Update: iOS 15 RC still has this problem. With same data, simulator works fine, while device failed. Memory issue caused by long string or something else?

it is not fixed on iPadOS/iOS 15.1 beta. 🥲🥲 A TSI is requested.

Sorry for the late. Sample is uploaded. FB9659774. I known little about instrument, if anything is missing, please tell me. iOS 15.2 beta

It's not solved yet. iOS 15.3 beta.

Memory issue seems fixed in iOS 15.5 for me, NSAllocateMemoryPages failed disappears, memory usage < 600M, but syncing with large data broken on some device. 200MB Sqlite + 70GB assets M1 Max macOS Catalyst(sync success) ==> 3-5 hours(most time for download) + low cpu usage iPad Pro 12.9 5th 16g RAM(sync success) ==> 20 hours active + 5 crashes + half time 100% CPU iPhone Xs  Max(sync failed) ==> 40+ hours syncing with 15gb downloaded + 10 crashes and sync errors + half time 100% CPU