Remangling fails on 6.0-nightly

[glbrntt]

Description

Remangling fails using the 6.0-nightly toolchains (6.0.3) for http://github.com/grpc/grpc-swift-nio-transport/. This doesn't with 6.0.2.

Reproduction

• Checkout http://github.com/grpc/grpc-swift-nio-transport/ at 7b9b6f301e994ec3d4fa53fae3d4cb22465c27cc
• With a 6.0-nightly Linux toolchain run swift build

Stack dump

Stack dump:
0.	Program arguments: /usr/bin/swift-frontend -frontend -c -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/ClientConnectionHandler.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/Connection.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/ConnectionBackoff.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/ConnectionFactory.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/ConnectivityState.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/GRPCChannel.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/LoadBalancers/LoadBalancer.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/LoadBalancers/LoadBalancerEvent.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/LoadBalancers/PickFirstLoadBalancer.swift -primary-file /code/Sources/GRPCNIOTransportCore/Client/Connection/LoadBalancers/RoundRobinLoadBalancer.swift /code/Sources/GRPCNIOTransportCore/Client/Connection/LoadBalancers/Subchannel.swift /code/Sources/GRPCNIOTransportCore/Client/Connection/RequestQueue.swift /code/Sources/GRPCNIOTransportCore/Client/GRPCClientStreamHandler.swift /code/Sources/GRPCNIOTransportCore/Client/HTTP2ClientTransport.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/DNSResolver.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver+DNS.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver+IPv4.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver+IPv6.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver+UDS.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver+VSOCK.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolver.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/NameResolverRegistry.swift /code/Sources/GRPCNIOTransportCore/Client/Resolver/SocketAddress.swift /code/Sources/GRPCNIOTransportCore/Compression/CompressionAlgorithm.swift /code/Sources/GRPCNIOTransportCore/Compression/Zlib.swift /code/Sources/GRPCNIOTransportCore/GRPCMessageDecoder.swift /code/Sources/GRPCNIOTransportCore/GRPCMessageFramer.swift /code/Sources/GRPCNIOTransportCore/GRPCStreamStateMachine.swift /code/Sources/GRPCNIOTransportCore/Internal/CallOptions+MethodConfig.swift /code/Sources/GRPCNIOTransportCore/Internal/ConstantAsyncSequence.swift /code/Sources/GRPCNIOTransportCore/Internal/ContentType.swift /code/Sources/GRPCNIOTransportCore/Internal/DiscardingTaskGroup+CancellableHandle.swift /code/Sources/GRPCNIOTransportCore/Internal/GRPCStatusMessageMarshaller.swift /code/Sources/GRPCNIOTransportCore/Internal/MethodConfigs.swift /code/Sources/GRPCNIOTransportCore/Internal/NIOChannelPipeline+GRPC.swift /code/Sources/GRPCNIOTransportCore/Internal/NIOSocketAddress+GRPCSocketAddress.swift /code/Sources/GRPCNIOTransportCore/Internal/PercentEncoding.swift /code/Sources/GRPCNIOTransportCore/Internal/ProcessUniqueID.swift /code/Sources/GRPCNIOTransportCore/Internal/Result+Catching.swift /code/Sources/GRPCNIOTransportCore/Internal/Timer.swift /code/Sources/GRPCNIOTransportCore/ListeningServerTransport.swift /code/Sources/GRPCNIOTransportCore/OneOrManyQueue.swift /code/Sources/GRPCNIOTransportCore/Server/CommonHTTP2ServerTransport.swift /code/Sources/GRPCNIOTransportCore/Server/Connection/GRPCServerFlushNotificationHandler.swift /code/Sources/GRPCNIOTransportCore/Server/Connection/ServerConnection.swift /code/Sources/GRPCNIOTransportCore/Server/Connection/ServerConnectionManagementHandler+StateMachine.swift /code/Sources/GRPCNIOTransportCore/Server/Connection/ServerConnectionManagementHandler.swift /code/Sources/GRPCNIOTransportCore/Server/GRPCServerStreamHandler.swift /code/Sources/GRPCNIOTransportCore/Server/HTTP2ListenerFactory.swift /code/Sources/GRPCNIOTransportCore/Server/HTTP2ServerTransport.swift /code/Sources/GRPCNIOTransportCore/TLSConfig.swift -supplementary-output-file-map /tmp/TemporaryDirectory.gSBiF9/supplementaryOutputs-1 -target aarch64-unknown-linux-gnu -Xllvm -aarch64-use-tbi -disable-objc-interop -I /code/.build/aarch64-unknown-linux-gnu/debug/Modules -color-diagnostics -enable-testing -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path /code/.build/aarch64-unknown-linux-gnu/debug/ModuleCache -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -enable-upcoming-feature ExistentialAny -enable-upcoming-feature InternalImportsByDefault -empty-abi-descriptor -resource-dir /usr/lib/swift -enable-anonymous-context-mangled-names -file-compilation-dir /code -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CNIOLLHTTP.build/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIOLLHTTP/include -Xcc -fmodule-map-file=/code/.build/checkouts/swift-atomics/Sources/_AtomicsShims/include/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-atomics/Sources/_AtomicsShims/include -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CNIOWASI.build/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIOWASI/include -Xcc -fmodule-map-file=/code/.build/checkouts/swift-nio/Sources/CNIOWindows/include/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIOWindows/include -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CNIOLinux.build/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIOLinux/include -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CNIODarwin.build/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIODarwin/include -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CNIOAtomics.build/module.modulemap -Xcc -I -Xcc /code/.build/checkouts/swift-nio/Sources/CNIOAtomics/include -Xcc -fmodule-map-file=/code/.build/aarch64-unknown-linux-gnu/debug/CGRPCZlib.build/module.modulemap -Xcc -I -Xcc /code/Sources/CGRPCZlib/include -Xcc -fPIC -Xcc -g -Xcc -fno-omit-frame-pointer -module-name GRPCNIOTransportCore -package-name code -plugin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -parse-as-library -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/ClientConnectionHandler.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/Connection.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/ConnectionBackoff.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/ConnectionFactory.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/ConnectivityState.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/GRPCChannel.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/LoadBalancer.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/LoadBalancerEvent.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/PickFirstLoadBalancer.swift.o -o /code/.build/aarch64-unknown-linux-gnu/debug/GRPCNIOTransportCore.build/RoundRobinLoadBalancer.swift.o -index-store-path /code/.build/aarch64-unknown-linux-gnu/debug/index/store -index-system-modules
1.	Swift version 6.0.3-dev (LLVM 2e6139970eda445, Swift 7fb200b953a7343)
2.	Compiling with the current language version
3.	While evaluating request ASTLoweringRequest(Lowering AST to SIL for file "/code/Sources/GRPCNIOTransportCore/Client/Connection/GRPCChannel.swift")
4.	While silgen emitFunction SIL function "@$s20GRPCNIOTransportCore11GRPCChannelC7enqueue33_51FC59EAF52ADB56A3D23C3BFB3C88F4LL12waitForReadyAA12LoadBalancerOSb_tYaKF".
 for 'enqueue(waitForReady:)' (at /code/Sources/GRPCNIOTransportCore/Client/Connection/GRPCChannel.swift:331:11)
5.	While silgen closureexpr SIL function "@$s20GRPCNIOTransportCore11GRPCChannelC7enqueue33_51FC59EAF52ADB56A3D23C3BFB3C88F4LL12waitForReadyAA12LoadBalancerOSb_tYaKFAHyYaKXEfU_".
 for expression at [/code/Sources/GRPCNIOTransportCore/Client/Connection/GRPCChannel.swift:333:50 - line:355:5] RangeText="{
      try await withCheckedThrowingContinuation { continuation in
        if Task.isCancelled {
          continuation.resume(throwing: CancellationError())
          return
        }

