputStreamPump18OnInputStreamReadyEP19nsIAsyncInputStream + 13 [task 2024-05-02T16:08:58.078Z] 16:08:58 INFO - PID 869 | 19 XUL 0x00000001052c6750 _ZZ32NS_NewCancelableRunnableFunctionIZN14CallbackHolderC1EP19nsIAsyncInputStreamP22nsIInputStreamCallbackjP14nsIEventTargetEUlvE_E16already_AddRefedIN7mozilla18CancelableRunnableEEPKcOT_EN22FuncCancelableRunnable3RunEv + 32 [task 2024-05-02T16:08:58.078Z] 16:08:58 INFO - PID 869 | 20 XUL 0x000000010530e4a8 _ZN7mozilla12RunnableTask3RunEv + 24 [task 2024-05-02T16:08:58.079Z] 16:08:58 INFO - PID 869 | 21 XUL 0x00000001053037e6 _ZN7mozilla14TaskController39DoExecuteNextTaskOnlyMainThreadInternalERKNS_6detail12BaseAutoLockIRNS_5MutexEEE + 1990 [task 2024-05-02T16:08:58.080Z] 16:08:58 INFO - PID 869 | 22 XUL 0x00000001053021c9 _ZN7mozilla14TaskController37ExecuteNextTaskOnlyMainThreadInternalERKNS_6detail12BaseAutoLockIRNS_5MutexEEE + 89 [task 2024-05-02T16:08:58.080Z] 16:08:58 INFO - PID 869 | 23 XUL 0x00000001053026a7 _ZN7mozilla14TaskController20ProcessPendingMTTaskEb + 103 [task 2024-05-02T16:08:58.081Z] 16:08:58 INFO - PID 869 | 24 XUL 0x0000000105313787 _ZN7mozilla6detail16RunnableFunctionIZNS_14TaskControllerC1EvE3$_0E3RunEv + 23 [task 2024-05-02T16:08:58.081Z] 16:08:58 INFO - PID 869 | 25 XUL 0x0000000105328e98 _ZN8nsThread16ProcessNextEventEbPb + 1912 [task 2024-05-02T16:08:58.082Z] 16:08:58 INFO - PID 869 | 26 XUL 0x000000010532530c _Z23NS_ProcessPendingEventsP9nsIThreadj + 172 [task 2024-05-02T16:08:58.082Z] 16:08:58 INFO - PID 869 | 27 XUL 0x0000000109eced62 _ZN14nsBaseAppShell19NativeEventCallbackEv + 114 [task 2024-05-02T16:08:58.083Z] 16:08:58 INFO - PID 869 | 28 XUL 0x0000000109f5cda0 _ZN10nsAppShell18ProcessGeckoEventsEPv + 304 [task 2024-05-02T16:08:58.083Z] 16:08:58 INFO - PID 869 | 29 CoreFoundation 0x00007fff2e855d52 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 [task 2024-05-02T16:08:58.084Z] 16:08:58 INFO - PID 869 | 30 CoreFoundation 0x00007fff2e855cf1 __CFRunLoopDoSource0 + 103 [task 2024-05-02T16:08:58.085Z] 16:08:58 INFO - PID 869 | 31 CoreFoundation 0x00007fff2e855b0b __CFRunLoopDoSources0 + 209 [task 2024-05-02T16:08:58.085Z] 16:08:58 INFO - PID 869 | 32 CoreFoundation 0x00007fff2e85483a __CFRunLoopRun + 927 [task 2024-05-02T16:08:58.086Z] 16:08:58 INFO - PID 869 | 33 CoreFoundation 0x00007fff2e853e3e CFRunLoopRunSpecific + 462 [task 2024-05-02T16:08:58.086Z] 16:08:58 INFO - PID 869 | 34 HIToolbox 0x00007fff2d480abd RunCurrentEventLoopInMode + 292 [task 2024-05-02T16:08:58.087Z] 16:08:58 INFO - PID 869 | 35 HIToolbox 0x00007fff2d4807d5 ReceiveNextEventCommon + 584 [task 2024-05-02T16:08:58.087Z] 16:08:58 INFO - PID 869 | 36 HIToolbox 0x00007fff2d480579 _BlockUntilNextEventMatchingListInModeWithFilter + 64 [task 2024-05-02T16:08:58.088Z] 16:08:58 INFO - PID 869 | 37 AppKit 0x00007fff2bac6039 _DPSNextEvent + 883 [task 2024-05-02T16:08:58.088Z] 16:08:58 INFO - PID 869 | 38 AppKit 0x00007fff2bac4880 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1352 [task 2024-05-02T16:08:58.089Z] 16:08:58 INFO - PID 869 | 39 XUL 0x0000000109f5c0bf -[GeckoNSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 175 [task 2024-05-02T16:08:58.089Z] 16:08:58 INFO - PID 869 | 40 AppKit 0x00007fff2bab658e -[NSApplication run] + 658 [task 2024-05-02T16:08:58.090Z] 16:08:58 INFO - PID 869 | 41 XUL 0x0000000109f5bed0 -[GeckoNSApplication run] + 64 [task 2024-05-02T16:08:58.090Z] 16:08:58 INFO - PID 869 | 42 XUL 0x0000000109f5d580 _ZN10nsAppShell3RunEv + 576 [task 2024-05-02T16:08:58.091Z] 16:08:58 INFO - PID 869 | 43 XUL 0x000000010b875a8c _ZN12nsAppStartup3RunEv + 108 [task 2024-05-02T16:08:58.091Z] 16:08:58 INFO - PID 869 | 44 XUL 0x000000010b9f6410 _ZN7XREMain11XRE_mainRunEv + 4272 [task 2024-05-02T16:08:58.092Z] 16:08:58 INFO - PID 869 | 45 XUL 0x000000010b9f7b5d _ZN7XREMain8XRE_mainEiPPcRKN7mozilla15BootstrapConfigE + 1949 [task 2024-05-02T16:08:58.093Z] 16:08:58 INFO - PID 869 | 46 XUL 0x000000010b9f883e _Z8XRE_mainiPPcRKN7mozilla15BootstrapConfigE + 142 [task 2024-05-02T16:08:58.093Z] 16:08:58 INFO - PID 869 | 47 firefox 0x00000001010f7c80 main + 1040 [task 2024-05-02T16:08:58.094Z] 16:08:58 INFO - PID 869 | 48 libdyld.dylib 0x00007fff6875dcc9 start + 1 [task 2024-05-02T16:08:58.094Z] 16:08:58 INFO - PID 869 | ) ``` https://treeherder.mozilla.org/logviewer?job_id=456706405&repo=try