OOM on dyld parse for 19H386-15.8.3

[ro-achterberg]

What happened?

I tried to parse the dyld_shared_cache for iOS 15.8.3, but ran OOM on two machines that respectively have 64G and 32G internal memory. I was able to parse other dyld caches without problems, for much bigger ipsws as well.

How can we reproduce this?

ipsw dyld extract -a --objc --slide --stubs --output output_dir "19H386__iPhone9,2_4/dyld_shared_cache_arm64"

ipsw version

Version: 3.1.540, BuildCommit: d0df28bf4c3612411d32be55a80de3f30d7e9256
Version: 3.1.528, BuildCommit: 455d715be5c1e12dcb6d456231600fce07f18e39
Whatever the build was on Aug 30 when I did a build from source using https://github.com/blacktop/ipsw.git

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Additional context

runtime: VirtualAlloc of 74710704128 bytes failed with errno=1455
fatal error: out of memory