        let (enqueued, loadBalancer) = self.state.withLock { state in
          state.enqueue(continuation: continuation, waitForReady: waitForReady, id: id)
        }

        if let loadBalancer = loadBalancer {
          // Attempting to pick a subchannel will trigger a connect event if the subchannel is idle.
          _ = loadBalancer.pickSubchannel()
        }

        // Not enqueued because the channel is shutdown or shutting down.
        if !enqueued {
          let error = RPCError(code: .unavailable, message: "channel is shutdown")
          continuation.resume(throwing: error)
        }
      }
    "
6.	While silgen closureexpr SIL function "@$s20GRPCNIOTransportCore11GRPCChannelC7enqueue33_51FC59EAF52ADB56A3D23C3BFB3C88F4LL12waitForReadyAA12LoadBalancerOSb_tYaKFAHyYaKXEfU_yScCyAHs5Error_pGXEfU_".
 for expression at [/code/Sources/GRPCNIOTransportCore/Client/Connection/GRPCChannel.swift:334:49 - line:354:7] RangeText="{ continuation in
        if Task.isCancelled {
          continuation.resume(throwing: CancellationError())
          return
        }

        let (enqueued, loadBalancer) = self.state.withLock { state in
          state.enqueue(continuation: continuation, waitForReady: waitForReady, id: id)
        }

        if let loadBalancer = loadBalancer {
          // Attempting to pick a subchannel will trigger a connect event if the subchannel is idle.
          _ = loadBalancer.pickSubchannel()
        }

        // Not enqueued because the channel is shutdown or shutting down.
        if !enqueued {
          let error = RPCError(code: .unavailable, message: "channel is shutdown")
          continuation.resume(throwing: error)
        }
      "

Expected behavior

Shouldn't crash.

Environment

Swift version 6.0.3-dev (LLVM 2e6139970eda445, Swift 7fb200b)
Target: aarch64-unknown-linux-gnu

Additional information

No response

[glbrntt]

Note that changing this:

        let (enqueued, loadBalancer) = self.state.withLock { state in
          state.enqueue(continuation: continuation, waitForReady: waitForReady, id: id)
        }

to:

        let (enqueued, loadBalancer) = self.state.withLock { state -> (Bool, LoadBalancer?) in
          state.enqueue(continuation: continuation, waitForReady: waitForReady, id: id)
        }

work around the issue.