Compiler crash regression in 6.1

[jpsim]

Description

Code that used to compile in Swift 6.0.3 now crashes the compiler with Swift 6.1.

Reproduction

Contents of crash_test.swift:

@propertyWrapper
struct W<T> {
  var wrappedValue: T
  var projectedValue: W { self }
}

actor A {
  @W var x = 1

  func f() async -> Int {
    @W var x = 2
    return await Task.detached {
      return $x.wrappedValue
    }.value
  }
}

This compiles with Swift 6.0.3 but not Swift 6.1:

$ DEVELOPER_DIR=/Applications/Xcode-16.2.0.app/Contents/Developer xcrun swiftc -O -enable-actor-data-race-checks crash_test.swift
$ echo $?
0
$ DEVELOPER_DIR=/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer xcrun swiftc -O -enable-actor-data-race-checks crash_test.swift  
error: compile command failed due to signal 11 (use -v to see invocation)
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0.	Program arguments: /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file crash_test.swift -target arm64-apple-macosx15.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -color-diagnostics -O -enable-actor-data-race-checks -new-driver-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -module-name crash_test -disable-clang-spi -target-sdk-version 15.4 -target-sdk-name macosx15.4 -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -in-process-plugin-server-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -enable-default-cmo -o /var/folders/d4/klf7m4jx3cgcdmz7n2sbsq5w0000gn/T/TemporaryDirectory.Illn3T/crash_test-1.o
1.	Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
2.	Compiling with effective version 5.10
3.	While evaluating request IRGenRequest(IR Generation for file "crash_test.swift")
4.	While emitting IR SIL function "@$s10crash_test1AC1fSiyYaFSiyYacfU_".
 for expression at [crash_test.swift:12:32 - line:14:5] RangeText="{
      return $x.wrappedValue
    "
5.	While lowering use of witness method SIL decl '#Actor.unownedExecutor!getter'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x0000000108e2ac28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x0000000108e28a60 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x0000000108e2b264 SignalHandler(int) + 360
3  libsystem_platform.dylib 0x000000018d08ade4 _sigtramp + 56
4  swift-frontend           0x00000001032f1170 (anonymous namespace)::IRGenSILFunction::visitSILBasicBlock(swift::SILBasicBlock*) + 38616
5  swift-frontend           0x00000001032e638c (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 15860
6  swift-frontend           0x00000001032e20e0 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2788
7  swift-frontend           0x000000010310799c swift::irgen::IRGenerator::emitLazyDefinitions() + 5288
8  swift-frontend           0x0000000103293ae4 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 4528
9  swift-frontend           0x00000001032e133c swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)17>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 180
10 swift-frontend           0x000000010329cf28 swift::IRGenRequest::OutputType swift::Evaluator::getResultUncached<swift::IRGenRequest, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()>(swift::IRGenRequest const&, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()) + 812
11 swift-frontend           0x0000000103296688 swift::performIRGeneration(swift::FileUnit*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::GlobalVariable**) + 176
12 swift-frontend           0x0000000102c81af0 generateIR(swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, llvm::GlobalVariable*&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>) + 156
13 swift-frontend           0x0000000102c7d07c performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 2108
14 swift-frontend           0x0000000102c7c0a8 swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1036
15 swift-frontend           0x0000000102c7f654 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1764
16 swift-frontend           0x0000000102c7dfd8 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3716
17 swift-frontend           0x0000000102c020bc swift::mainEntry(int, char const**) + 5428
18 dyld                     0x000000018ccd4274 start + 2840

