I'm facing similar issue when turn on ASN and "Detect use of stack after return" as well (doesn't fails when "detect" is off).
I just run the same base code from Xcode 12 on real iOS14 device and after a while I get the following log:
==3408==ERROR: AddressSanitizer: allocator is out of memory trying to allocate 0x717c5c bytes
==3408==FATAL: AddressSanitizer: internal allocator is out of memory trying to allocate 0x50 bytes
But I don't get it when run from Xcode11.5.1 and iOS13 device.
Is it a bug?
Rafaelb149
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UPDATE: it crashes on simulator only, on real device running iOS14 beta 3 it works fine