clang crashes on invalid C++ code: Assertion `!KnownValid && "unhandled case in overloaded call candidate"' failed


Bugzilla Link	PR28638
Status	NEW
Importance	P normal
Reported by	Zhendong Su (su@cs.ucdavis.edu)
Reported on	2016-07-21 01:59:02 -0700
Last modified on	2019-06-26 16:52:59 -0700
Version	trunk
Hardware	PC All
CC	dgregor@apple.com, hans@chromium.org, leonardchan@google.com, llvm-bugs@lists.llvm.org
Fixed by commit(s)
Attachments
Blocks
Blocked by
See also
The current clang trunk crashes (without any proper diagnostics) when compiling
the following C++ test case on x86_64-linux-gnu in both 32-bit and 64-bit modes.

It is a regression from 3.8.x, which properly rejects the code.

$ clang++ -v
clang version 4.0.0 (trunk 276092)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang++-3.8 -c -std=c++11 small.cpp
small.cpp:9:15: error: no member named 'B' in 'A'
  A::template B ();
  ~~~         ^
1 error generated.
$
$ clang++ -c -std=c++11 small.cpp
clang-4.0: /tmp/llvm-builder/llvm-source-
trunk/tools/clang/lib/Sema/SemaOverload.cpp:10986: void
AddOverloadedCallCandidate(clang::Sema&, clang::DeclAccessPair,
clang::TemplateArgumentListInfo*, llvm::ArrayRef<clang::Expr*>,
clang::OverloadCandidateSet&, bool, bool): Assertion `!KnownValid && "unhandled
case in overloaded call candidate"' failed.
#0 0x0000000001d8fa95 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-4.0+0x1d8fa95)
#1 0x0000000001d8db4e llvm::sys::RunSignalHandlers() (/usr/local/clang-
trunk/bin/clang-4.0+0x1d8db4e)
#2 0x0000000001d8dcb0 SignalHandler(int) (/usr/local/clang-trunk/bin/clang-
4.0+0x1d8dcb0)
#3 0x00007f7003c98340 __restore_rt (/lib/x86_64-linux-
gnu/libpthread.so.0+0x10340)
#4 0x00007f7002a89cc9 gsignal /build/eglibc-3GlaMS/eglibc-
2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f7002a8d0d8 abort /build/eglibc-3GlaMS/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f7002a82b86 __assert_fail_base /build/eglibc-3GlaMS/eglibc-
2.19/assert/assert.c:92:0
#7 0x00007f7002a82c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#8 0x0000000002dcfef0
clang::Sema::AddOverloadedCallCandidates(clang::UnresolvedLookupExpr*,
llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool)
(/usr/local/clang-trunk/bin/clang-4.0+0x2dcfef0)
#9 0x0000000002dd00fd clang::Sema::buildOverloadedCallSet(clang::Scope*,
clang::Expr*, clang::UnresolvedLookupExpr*,
llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation,
clang::OverloadCandidateSet*, clang::ActionResult<clang::Expr*, true>*)
(/usr/local/clang-trunk/bin/clang-4.0+0x2dd00fd)
#10 0x0000000002ddd3a8 clang::Sema::BuildOverloadedCallExpr(clang::Scope*,
clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation,
llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool,
bool) (/usr/local/clang-trunk/bin/clang-4.0+0x2ddd3a8)
#11 0x0000000002c75005 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*,
clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>,
clang::SourceLocation, clang::Expr*, bool) (/usr/local/clang-trunk/bin/clang-
4.0+0x2c75005)
#12 0x00000000028da682
clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*,
true>) (/usr/local/clang-trunk/bin/clang-4.0+0x28da682)
#13 0x00000000028d5098 clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState) (/usr/local/clang-trunk/bin/clang-4.0+0x28d5098)
#14 0x00000000028d7c0d clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState) (/usr/local/clang-trunk/bin/clang-4.0+0x28d7c0d)
#15 0x00000000028d7c99
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/usr/local/clang-trunk/bin/clang-4.0+0x28d7c99)
#16 0x00000000028d7d19
clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/usr/local/clang-
trunk/bin/clang-4.0+0x28d7d19)
#17 0x0000000002918f86 clang::Parser::ParseExprStatement() (/usr/local/clang-
trunk/bin/clang-4.0+0x2918f86)
#18 0x00000000029163f7
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedContsructsKind, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&) (/usr/local/clang-trunk/bin/clang-
4.0+0x29163f7)
#19 0x000000000291654e
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedContsructsKind, clang::SourceLocation*)
(/usr/local/clang-trunk/bin/clang-4.0+0x291654e)