Stack dump

0.	Program arguments: /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file crash_test.swift -target arm64-apple-macosx15.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -color-diagnostics -O -enable-actor-data-race-checks -new-driver-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -module-name crash_test -disable-clang-spi -target-sdk-version 15.4 -target-sdk-name macosx15.4 -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -in-process-plugin-server-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -enable-default-cmo -o /var/folders/d4/klf7m4jx3cgcdmz7n2sbsq5w0000gn/T/TemporaryDirectory.Illn3T/crash_test-1.o
1.	Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
2.	Compiling with effective version 5.10
3.	While evaluating request IRGenRequest(IR Generation for file "crash_test.swift")
4.	While emitting IR SIL function "@$s10crash_test1AC1fSiyYaFSiyYacfU_".
 for expression at [crash_test.swift:12:32 - line:14:5] RangeText="{
      return $x.wrappedValue
    "
5.	While lowering use of witness method SIL decl '#Actor.unownedExecutor!getter'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x0000000108e2ac28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x0000000108e28a60 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x0000000108e2b264 SignalHandler(int) + 360
3  libsystem_platform.dylib 0x000000018d08ade4 _sigtramp + 56
4  swift-frontend           0x00000001032f1170 (anonymous namespace)::IRGenSILFunction::visitSILBasicBlock(swift::SILBasicBlock*) + 38616
5  swift-frontend           0x00000001032e638c (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 15860
6  swift-frontend           0x00000001032e20e0 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2788
7  swift-frontend           0x000000010310799c swift::irgen::IRGenerator::emitLazyDefinitions() + 5288
8  swift-frontend           0x0000000103293ae4 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 4528
9  swift-frontend           0x00000001032e133c swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)17>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 180
10 swift-frontend           0x000000010329cf28 swift::IRGenRequest::OutputType swift::Evaluator::getResultUncached<swift::IRGenRequest, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()>(swift::IRGenRequest const&, swift::IRGenRequest::OutputType swift::evaluateOrFatal<swift::IRGenRequest>(swift::Evaluator&, swift::IRGenRequest)::'lambda'()) + 812
11 swift-frontend           0x0000000103296688 swift::performIRGeneration(swift::FileUnit*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::GlobalVariable**) + 176
12 swift-frontend           0x0000000102c81af0 generateIR(swift::IRGenOptions const&, swift::TBDGenOptions const&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, swift::PrimarySpecificPaths const&, llvm::StringRef, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, llvm::GlobalVariable*&, llvm::ArrayRef<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>) + 156
13 swift-frontend           0x0000000102c7d07c performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 2108
14 swift-frontend           0x0000000102c7c0a8 swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1036
15 swift-frontend           0x0000000102c7f654 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1764
16 swift-frontend           0x0000000102c7dfd8 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3716
17 swift-frontend           0x0000000102c020bc swift::mainEntry(int, char const**) + 5428
18 dyld                     0x000000018ccd4274 start + 2840

Expected behavior

Should compile with the Swift 6.1 compiler as it does in Swift 6.0.3.

Environment

swift-driver version: 1.120.5 Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
Target: arm64-apple-macosx15.0

Additional information

No response

[jpsim]

Crash looks a bit different in Swift 6 language mode:

$ DEVELOPER_DIR=/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer xcrun swiftc -O -swift-version 6 -enable-actor-data-race-checks crash_test.swift 
error: compile command failed due to signal 6 (use -v to see invocation)
BadInst:   %3 = extract_executor %0 : ${ var W<Int> }      // user: %10
<unknown>:0: error: fatal error encountered during compilation; please submit a bug report (https://swift.org/contributing/#reporting-bugs)
<unknown>:0: note: send-non-sendable: Found instruction that is not allowed to have non-Sendable parameters with such parameters?!
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0.	Program arguments: /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file crash_test.swift -target arm64-apple-macosx15.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk -color-diagnostics -swift-version 6 -O -enable-actor-data-race-checks -new-driver-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-driver -empty-abi-descriptor -resource-dir /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift -module-name crash_test -disable-clang-spi -target-sdk-version 15.4 -target-sdk-name macosx15.4 -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -external-plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server -in-process-plugin-server-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Applications/Xcode-16.3.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/local/lib/swift/host/plugins -enable-default-cmo -o /var/folders/d4/klf7m4jx3cgcdmz7n2sbsq5w0000gn/T/TemporaryDirectory.JVsL13/crash_test-1.o
1.	Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
2.	Compiling with the current language version
3.	While evaluating request ExecuteSILPipelineRequest(Run pipelines { Mandatory Diagnostic Passes + Enabling Optimization Passes } on SIL for crash_test)
4.	While running pass #247 SILFunctionTransform "SendNonSendable" on SILFunction "@$s10crash_test1AC1fSiyYaF2$xL_AA1WVySiGvg".
 for getter for $x (at crash_test.swift:11:12)
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-frontend           0x000000010a8d6c28 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1  swift-frontend           0x000000010a8d4a60 llvm::sys::RunSignalHandlers() + 112
2  swift-frontend           0x000000010a8d7264 SignalHandler(int) + 360
3  libsystem_platform.dylib 0x000000018d08ade4 _sigtramp + 56
4  libsystem_pthread.dylib  0x000000018d053f70 pthread_kill + 288
5  libsystem_c.dylib        0x000000018cf60908 abort + 128
6  swift-frontend           0x0000000104acb764 swift::DiagnosticHelper::~DiagnosticHelper() + 0
7  swift-frontend           0x000000010a84667c llvm::report_fatal_error(llvm::Twine const&, bool) + 280
8  swift-frontend           0x000000010a846564 llvm::report_fatal_error(llvm::Twine const&, bool) + 0
9  swift-frontend           0x0000000105338ca0 swift::regionanalysisimpl::PartitionOpTranslator::translateSILInstruction(swift::SILInstruction*) + 3128
10 swift-frontend           0x00000001053356a8 swift::RegionAnalysis::newFunctionAnalysis(swift::SILFunction*) + 2360
11 swift-frontend           0x000000010558b2d8 (anonymous namespace)::SendNonSendable::run() + 308
12 swift-frontend           0x00000001055c7810 swift::SILPassManager::runFunctionPasses(unsigned int, unsigned int) + 3336
13 swift-frontend           0x00000001055c3c54 swift::SILPassManager::executePassPipelinePlan(swift::SILPassPipelinePlan const&) + 12100
14 swift-frontend           0x00000001055fec50 swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::evaluateRequest(swift::ExecuteSILPipelineRequest const&, swift::Evaluator&) + 52
15 swift-frontend           0x00000001055e26e0 swift::ExecuteSILPipelineRequest::OutputType swift::Evaluator::getResultUncached<swift::ExecuteSILPipelineRequest, swift::ExecuteSILPipelineRequest::OutputType swift::evaluateOrFatal<swift::ExecuteSILPipelineRequest>(swift::Evaluator&, swift::ExecuteSILPipelineRequest)::'lambda'()>(swift::ExecuteSILPipelineRequest const&, swift::ExecuteSILPipelineRequest::OutputType swift::evaluateOrFatal<swift::ExecuteSILPipelineRequest>(swift::Evaluator&, swift::ExecuteSILPipelineRequest)::'lambda'()) + 412
16 swift-frontend           0x00000001055e59e0 swift::runSILDiagnosticPasses(swift::SILModule&) + 416
17 swift-frontend           0x0000000104ae866c swift::CompilerInstance::performSILProcessing(swift::SILModule*) + 656
18 swift-frontend           0x0000000104728d90 performCompileStepsPostSILGen(swift::CompilerInstance&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule>>, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 1360
19 swift-frontend           0x00000001047280a8 swift::performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1036
20 swift-frontend           0x000000010472b654 performCompile(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 1764
21 swift-frontend           0x0000000104729fd8 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 3716
22 swift-frontend           0x00000001046ae0bc swift::mainEntry(int, char const**) + 5428
23 dyld                     0x000000018ccd4274 start + 2840

[tbkka]

RegionAnalysis => @gottesmm

[gottesmm]

@tbkka Thank you!

[grynspan]

Looks like this affects C functions capturing state, which should diagnose as "A C function pointer cannot be formed from a closure that captures context" but instead produce the crash above.