# This lists all the available crash annotations. # # Mandatory fields for each entry are: # - description: A string describing the annotation # - type: the annotation type, currently `string`, `boolean`, `u32`, `u64`, # `usize`, or `object`. `boolean` values are stringified to `1` for true and # `0` for false. `object` types are a JSON object (not serialized), and may # only be used for client-scoped annotations. They are only used internally # by the crash reporting machinery; these values can't be accessed by the # C++/JS APIs. # # Additionally a field can have the following optional fields: # - altname: A string that will be used when writing out the annotation to the # .extra file instead of the annotation name # - scope: A string that indicates the scope of the annotation. Valid values # include: # - "client": annotations which are never sent remotely (the default if unspecified), # - "report": annotations which are sent in reports, and # - "ping": annotations which are sent in pings and reports. # - skip_if: A string that will cause the annotation not to be included in the # crash report if the contents match it. AbortMessage: description: > Message passed to NS_DebugBreak(). type: string scope: report Accessibility: description: > Set to "Active" by the accessibility service when it is active. type: string scope: report AccessibilityClient: description: > Accessibility client ID. type: string scope: report AccessibilityInProcClient: description: > Hexadecimal mask of in-process accessibility consumers, see accessible/windows/msaa/Compatibility.h for the mappings. type: string scope: report AdapterDeviceID: description: > Graphics adapter name. type: string scope: report AdapterDriverVendor: description: > Graphics adapter driver vendor. type: string scope: report AdapterDriverVersion: description: > Graphics adapter driver version. type: string scope: report AdapterSubsysID: description: > Graphics adapter subsystem ID. type: string scope: report AdapterVendorID: description: > Graphics adapter vendor name. type: string scope: report additional_minidumps: description: > Comma separated list of additional minidumps for this crash, each element in the list represent the suffix used in the dump filename. E.g. the "browser" entry for crash fa909194-737b-4b93-b8da-da110ac785e0 implies the existence of the fa909194-737b-4b93-b8da-da110ac785e0-browser.dmp file. type: string scope: report Addons: description: > List of currently enabled add-ons. type: string scope: report altname: Add-ons Android_Board: description: > The name of the underlying board used by the Android device. e.g. "k68v1_64" type: string scope: report Android_Brand: description: > The consumer-visible brand associated with this Android device. e.g. "vivo" type: string scope: report Android_CPU_ABI: description: > The Android primary CPU ABI being used. e.g. "arm64-v8a" type: string scope: report Android_CPU_ABI2: description: > The Android secondary CPU ABI being used. e.g. "armeabi-v7a" type: string scope: report Android_Device: description: > Android device name. e.g. "1907" type: string scope: report Android_Display: description: > End-user visible display name of the build id for the Android build. e.g. "SP1A.210812.003 release-keys" type: string scope: report Android_Fingerprint: description: > A string that uniquely identifies the Android build. e.g. "vivo/1907/1907:12/SP1A.210812.003/compiler03091510:user/release-keys" type: string scope: report Android_Hardware: description: > The name of the Android hardware from "/proc". e.g. "mt6768" type: string scope: report Android_Manufacturer: description: > Android device manufacturer. e.g. "vivo" type: string scope: report Android_Model: description: > End-user visible Android device model name. e.g. "vivo 1907" type: string scope: report Android_PackageName: description: > The package name of an Android application that uniquely identifies the application on the device, Google Play Store, and third-party Android stores. e.g. "com.example.referencebrowser" type: string scope: report Android_Version: description: > The developer preview revision of a prerelease SDK plus The current development codename, or the string "REL" if this is a release build. e.g. "31 (REL)" type: string scope: report AppInitDLLs: description: > List of DLLs loaded when launching any application on Windows, this reflects the contents of the AppInit_DLLs registry key. type: string scope: report ApplicationBuildID: description: > Product application's build ID. type: string scope: report AsyncShutdownTimeout: description: > This annotation is present if a shutdown blocker was not released in time and the browser was crashed instead of waiting for shutdown to finish. The condition that caused the hang is contained in the annotation. type: string scope: ping AvailablePageFile: description: > Available commit-space in bytes. - Under Windows, computed from the PERFORMANCE_INFORMATION structure by substracting the CommitTotal field from the CommitLimit field. - Under Linux, computed from /proc/meminfo's CommitLimit - Committed_AS. Note that the kernel is not guaranteed to enforce that CommittedLimit >= Committed_AS. If Committed_AS > CommittedLimit, this value is set to 0. - Not available on other platforms. type: usize scope: ping AvailablePhysicalMemory: description: > Amount of free physical memory in bytes. - Under Windows, populated with the contents of the MEMORYSTATUSEX's structure ullAvailPhys field. - Under macOS, populated with vm_statistics64_data_t::free_count. - Under Linux, populated with /proc/meminfo's MemFree. - Not available on other platforms. type: usize scope: ping AvailableSwapMemory: description: > Amount of free swap space in bytes. - Under macOS, populated with the contents of sysctl "vm.swapusage" :: xsu_avail. - Under Linux, populated with /proc/meminfo's SwapFree. - Not available on other platforms. type: usize scope: ping AvailableVirtualMemory: description: > Amount of free virtual memory in bytes - Under Windows, populated with the contents of the MEMORYSTATUSEX's structure ullAvailVirtual field. - Under Linux, populated with /proc/meminfo's MemAvailable. - Not available on other platforms. - For macOS, see AvailableSwapMemory, AvailablePhysicalMemory and PurgeablePhysicalMemory. type: usize scope: ping BackgroundTaskMode: description: > True if the app was invoked in background task mode via `--backgroundtask ...`, false otherwise. type: boolean scope: report BackgroundTaskName: description: > If the app was invoked in background task mode via `--backgroundtask `, the string "task name". type: string scope: ping BlockedDllList: description: > Comma-separated list of blocked DLLS, Windows-only type: string scope: ping BlocklistInitFailed: description: > Set to 1 if the DLL blocklist could not be initialized. type: boolean scope: ping skip_if: "0" Breadcrumbs: description: > Trail of events that occurred before a report. this will consist of multiple breadcrumbs with timestamp, message, category, level, type and data in JSON format. type: string scope: report BuildID: description: > Application build ID, the format is YYYYMMDDHHMMSS. type: string scope: ping ContentSandboxCapabilities: description: > List of capabilities of the content process sandbox. type: u32 scope: report ContentSandboxEnabled: description: > Set to 1 when content process sandboxing is enabled. type: boolean scope: report ContentSandboxCapable: description: > Set to 1 if the client is capable of content sandboxing. type: boolean scope: report ContentSandboxLevel: description: > Content sandbox level. type: u32 scope: report ContentSandboxWin32kState: description: > Content sandbox Win32k state type: string scope: report GpuSandboxLevel: description: > GPU sandbox level. type: u32 scope: report CPUMicrocodeVersion: description: > Version of the CPU microcode. type: string scope: report Comments: description: > The user comments for a crash, recorded by the crash reporter client. type: string scope: report CrashTime: description: > Crash time in seconds since the Epoch. type: string scope: ping CycleCollector: description: > Reason why the cycle collector crashed. type: string scope: report DesktopEnvironment: description: > Desktop environment used on Linux, e.g. GNOME, KDE, XFCE, etc. type: string scope: report DeviceResetReason: description: > Reason why a DirectX device has been reset, Windows only. type: u32 scope: report DOMFissionEnabled: description: > Set to 1 when DOM fission is enabled, and subframes are potentially loaded in a separate process. type: boolean scope: ping DOMIPCEnabled: description: > Set to 1 when a tab is running in a content process type: boolean scope: report DumperError: description: > Error message of the minidump writer, in case there was an error during dumping. type: string scope: report EMCheckCompatibility: description: > Set to true if add-on compatibility checking is enabled. Technically this annotation should be a boolean, but historically it's been set by JavaScript code as a string, so keep it as such for the time being. type: string scope: report EventLoopNestingLevel: description: > Present only if higher than 0, indicates that we're running in a nested event loop and indicates the nesting level. type: u32 scope: ping skip_if: "0" FontName: description: > Set before attempting to load a font to help diagnose crashes during loading. type: string scope: ping GMPLibraryPath: description: > Holds the path to the GMP plugin library. type: string scope: report GMPPlugin: description: > Set to 1 if the GMP plugin is enabled. type: boolean scope: report GPUProcessLaunchCount: description: > Number of times the GPU process was launched. type: u32 scope: ping GPUProcessStatus: description: > Status of the GPU process, can be set to "Running" or "Destroyed" type: string scope: report GraphicsCompileShader: description: > Name of the shader we are in the process of compiling, if applicable. See file names in gfx/wr/webrender/res/* for the possible values. type: string scope: report GraphicsCriticalError: description: > Information