[SR-4853] Compiler assertion in recent snapshot.

[swift-ci]

Previous ID	SR-4853
Radar	None
Original Reporter	maik (JIRA User)
Type	Bug

Environment

Swift snapshot from May 9, 2017 and Xcode 8.3.2

Additional Detail from JIRA

Votes	1
Component/s	Compiler
Labels	Bug, CompilerCrash
Assignee	None
Priority	Medium

md5: 2a0f7f3f25c710a66eafc5658b998e33

relates to:

• SR-4850 Assertion failed: (Val && "isa<> used on a null pointer"), function doit

Issue Description:

The compiler will generate the following assertion both in Debug and Single-File-Optimization mode. If WMO is checked, then the build will succeed.

Assertion failed: (Val && "isa<> used on a null pointer"), function doit, file /Users/buildnode/jenkins/workspace/oss-swift-package-osx/llvm/include/llvm/Support/Casting.h, line 95.
0  swift                    0x0000000108918998 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  swift                    0x0000000108917966 llvm::sys::RunSignalHandlers() + 86
2  swift                    0x0000000108918f59 SignalHandler(int) + 361
3  libsystem_platform.dylib 0x00007fff8ca36b3a _sigtramp + 26
4  libsystem_platform.dylib 000000000000000000 _sigtramp + 1935447264
5  libsystem_c.dylib        0x00007fff8c8bb420 abort + 129
6  libsystem_c.dylib        0x00007fff8c882893 basename_r + 0
7  swift                    0x00000001062f2149 swift::ModuleFile::finishNormalConformance(swift::NormalProtocolConformance*, unsigned long long) + 4249
8  swift                    0x000000010674a6e3 swift::NormalProtocolConformance::resolveLazyInfo() const + 99
9  swift                    0x0000000106324d95 swift::serialization::Serializer::writeNormalConformance(swift::NormalProtocolConformance const*) + 661
10 swift                    0x000000010633340b swift::serialization::Serializer::writeAllDeclsAndTypes() + 2699
11 swift                    0x0000000106334898 swift::serialization::Serializer::writeAST(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, bool) + 3288
12 swift                    0x000000010633955b swift::serialization::Serializer::writeToStream(llvm::raw_ostream&, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SILModule const*, swift::SerializationOptions const&) + 139
13 swift                    0x000000010636a0e3 void llvm::function_ref<void (llvm::raw_ostream&)>::callback_fn<swift::serialize(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*)::$_4>(long, llvm::raw_ostream&) + 179
14 swift                    0x000000010633a6eb withOutputFile(swift::ASTContext&, llvm::StringRef, llvm::function_ref<void (llvm::raw_ostream&)>) + 395
15 swift                    0x000000010633a4dc swift::serialize(llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::SerializationOptions const&, swift::SILModule const*) + 220
16 swift                    0x000000010571728c performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 10428
17 swift                    0x00000001057138fa swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2650
18 swift                    0x00000001056d03a0 main + 3312
19 libdyld.dylib            0x00007fff8c827235 start + 1
20 libdyld.dylib            0x000000000000003c start + 1937608200

The path to the file is also strange, as there is no such user on my system.

Unfortunately I cannot share the project.

[belkadan]

Can you at least give the information at the end of the stack trace? (The "While…" part.) Otherwise I'm afraid we'll have to close this out as insufficient information.

[swift-ci]

Comment by Maik Bastian (JIRA)

There seems to be no "while" part. Only the program arguments are printed after the stack trace.

[belkadan]

Hm, okay. Guess we should add more tracing on our side.