#20 0x000000000291ae59 clang::Parser::ParseCompoundStatementBody(bool)
(/usr/local/clang-trunk/bin/clang-4.0+0x291ae59)
#21 0x000000000291d6b9 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) (/usr/local/clang-trunk/bin/clang-4.0+0x291d6b9)
#22 0x000000000289a55b
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/usr/local/clang-trunk/bin/clang-4.0+0x289a55b)
#23 0x00000000028ba51d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
unsigned int, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/usr/local/clang-trunk/bin/clang-4.0+0x28ba51d)
#24 0x00000000028961ad
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier) (/usr/local/clang-
trunk/bin/clang-4.0+0x28961ad)
#25 0x0000000002896851
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) [clone .part.222]
(/usr/local/clang-trunk/bin/clang-4.0+0x2896851)
#26 0x000000000289688f
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) (/usr/local/clang-
trunk/bin/clang-4.0+0x289688f)
#27 0x000000000289b6d0
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/usr/local/clang-trunk/bin/clang-4.0+0x289b6d0)
#28 0x000000000289bea0
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/usr/local/clang-trunk/bin/clang-4.0+0x289bea0)
#29 0x00000000028934bb clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-4.0+0x28934bb)
#30 0x00000000025254fe clang::CodeGenAction::ExecuteAction() (/usr/local/clang-
trunk/bin/clang-4.0+0x25254fe)
#31 0x00000000022300de clang::FrontendAction::Execute() (/usr/local/clang-
trunk/bin/clang-4.0+0x22300de)
#32 0x00000000022058d6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-4.0+0x22058d6)
#33 0x00000000022be422
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/clang-
trunk/bin/clang-4.0+0x22be422)
#34 0x0000000000b18c38 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-4.0+0xb18c38)
#35 0x0000000000ac7637 main (/usr/local/clang-trunk/bin/clang-4.0+0xac7637)
#36 0x00007f7002a74ec5 __libc_start_main /build/eglibc-3GlaMS/eglibc-
2.19/csu/libc-start.c:321:0
#37 0x0000000000b14c64 _start (/usr/local/clang-trunk/bin/clang-4.0+0xb14c64)
Stack dump:
0.      Program arguments: /usr/local/clang-trunk/bin/clang-4.0 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name
small.cpp -mrelocation-model static -mthread-model posix -mdisable-fp-elim -
fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-
array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -coverage-file
/data2/small.cpp -resource-dir /usr/local/clang-trunk/bin/../lib/clang/4.0.0 -
internal-isystem /usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9 -
internal-isystem /usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/x86_64-
linux-gnu/c++/4.9 -internal-isystem /usr/lib/gcc/x86_64-linux-
gnu/4.9/../../../../include/x86_64-linux-gnu/c++/4.9 -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/backward -
internal-isystem /usr/local/include -internal-isystem /usr/local/clang-
trunk/bin/../lib/clang/4.0.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-
externc-isystem /usr/include -std=c++11 -fdeprecated-macro -fdebug-compilation-
dir /data2 -ferror-limit 19 -fmessage-length 283 -fobjc-runtime=gcc -fcxx-
exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o
small.o -x c++ small.cpp
1.      small.cpp:9:18: current parser token ')'
2.      small.cpp:7:1: parsing function body 'foo'
3.      small.cpp:7:1: in compound statement ('{}')
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 4.0.0 (trunk 276092)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
clang-4.0: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-4.0: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-4.0: note: diagnostic msg: /tmp/small-f19095.cpp
clang-4.0: note: diagnostic msg: /tmp/small-f19095.sh
clang-4.0: note: diagnostic msg:

********************
$

-----------------------------------------------------

struct A
{
  template < typename > struct B {};
};

void foo ()
{
  // should be e.g.: A::template B < int > b ();
  A::template B ();
}
Quuxplusone / LLVMBugzillaTest

clang crashes on invalid C++ code: Assertion `!KnownValid && "unhandled case in overloaded call candidate"' failed #28637
