Hello, On a x86_64 host I'm building an executable that uses JIT (asmjit) and dynamically loads a library. When running on arm64, running that executable segfaults: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000058 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [2107] I'm using the following entitlements: <key>com.apple.security.cs.allow-jit</key> <true/> <key>com.apple.security.cs.allow-unsigned-executable-memory</key> <true/> <key>com.apple.security.cs.allow-dyld-environment-variables</key> <true/> <key>com.apple.security.cs.disable-library-validation</key> <true/> and that's how I sign it: codesign \ --sign "-" \ --verbose=4 \ --options=runtime \ --entitlements=erts/etc/darwin/Entitlements.plist \ release/*/erts-*/bin/* I noticed that when JIT is disabled, everything works fine. When JIT is enabled, but there's no disable-library-validation entitlement, there's no segfault but loading the library fails: dlopen(/Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so, 2): no suitable image found. Did find: /Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so: code signature in (/Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed. /Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so: stat() failed with errno=35 If I code sign the library: codesign \ --sign "-" \ --verbose=4 \ --options=runtime \ release/*/lib/crypto-*/priv/lib/crypto.so then the error becomes: dlopen(/Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so, 2): no suitable image found. Did find: /Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so: code signature in (/Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so) not valid for use in process using Library Validation: mapped file has no Team ID and is not a platform binary (signed with custom identity or adhoc?) /Users/wojtek/otp/lib/crypto-5.0.3/priv/lib/crypto.so: stat() failed with errno=35 In terms of reproducing this issue, unfortunately I wasn't able to create a minimal program that does it. You should see the error when following https://github.com/erlang/otp/pull/5036#issuecomment-933397076 though. Any guidance would be very appreciated.

Hello, I'd like to find an available TCP port. I came up with this code: #!/usr/bin/env swift import Foundation import Network func findAvailablePort() -> UInt16 { let semaphore = DispatchSemaphore(value: 0) let listener = try! NWListener(using: .tcp, on: .any) listener.stateUpdateHandler = { state in switch state { case .ready: semaphore.signal() case .failed(let e): fatalError(e.localizedDescription) default: break } } listener.newConnectionHandler = { conn in } listener.start(queue: .global()) let timeout = DispatchTime.now() + DispatchTimeInterval.seconds(5) if semaphore.wait(timeout: timeout) == .timedOut { fatalError("timeout") } return listener.port!.rawValue } print(findAvailablePort()) Any feedback, especially around error handling, would be very appreciated. (The two error conditions I've identified, network error and semaphore timeout, seem unlikely to hit so I reached for fatalError.) To give some more context, I'm writing an application with processes A and B. A starts B via Process(). B will listen on a TCP socket but A needs to know which one. (I'd rather not use stdio to let it know.) So A will find a free tcp port, start B, and pass port in argv. There's obviously a possible race condition between finding the free port and listening on it but it seems unlikely to hit given the OS doesn't seem to "recycle" free ports right away.