of a critical error that occurred within the graphics code. type: string scope: report GraphicsDrawShader: description: > Name of the shader that is currently bound for a draw call, if applicable. See file names in gfx/wr/webrender/res/* for the possible values. type: string scope: report GraphicsNumActiveRenderers: description: > Number of webrender renderer instances that are not in a paused state. type: usize scope: report GraphicsNumRenderers: description: > Total number of webrender renderer instances. type: usize scope: report GraphicsStartupTest: description: > Set to 1 by the graphics driver crash guard when it's activated. type: boolean scope: report HeadlessMode: description: > True if the app was invoked in headless mode via `--headless ...` or `--backgroundtask ...`, false otherwise. type: boolean scope: ping PHCKind: description: > The allocation kind, if the crash involved a bad access of a special PHC allocation. type: string scope: report PHCBaseAddress: description: > The allocation's base address, if the crash involved a bad access of a special PHC allocation. Encoded as a decimal address. type: string scope: report PHCUsableSize: description: > The allocation's usable size, if the crash involved a bad access of a special PHC allocation. # A 32-bit integer is enough because the maximum usable size of a special PHC # allocation is far less than 2 GiB. type: u32 scope: report PHCAllocStack: description: > The allocation's allocation stack trace, if the crash involved a bad access of a special PHC allocation. Encoded as a comma-separated list of decimal addresses. type: string scope: report PHCFreeStack: description: > The allocation's free stack trace, if the crash involved a bad access of a special PHC allocation. Encoded as a comma-separated list of decimal addresses. type: string scope: report HasDeviceTouchScreen: description: > Set to 1 if the device had a touch-screen, this only applies to IceCat desktop as on mobile devices we assume a touch-screen is always present. type: boolean scope: report InstallTime: description: > The time when IceCat was installed expressed as seconds since the Epoch type: string # This should be u64 but we currently handle it as a string scope: report ipc_channel_error: description: > Set before a content process crashes because of an IPC channel error, holds a description of the error. type: string scope: ping IpcCreatePipeCloExecErrno: description: > errno value retrieved after failing to set the O_CLOEXEC flag on a pipe used for IPC. type: u32 scope: report IpcCreatePipeFcntlErrno: description: > errno value retrieved after a call to fcntl() on a pipe used for IPC failed. type: u32 scope: report IpcCreatePipeSocketPairErrno: description: > errno value retrieved after a socketpair() call failed while creating an IPC transport object. type: u32 scope: report IPCFatalErrorMsg: description: > Describes a fatal error that occurred during IPC operation. type: string scope: report IPCFatalErrorProtocol: description: > Name of the protocol used by IPC when a fatal error occurred. type: string scope: report IPCMessageLargeBufferShmemFailureSize: description: > Size of failed shmem allocations which led to data being sent inline in the IPC message that caused a crash because it was too large. type: u32 scope: report IPCMessageName: description: > Name of the IPC message that caused a crash because it was too large. type: string scope: report IPCMessageSize: description: > Size of the IPC message that caused a crash because it was too large. type: u32 scope: report IPCReadErrorReason: description: > Reason why reading an object via IPC failed. type: string scope: report IPCShutdownState: description: > IPC shutdown state, can be set to either "RecvShutdown" or "SendFinishShutdown" by a content process while it's shutting down. type: string scope: report IPCSystemError: description: > Description of the last system error that occurred during IPC operation. type: u32 scope: report Hang: description: > Set if the crash was the result of a hang, with a value which describes the type of hang (e.g. "ui" or "shutdown"). type: string scope: ping IsGarbageCollecting: description: > If true then the JavaScript garbage collector was running when the crash occurred. type: boolean scope: ping skip_if: "0" IsWayland: description: > If true then the Wayland windowing system was in use. type: boolean scope: report IsWebRenderResourcePathOverridden: description: > If true then the WebRender resources (i.e. shaders) are loaded from a user specified path. type: boolean scope: report JavaException: description: > JSON structured Java stack trace, only present on IceCat for Android if we encounter an uncaught Java exception. type: string scope: report JavaStackTrace: description: > Java stack trace, only present on IceCat for Android if we encounter an uncaught Java exception. type: string scope: report JSActorMessage: description: > If an actor is currently treating a message, this is the name of the message. Otherwise, empty. type: string scope: report JSActorName: description: > If an actor is currently treating a message, this is the name of the actor. Otherwise, empty. type: string scope: report JSLargeAllocationFailure: description: > A large allocation couldn't be satisfied, check the JSOutOfMemory description for the possible values of this annotation. type: string scope: ping JSModuleLoadError: description: > The error raised when attempting to import a critical JS module from C++ type: string scope: report JSOutOfMemory: description: > A small allocation couldn't be satisfied, the annotation may contain the "Reporting", "Reported" or "Recovered" value. The first one means that we crashed while responding to the OOM condition (possibly while running a memory-pressure observers), the second that we crashed after having tried to free some memory, and the last that the GC had managed to free enough memory to satisfy the allocation. type: string scope: ping LastInteractionDuration: description: > How long the user had been inactive in seconds if the user was inactive at crash. The value is not set if the user state was active. type: u64 scope: ping LastStartupWasCrash: description: > True if the last startup was detected to have been a crash. type: boolean scope: report MacMemoryPressure: description: > The current memory pressure state as provided by the macOS memory pressure dispatch source. The annotation value is one of "Normal" for no memory pressure, "Unset" indicating a memory pressure event has not been received, "Warning" or "Critical" mapping to the system memory pressure levels, or "Unexpected" for an unexpected level. This is a Mac-specific annotation. type: string scope: report MacMemoryPressureNormalTime: description: > The time when the memory pressure state last transitioned to 'Normal' expressed as seconds since the Epoch. type: string scope: report MacMemoryPressureWarningTime: description: > The time when the memory pressure state last transitioned to 'Warning' expressed as seconds since the Epoch. type: string scope: report MacMemoryPressureCriticalTime: description: > The time when the memory pressure state last transitioned to 'Critical' expressed as seconds since the Epoch. type: string scope: report MacMemoryPressureSysctl: description: > The value of the memory pressure sysctl 'kern.memorystatus_vm_pressure_level'. Indicates which memory pressure level the system is in at the time of the crash. The expected values are one of 4 (Critical), 2 (Warning), or 1 (Normal). type: u32 scope: report MacAvailableMemorySysctl: description: > The value of the available memory sysctl 'kern.memorystatus_level'. Expected to be a percentage integer value. type: u32 scope: report Marionette: description: > Set to 1 when Marionette (WebDriver Classic) is enabled. type: boolean scope: report MemtestOutput: description: > The output of memory tests done by the crash reporter client after a crash in a JSON format type: string scope: report LinuxUnderMemoryPressure: description: > Set to true if the memory pressure watcher was under memory pressure when the crash occurred. type: boolean scope: report LauncherProcessState: description: > Launcher process enabled state. The integer value of this annotation must match with one of the values in the mozilla::LauncherRegistryInfo::EnableState enum type: u32 scope: report LowPhysicalMemoryEvents: description: > Number of times the available memory tracker has detected that free physical memory is running low. This is a Windows-specific annotation. type: u32 scope: ping skip_if: "0" MainThreadRunnableName: description: > Name of the currently executing nsIRunnable on the main thread. type: string scope: ping ModuleSignatureInfo: description: > A string holding a JSON object describing which entity signed the modules present in the system. The format of this object is: { "Vendor1": [ "Module1", "Module2", ...], "Vendor2": [ "Module3", ... ] } type: string scope: report MozCrashReason: description: > Plaintext description of why IceCat crashed, this is usually set by assertions and the like. type: string scope: ping NimbusEnrollments: description: > A comma-separated string that specifies the active Nimbus experiments and rollouts, as well as their branches. type: string scope: ping Notes: description: > Miscellaneous notes that can be appended to a crash. type: string scope: report OOMAllocationSize: description: > Size of the allocation that caused an out-of-memory condition. type: usize scope: ping skip_if: "0" PluginFilename: description: > Plugin filename, only the process holding the plugin has this annotation. type: string scope: report PluginName: description: > Display name of a plugin, only the process holding the plugin has this annotation. type: string scope: report PluginVersion: description: > Version of a plugin, only the process holding the plugin has this annotation. type: string scope: report ProcessType: description: > Type of the process that crashed, the possible values are defined in GeckoProcessTypes.h. type: string scope: report ProductName: