[SR-15566] Differentiable functions with control flow yield an assertion failure: "location is a VarDecl, but SILDebugVariable is empty" #57869
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Accidental fix #40503 |
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Unfortunately it seems this bug cropped up again in recent release (5.6, 2022-03-08) for the same tests as above: % xcrun /Library/Developer/Toolchains/swift-5.6-RELEASE.xctoolchain/usr/bin/swift --version
Apple Swift version 5.6 (swift-5.6-RELEASE)
Target: arm64-apple-macosx12.0
% xcrun /Library/Developer/Toolchains/swift-5.6-RELEASE.xctoolchain/usr/bin/swiftc crasher.swift -o crasher
error: compile command failed due to signal 6 (use -v to see invocation)
Assertion failed: ((!dyn_cast_or_null<VarDecl>(Loc.getAsASTNode<Decl>()) || Var) && "location is a VarDecl, but SILDebugVariable is empty"), function createAllocStack, file SILBuilder.h, line 389.
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0. Program arguments: /Library/Developer/Toolchains/swift-5.6-RELEASE.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file crasher.swift -target arm64-apple-macosx12.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -color-diagnostics -new-driver-path /Library/Developer/Toolchains/swift-5.6-RELEASE.xctoolchain/usr/bin/swift-driver -resource-dir /Library/Developer/Toolchains/swift-5.6-RELEASE.xctoolchain/usr/lib/swift -module-name crasher -target-sdk-version 12.3 -o /var/folders/hq/bm2zh17n5gq1xbhtvm30rj7r0000gn/T/TemporaryDirectory.XXxuRK/crasher-1.o
1. Apple Swift version 5.6 (swift-5.6-RELEASE)
2. Compiling with the current language version
3. While evaluating request ExecuteSILPipelineRequest(Run pipelines \{ Mandatory Diagnostic Passes + Enabling Optimization Passes } on SIL for crasher)
4. While running pass #​142 SILModuleTransform "Differentiation".
5. While processing // differentiability witness for Test.init(v1:)
sil_differentiability_witness [serialized] [reverse] [parameters 0] [results 0] @$s7crasher4TestV2v1ACSaySaySfGG_tcfC : $@convention(method) (@owned Array<Array<Float>>, @thin Test.Type) -> @owned Test {
}
on SIL function "@$s7crasher4TestV2v1ACSaySaySfGG_tcfC".
for 'init(v1:)' (at crasher.swift:7:12)
6. While generating VJP for SIL function "@$s7crasher4TestV2v1ACSaySaySfGG_tcfC".
for 'init(v1:)' (at crasher.swift:7:12)
7. While generating pullback for SIL function "@$s7crasher4TestV2v1ACSaySaySfGG_tcfC".
for 'init(v1:)' (at crasher.swift:7:12)
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 0x0000000106b3c9a4 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1 swift-frontend 0x0000000106b3bc04 llvm::sys::RunSignalHandlers() + 128
2 swift-frontend 0x0000000106b3d008 SignalHandler(int) + 304
3 libsystem_platform.dylib 0x000000019d5bd4c4 _sigtramp + 56
4 libsystem_pthread.dylib 0x000000019d5a5ee0 pthread_kill + 288
5 libsystem_c.dylib 0x000000019d4e0340 abort + 168
6 libsystem_c.dylib 0x000000019d4df754 err + 0
7 swift-frontend 0x0000000106b880e8 swift::SILCloner<(anonymous namespace)::TrivialCloner>::getOpType(swift::SILType) (.cold.1) + 0
8 swift-frontend 0x00000001029d8640 swift::SILBuilder::createAllocStack(swift::SILLocation, swift::SILType, llvm::Optional<swift::SILDebugVariable>, bool, bool) + 668
9 swift-frontend 0x0000000102f50ce8 swift::autodiff::TangentBuilder::emitAdd(swift::SILLocation, swift::SILValue, swift::SILValue) + 464
10 swift-frontend 0x0000000102f46cc4 swift::autodiff::PullbackCloner::Implementation::accumulateAdjointsDirect(swift::autodiff::AdjointValue, swift::autodiff::AdjointValue, swift::SILLocation) + 424
