Bug 434867

SUMMARY

Typed int strncpy() and it crashed.  When I restarted KDevelop and attempted to restore the file it also crashed immediately.  Since I needed to move on, I wrote the function prototype elsewhere and copied and pasted it and it worked. I know that strncpy() is not supposed to return an int.  I was doing a quick implementation from memory for a large embedded project that doesn't support it (and it's a well-known service that includes security!).

I tried typing it in another project but could not reproduce it.

OBSERVED RESULT
0x00007fffa8d51325 in clang::Sema::checkFortifiedBuiltinMemoryFunction(clang::FunctionDecl*, clang::CallExpr*) () from /usr/lib64/../lib64/libclang-cpp.so.9
(gdb) bt
#0  0x00007fffa8d51325 in clang::Sema::checkFortifiedBuiltinMemoryFunction(clang::FunctionDecl*, clang::CallExpr*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#1  0x00007fffa904a2ee in clang::Sema::BuildResolvedCallExpr(clang::Expr*, clang::NamedDecl*, clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, clang::CallExpr::ADLCallKind) () from /usr/lib64/../lib64/libclang-cpp.so.9
#2  0x00007fffa902f68f in clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#3  0x00007fffa90486e8 in clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#4  0x00007fffa8725ab4 in clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) () from /usr/lib64/../lib64/libclang-cpp.so.9
#5  0x00007fffa8728ce7 in clang::Parser::ParseCastExpression(bool, bool, bool&, clang::Parser::TypeCastState, bool) () from /usr/lib64/../lib64/libclang-cpp.so.9
#6  0x00007fffa87231b6 in clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#7  0x00007fffa877a623 in clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#8  0x00007fffa87784b9 in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#9  0x00007fffa8777f8b in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#10 0x00007fffa8781e33 in clang::Parser::ParseCompoundStatementBody(bool) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#11 0x00007fffa87786ea in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#12 0x00007fffa8777f8b in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#13 0x00007fffa877c4ba in clang::Parser::ParseIfStatement(clang::SourceLocation*) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#14 0x00007fffa87788eb in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#15 0x00007fffa8777f8b in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#16 0x00007fffa8781e33 in clang::Parser::ParseCompoundStatementBody(bool) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
#17 0x00007fffa87786ea in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#18 0x00007fffa8777f8b in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#19 0x00007fffa877c4ba in clang::Parser::ParseIfStatement(clang::SourceLocation*) ()
   from /usr/lib64/../lib64/libclang-cpp.so.9
--Type <RET> for more, q to quit, c to continue without paging--c
#20 0x00007fffa87788eb in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#21 0x00007fffa8777f8b in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#22 0x00007fffa8781e33 in clang::Parser::ParseCompoundStatementBody(bool) () from /usr/lib64/../lib64/libclang-cpp.so.9
#23 0x00007fffa87830d8 in clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) () from /usr/lib64/../lib64/libclang-cpp.so.9
#24 0x00007fffa879f8cb in clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#25 0x00007fffa86f3373 in clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#26 0x00007fffa879e5b7 in clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) () from /usr/lib64/../lib64/libclang-cpp.so.9
#27 0x00007fffa879def4 in clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) () from /usr/lib64/../lib64/libclang-cpp.so.9
#28 0x00007fffa879ccfc in clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) () from /usr/lib64/../lib64/libclang-cpp.so.9
#29 0x00007fffa879a8cd in clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) () from /usr/lib64/../lib64/libclang-cpp.so.9
#30 0x00007fffa86daaad in clang::ParseAST(clang::Sema&, bool, bool) () from /usr/lib64/../lib64/libclang-cpp.so.9
#31 0x00007fffa9fa8074 in clang::FrontendAction::Execute() () from /usr/lib64/../lib64/libclang-cpp.so.9
#32 0x00007fffa9f4b141 in clang::ASTUnit::Parse(std::shared_ptr<clang::PCHContainerOperations>, std::unique_ptr<llvm::MemoryBuffer, std::default_delete<llvm::MemoryBuffer> >, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) () from /usr/lib64/../lib64/libclang-cpp.so.9
#33 0x00007fffa9f51f47 in clang::ASTUnit::Reparse(std::shared_ptr<clang::PCHContainerOperations>, llvm::ArrayRef<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, llvm::MemoryBuffer*> >, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) () from /usr/lib64/../lib64/libclang-cpp.so.9
#34 0x00007fffaabd8857 in ?? () from /usr/lib64/libclang.so.9
#35 0x00007fffa3e7580c in llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) () from /usr/lib64/../lib64/libLLVM.so.9
#36 0x00007fffa3e75914 in ?? () from /usr/lib64/../lib64/libLLVM.so.9
#37 0x00007fffa3f43b7a in ?? () from /usr/lib64/../lib64/libLLVM.so.9
#38 0x00007fffece7b4f9 in start_thread (arg=0x7fff98d9a700) at pthread_create.c:465
#39 0x00007ffff41d6ecf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

EXPECTED RESULT
I expect it not to crash.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
libclang9-9.0.1