Summary
Starting an AR Session with UE5.7 on IOS26 crashes with.
[UE] Fatal error: [File:./Runtime/Core/Private/HAL/MallocBinned2.cpp] [Line: 900]
FMallocBinned2 Attempt to realloc an unrecognized block 0x121cb0000 canary == 0x0 != 0xe3
Switching to ANSI allocator stops the crash and the ar session works fine.
Please select what you are reporting on:
Creative
What Type of Bug are you experiencing?
Stability
Steps to Reproduce
Build an standard AR app on MAC.
Build and deploy with XCODE 26.1
Run on IOS and start an AR session.
You’ll see an instant crash.
Expected Result
No crash, operates normally.
Observed Result
MallocBinned2 realloc crash
Platform(s)
IOS