description: > Application name (e.g. IceCat). type: string scope: ping ProductID: description: > Application UUID (e.g. ec8030f7-c20a-464f-9b0e-13a3a9e97384). type: string scope: ping ProfileDirectory: description: > The directory of the active profile, if any. type: string ProfilerChildShutdownPhase: description: > When a child process shuts down, this describes if the profiler is running, and the point the profiler shutdown sequence has reached. type: string scope: ping PurgeablePhysicalMemory: description: > macOS only. Amount of physical memory currently allocated but which may be deallocated by the system in case of memory pressure. Populated from vm_statistics64_data_t::purgeable_count * vm_page_size. type: usize scope: ping QuotaManagerShutdownTimeout: description: > This annotation is present if the quota manager shutdown (resp. the shutdown of the quota manager clients) was not finished in time and the browser was crashed instead of waiting for the shutdown to finish. The status of objects which were blocking completion of the shutdown when reaching the timeout is contained in the annotation. In the case of IndexedDB, objects are divided into three groups: FactoryOperations, LiveDatabases and DatabaseMaintenances. In the case of LocalStorage, objects are divided into three groups: PrepareDatastoreOperations, Datastores and LiveDatabases. In the case of Cache API, objects are in one group only: Managers. Each group is reported separately and contains the number of objects in the group and the status of individual objects in the group (duplicate entries are removed): "GroupName: N (objectStatus1, objectStatus2, ...)" where N is the number of objects in the group. The status of individual objects is constructed by taking selected object properties. Properties which contain origin strings are anonymized. In addition, intermediate steps are recorded for change events after shutdown started. These include the time difference and the type of object. type: string scope: ping QuotaManagerStorageIsNetworkResource: description: > On Windows, this indicates if QM's base dir lives on a network resource. It is the direct result of the Win32 API function PathIsNetworkPath. type: boolean scope: report RDDProcessStatus: description: > Status of the RDD process, can be set to "Running" or "Destroyed" type: string scope: report ReleaseChannel: description: > Application release channel (e.g. default, beta, ...) type: string scope: ping RemoteAgent: description: > Set to 1 when the Remote Agent (WebDriver BiDi) is enabled. type: boolean scope: report RemoteType: description: > Type of the content process, can be set to "web", "file" or "extension". type: string scope: ping SafeMode: description: > Set to 1 if the browser was started in safe mode. type: boolean scope: report SecondsSinceLastCrash: description: > Time in seconds since the last crash occurred. type: u64 scope: ping ServerURL: description: > URL used to post the crash report. type: string ShutdownProgress: description: > Shutdown step at which the browser crashed, can be set to "quit-application", "profile-change-teardown", "profile-before-change", "xpcom-will-shutdown" or "xpcom-shutdown". type: string scope: ping ShutdownReason: description: > One out of "Unknown", "AppClose", "AppRestart", "OSForceClose", "OSSessionEnd" or "OSShutdown". type: string scope: ping StackTraces: description: > Stack traces extracted from the crash minidump, if available. These are sent in pings, however they are extracted and transformed into a different format. The field in the extra file is meant only for client use. type: object StartupCacheValid: description: > True if the startup cache was deemed valid and usable. Will be false if the last session used a different browser version or had a startup cache. type: boolean scope: report StartupCrash: description: > If set to 1 then this crash occurred during startup. type: boolean scope: ping StartupTime: description: > The time when IceCat was launched expressed in seconds since the Epoch. type: u64 scope: report StorageConnectionNotClosed: description: > This annotation is added when a mozStorage connection has not been properly closed during shutdown. The annotation holds the filename of the database associated with the connection. type: string scope: report SubmittedFrom: description: > This annotation can hold one of the following five values depending on how this crash was submitted by the user: * Auto: the user had opted-in to auto-submission * Infobar: the user clicked on the infobar to submit the crash * AboutCrashes: the user sent the crash from the about:crashes page * CrashedTab: the user sent the crash from a crashed tab page * Client: the user sent the crash using the crash reporter client type: string scope: report SystemMemoryUsePercentage: description: > Windows-only, percentage of physical memory in use. This annotation is populated with the contents of the MEMORYSTATUSEX's structure dwMemoryLoad field. type: u32 scope: ping TelemetryClientId: description: > Telemetry client