Segmentation fault using --objc on Xcode 13/iOS 15 binaries

[MLKrisJohnson]

I get a segmentation fault when I try to run dsdump --objc on binaries included with the iOS 15 Developer Disk Image on the Xcode 13 beta.

Reproduction steps:

• Download Xcode 13 beta from https://download.developer.apple.com/Developer_Tools/Xcode_13_beta/Xcode_13_beta.xip, decompress it, and put it in your /Applications folder.
• Mount the iOS 15 DDI with open /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/15.0/DeveloperDiskImage.dmg
• Execute any of these commands, which will result in output like [1] 11043 segmentation fault dsdump --objc --arch arm64 -U -vv:
  • dsdump --objc --arch arm64 -U -vv /Volumes/DeveloperDiskImage/Library/Frameworks/XCTest.framework/XCTest
  • dsdump --objc --arch arm64 -U -vv /Volumes/DeveloperDiskImage/usr/libexec/testmanagerd
  • dsdump --objc --arch arm64 -U -vv /Volumes/DeveloperDiskImage/Library/PrivateFrameworks/XCTAutomationSupport.framework/XCTAutomationSupport

Without the --objc option, there is no segmentation fault.