We are encountering a critical, intermittently occurring crash issue when accessing photo data using PHAssetResourceManager.writeDataForAssetResource on iOS 18. The problem does not arise on iOS 17 or earlier versions. We have been unable to identify a consistent reproduction path. Based on user feedback, the issue seems to involve Live Photo and Raw image files. Our investigation has revealed that the crash occurs in the +[PISchema identifier] method of the PhotoImaging Framework. When called manually, this method causes a crash on iOS 18 but works without issues on iOS 17. Reproduction Steps: 1.Fetch PHAsset. 2.Get PHAssetResource by [PHAssetResource assetResourcesForAsset:]. 3.Call [PHAssetResourceManager writeDataForAssetResource:toFile:options:completionHandler:]. Crash Log: Incident Identifier: CFD60092-FDB1-43B4-BA42-3F507F7B8B96 CrashReporter Key: 260b4780989083a54e0cb451930fe9a3bed64862 Hardware Model: iPhone13,4 AppStoreTools: 16C5031b AppVariant: 1:iPhone13,4:18 Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd [1] Date/Time: 2025-02-15 19:07:57.7054 +0800 Launch Time: 2025-02-15 19:07:55.4106 +0800 OS Version: iPhone OS 18.3.1 (22D72) Release Type: User Baseband Version: 5.20.03 Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Termination Reason: SIGNAL 6 Abort trap: 6 Terminating Process: mCloud_iPhone [11109] Triggered by Thread: 11 Application Specific Information: abort() called Thread 11 name: Dispatch queue: com.apple.NSXPCConnection.m-user.com.apple.photos.service Thread 11 Crashed: 0 libsystem_kernel.dylib 0x1e850b2d4 __pthread_kill + 8 1 libsystem_pthread.dylib 0x221b4959c pthread_kill + 268 2 libsystem_c.dylib 0x19ec24b08 abort + 128 3 NeutrinoCore 0x1bdcdbdec -[NUAssertionPolicyAbort notifyAssertion:] + 68 4 NeutrinoCore 0x1bdcdbbf4 -[NUAssertionPolicyComposite notifyAssertion:] + 160 5 NeutrinoCore 0x1bdcdc098 -[NUAssertionPolicyUnique notifyAssertion:] + 176 6 NeutrinoCore 0x1bdcdb524 -[NUAssertionHandler handleFailureInFunction:file:lineNumber:currentlyExecutingJobName:description:arguments:] + 156 7 NeutrinoCore 0x1bdcdc4bc _NUAssertFailHandler + 176 8 NeutrinoCore 0x1bdc8ea98 -[NUIdentifier initWithNamespace:name:version:] + 2352 9 NeutrinoCore 0x1bdc8eba8 -[NUIdentifier initWithName:version:] + 84 10 NeutrinoCore 0x1bdc8ec10 -[NUIdentifier initWithName:] + 68 11 PhotoImaging 0x1bda54ce4 +[PISchema identifier] + 36 12 PhotoImaging 0x1bda550fc +[PISchema registeredPhotosSchemaIdentifier] + 32 13 PhotoImaging 0x1bd9d7128 +[PIPhotoEditHelper newComposition] + 28 14 PhotoImaging 0x1bd940798 +[PICompositionSerializer deserializeCompositionFromAdjustments:metadata:formatIdentifier:formatVersion:sidecarData:error:] + 160 15 PhotoImaging 0x1bd9412ec +[PICompositionSerializer deserializeCompositionFromData:formatIdentifier:formatVersion:sidecarData:error:] + 224 16 PhotoLibraryServices 0x1afabf75c -[PLPhotoEditPersistenceManager loadCompositionFrom:formatIdentifier:formatVersion:sidecarData:error:] + 1856 17 PhotoLibraryServices 0x1afabffe4 +[PLPhotoEditPersistenceManager validateAdjustmentData:formatIdentifier:formatVersion:error:] + 108 18 Photos 0x1af4ac360 __167+[PHContentEditingInputRequestContext contentEditingInputRequestContextForAsset:requestID:managerID:networkAccessAllowed:downloadIntent:progressHandler:resultHandler:]_block_invoke + 260 19 Photos 0x1af4ac67c -[PHAdjustmentData(ContentEditingInput) _contentEditing_readableByClientWithVerificationBlock:] + 136 20 Photos 0x1af4ac4b0 -[PHAdjustmentData(ContentEditingInput) _contentEditing_requiredBaseVersionReadableByClient:verificationBlock:] + 88 21 Photos 0x1af4abb8c -[PHContentEditingInputRequestContext _adjustmentBaseVersionFromResult:request:canHandleAdjustmentData:] + 404 22 Photos 0x1af4a911c -[PHContentEditingInputRequestContext produceChildRequestsForRequest:reportingIsLocallyAvailable:isDegraded:result:] + 624 23 Photos 0x1af2c1d10 -[PHMediaRequestContext _produceChildRequestsForRequest:withResult:] + 88 24 Photos 0x1af2c11e8 -[PHMediaRequestContext mediaRequest:didFinishWithResult:] + 88 25 Photos 0x1af505184 -[PHAdjustmentDataRequest _finishFromAsynchronousCallback] + 124 26 Photos 0x1af5050a0 __39-[PHAdjustmentDataRequest startRequest]_block_invoke + 584 27 PhotoLibraryServicesCore 0x1b001be8c __106-[PLAssetsdResourceClient adjustmentDataForAsset:networkAccessAllowed:trackCPLDownload:completionHandler:]_block_invoke.86 + 864 28 CoreFoundation 0x196dd8e34 __invoking___ + 148 29 CoreFoundation 0x196dd7e7c -[NSInvocation invoke] + 428 30 Foundation 0x195a64ae0 __NSXPCCONNECTION_IS_CALLING_OUT_TO_EXPORTED_OBJECT__ + 16 31 Foundation 0x195a63514 -[NSXPCConnection _decodeAndInvokeReplyBlockWithEvent:sequence:replyInfo:] + 532 32 Foundation 0x195a6653c __88-[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:]_block_invoke_5 + 188 33 libxpc.dylib 0x221babb80 _xpc_connection_reply_callout + 116 34 libxpc.dylib 0x221b9e2d0 _xpc_connection_call_reply_async + 80 35 libdispatch.dylib 0x19eb6b028 _dispatch_client_callout3 + 20 36 libdispatch.dylib 0x19eb88b64 _dispatch_mach_msg_async_reply_invoke + 340 37 libdispatch.dylib 0x19eb7242c _dispatch_lane_serial_drain + 352 38 libdispatch.dylib 0x19eb73158 _dispatch_lane_invoke + 432 39 libdispatch.dylib 0x19eb7e38c _dispatch_root_queue_drain_deferred_wlh + 288 40 libdispatch.dylib 0x19eb7dbd8 _dispatch_workloop_worker_thread + 540 41 libsystem_pthread.dylib 0x221b44680 _pthread_wqthread + 288 42 libsystem_pthread.dylib 0x221b42474 start_wqthread + 8