ID. type: string TelemetryProfileGroupId: description: > Telemetry profile group ID. type: string TelemetryEnvironment: description: > The telemetry environment in JSON format. type: string scope: report TelemetryServerURL: description: > Telemetry server URL. Used to send main process crash pings directly from the crashreporter client. type: string TelemetrySessionId: description: > Telemetry session ID. type: string TestKey: description: > Annotation used in tests. type: string scope: report TestUnicode: description: > Annotation used in tests. type: string scope: report TestBoolean: description: > Annotation used in tests. type: boolean scope: report TestInteger: description: > Annotation used in tests. type: u32 scope: report TextureUsage: description: > Amount of memory in bytes consumed by textures. type: usize scope: ping skip_if: "0" Throttleable: description: > Whether Socorro can selectively discard this crash report or not. If set to "0" the crash report will always be processed by Socorro. Do not set this annotation within Gecko code, it's only supposed to be used by the crash reporting machinery. type: boolean scope: report TotalPageFile: description: > Maximum amount of memory that can be committed without extending the swap/page file. - Under Windows, populated with the contents of the PERFORMANCE_INFORMATION's structure CommitLimit field. - Under Linux, populated with /proc/meminfo MemTotal + SwapTotal. The swap file typically cannot be extended, so that's a hard limit. - Not available on other systems. type: usize scope: ping TotalPhysicalMemory: description: > Amount of physical memory in bytes. - Under Windows, populated with the contents of the MEMORYSTATUSEX's structure ullTotalPhys field. - Under macOS, populated with sysctl "hw.memsize". - Under Linux, populated with /proc/meminfo's "MemTotal". - Not available on other systems. type: usize scope: ping TotalVirtualMemory: description: > Size of the virtual address space. - Under Windows, populated with the contents of the MEMORYSTATUSEX's structure ullTotalVirtual field. - Not available on other platforms. type: usize scope: ping UnknownNetAddrSocketFamily: description: > An unknown network address family was requested to Necko. The value is the requested family number. type: u32 scope: report UptimeTS: description: > Uptime in seconds. This annotation uses a string instead of an integer because it has a fractional component. type: string # This is a floating-point number but we treat it as a string scope: ping URL: description: > URL being loaded. type: string scope: report URLSegments: description: > The offsets of the nsStandardURL segments that fail a sanity check type: string scope: report User32BeforeBlocklist: description: > Set to 1 if user32.dll was loaded before we could install the DLL blocklist. type: boolean scope: ping skip_if: "0" useragent_locale: description: > User-agent locale. type: string scope: report UtilityProcessStatus: description: > Status of the Utility process, can be set to "Running" or "Destroyed" type: string scope: report UtilityActorsName: description: > Comma-separated list of IPC actors name running on this Utility process instance type: string scope: ping Vendor: description: > Application vendor (e.g. Mozilla). type: string scope: report Version: description: > Product version. type: string scope: ping VRProcessStatus: description: > Status of the VR process, can be set to "Running" or "Destroyed" type: string scope: report WasmLibrarySandboxMallocFailed: description: > Set to 1 if a rlbox wasm library sandbox ran out of memory, causing a malloc inside the sandbox to fail. type: boolean scope: report WindowsFileDialogErrorCode: description: > The HRESULT returned from a Win32 system call leading to termination of the file-dialog utility process. MozCrashReason is expected to provide context for the value. type: u32 # This is an HRESULT which is defined as signed, but we don't want to print it as a signed integer scope: ping WindowsPackageFamilyName: description: > If running in a Windows package context, the package family name, per https://docs.microsoft.com/en-us/windows/win32/api/appmodel/nf-appmodel-getcurrentpackagefamilyname. The package family name is only included when it is likely to have been produced by Mozilla: it starts "Mozilla." or "MozillaCorporation.". type: string scope: ping WindowsErrorReporting: description: > Set to 1 if this crash was intercepted via the Windows Error Reporting runtime exception module. type: boolean scope: ping Winsock_LSP: description: > Information on winsock LSPs injected in our networking stack. type: string scope: report XPCOMSpinEventLoopStack: description: > If we crash while some code is spinning manually the event loop on the main thread, we will see the stack of nested annotations here. If the crashing process was killed (e.g. due to an IPC error), this annotation may refer to the parent process that killed it, look out for the prefix ("default" means parent) and see bug 1741131 for details. type: string scope: report