11 swift-frontend 0x0000000102f40b98 swift::autodiff::PullbackCloner::Implementation::addAdjointValue(swift::SILBasicBlock*, swift::SILValue, swift::autodiff::AdjointValue, swift::SILLocation) + 1172
12 swift-frontend 0x0000000102f4452c swift::autodiff::PullbackCloner::Implementation::visit(swift::SILInstruction*) + 200
13 swift-frontend 0x0000000102f40fbc swift::autodiff::PullbackCloner::Implementation::visitSILBasicBlock(swift::SILBasicBlock*) + 688
14 swift-frontend 0x0000000102f3e710 swift::autodiff::PullbackCloner::Implementation::run() + 5064
15 swift-frontend 0x0000000102f3d31c swift::autodiff::PullbackCloner::run() + 24
16 swift-frontend 0x0000000102f58ea8 swift::autodiff::VJPCloner::Implementation::run() + 1368
17 swift-frontend 0x0000000102f594c4 swift::autodiff::VJPCloner::run() + 24
18 swift-frontend 0x000000010304eeec (anonymous namespace)::DifferentiationTransformer::canonicalizeDifferentiabilityWitness(swift::SILDifferentiabilityWitness*, swift::autodiff::DifferentiationInvoker, swift::IsSerialized_t) + 5272
19 swift-frontend 0x000000010304d048 (anonymous namespace)::Differentiation::run() + 924
20 swift-frontend 0x00000001030a4eb4 swift::SILPassManager::runModulePass(unsigned int) + 632
21 swift-frontend 0x00000001030aa268 swift::SILPassManager::execute() + 628
22 swift-frontend 0x00000001030a1fe4 swift::SILPassManager::executePassPipelinePlan(swift::SILPassPipelinePlan const&) + 68
23 swift-frontend 0x00000001030a1f6c swift::ExecuteSILPipelineRequest::evaluate(swift::Evaluator&, swift::SILPipelineExecutionDescriptor) const + 68
24 swift-frontend 0x00000001030bfc40 swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::evaluateRequest(swift::ExecuteSILPipelineRequest const&, swift::Evaluator&) + 28
25 swift-frontend 0x00000001030ac544 llvm::Expected<swift::ExecuteSILPipelineRequest::OutputType> swift::Evaluator::getResultUncached<swift::ExecuteSILPipelineRequest>(swift::ExecuteSILPipelineRequest const&) + 252
26 swift-frontend 0x00000001030a21e0 swift::executePassPipelinePlan(swift::SILModule*, swift::SILPassPipelinePlan const&, bool, swift::irgen::IRGenModule*) + 84
27 swift-frontend 0x00000001030aebb4 swift::runSILDiagnosticPasses(swift::SILModule&) + 92
28 swift-frontend 0x0000000102967d34 swift::CompilerInstance::performSILProcessing(swift::SILModule*) + 68
29 swift-frontend 0x000000010282c608 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*) + 620
30 swift-frontend 0x000000010282be3c bool llvm::function_ref<bool (swift::CompilerInstance&)>::callback_fn<performAction(swift::CompilerInstance&, int&, swift::FrontendObserver*)::$_19>(long, swift::CompilerInstance&) + 572
31 swift-frontend 0x0000000102822a8c swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2960
32 swift-frontend 0x00000001027e1104 swift::mainEntry(int, char const**) + 524
33 dyld 0x000000010f121088 start + 516 |
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Additional Detail from JIRA
md5: cc857cf6edb138b26261ab8a61df5c82
Issue Description:
Starting with the 2021-12-04 nightly snapshot, certain differentiable functions that involve struct or local `var`s cause an assertion failure of "location is a VarDecl, but SILDebugVariable is empty". A simple reproducer is as follows:
Place the above by itself in a file and build with swiftc file.swift to trigger this failure. The full assertion text is as follows:
The text was updated successfully, but these errors were encountered: