[llvm-bugs] [Bug 35410] New: clang crashes (SEGV) with -Wall when passing a variable array into a lambda
via llvm-bugs
llvm-bugs at lists.llvm.org
Fri Nov 24 03:03:54 PST 2017
https://bugs.llvm.org/show_bug.cgi?id=35410
Bug ID: 35410
Summary: clang crashes (SEGV) with -Wall when passing a
variable array into a lambda
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangbugs at nondot.org
Reporter: mober.at at gmail.com
CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
Created attachment 19468
--> https://bugs.llvm.org/attachment.cgi?id=19468&action=edit
Sample source
HostOS: Ubuntu 17.04
Clang: 6.0-trunk as per 20171120
The clang++ front-end crashes on the attached source code when -Wall is
specified. Without -Wall, it reports:
clangex.cpp:32:14: error: variable-sized object may not be initialized
thread t( [timers]() {
^~~~~~
Command-line:
clang++ -c -std=c++14 -Wall -o clangex.o clangex.cpp
Crash output:
#0 0x00007f3b70b304fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1+0x8264fa)
#1 0x00007f3b70b2e68e llvm::sys::RunSignalHandlers()
(/usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1+0x82468e)
#2 0x00007f3b70b2e7ca (/usr/lib/llvm-6.0/bin/../lib/libLLVM-6.0.so.1+0x8247ca)
#3 0x00007f3b73c3c670 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11670)
#4 0x0000556763b29def
clang::FormatASTNodeDiagnosticArgument(clang::DiagnosticsEngine::ArgumentKind,
long, llvm::StringRef, llvm::StringRef,
llvm::ArrayRef<std::pair<clang::DiagnosticsEngine::ArgumentKind, long> >,
llvm::SmallVectorImpl<char>&, void*, llvm::ArrayRef<long>)
(/usr/lib/llvm-6.0/bin/clang+0x178cdef)
#5 0x00005567629a3669 clang::Diagnostic::FormatDiagnostic(char const*, char
const*, llvm::SmallVectorImpl<char>&) const
(/usr/lib/llvm-6.0/bin/clang+0x606669)
#6 0x0000556762db728e
clang::TextDiagnosticPrinter::HandleDiagnostic(clang::DiagnosticsEngine::Level,
clang::Diagnostic const&) (/usr/lib/llvm-6.0/bin/clang+0xa1a28e)
#7 0x00005567629a7c40 clang::DiagnosticIDs::EmitDiag(clang::DiagnosticsEngine&,
clang::DiagnosticIDs::Level) const (/usr/lib/llvm-6.0/bin/clang+0x60ac40)
#8 0x00005567629a7dbf
clang::DiagnosticIDs::ProcessDiag(clang::DiagnosticsEngine&) const
(/usr/lib/llvm-6.0/bin/clang+0x60adbf)
#9 0x00005567629a19b4 clang::DiagnosticsEngine::EmitCurrentDiagnostic(bool)
(/usr/lib/llvm-6.0/bin/clang+0x6049b4)
#10 0x000055676321a46a clang::Sema::EmitCurrentDiagnostic(unsigned int)
(/usr/lib/llvm-6.0/bin/clang+0xe7d46a)
#11 0x00005567634d5655 clang::Sema::BuildLambdaExpr(clang::SourceLocation,
clang::SourceLocation, clang::sema::LambdaScopeInfo*)
(/usr/lib/llvm-6.0/bin/clang+0x1138655)
#12 0x00005567634d7aba clang::Sema::ActOnLambdaExpr(clang::SourceLocation,
clang::Stmt*, clang::Scope*) (/usr/lib/llvm-6.0/bin/clang+0x113aaba)
#13 0x00005567630a44e5
clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&)
(/usr/lib/llvm-6.0/bin/clang+0xd074e5)
#14 0x00005567630a5d6b clang::Parser::ParseLambdaExpression()
(/usr/lib/llvm-6.0/bin/clang+0xd08d6b)
#15 0x0000556763091d07 clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState, bool) (/usr/lib/llvm-6.0/bin/clang+0xcf4d07)
#16 0x0000556763092c34 clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState, bool) (/usr/lib/llvm-6.0/bin/clang+0xcf5c34)
#17 0x0000556763092ccc
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/usr/lib/llvm-6.0/bin/clang+0xcf5ccc)
#18 0x0000556763094d89
clang::Parser::ParseExpressionList(llvm::SmallVectorImpl<clang::Expr*>&,
llvm::SmallVectorImpl<clang::SourceLocation>&, llvm::function_ref<void ()>)
(/usr/lib/llvm-6.0/bin/clang+0xcf7d89)
#19 0x000055676306291a
clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*)
(/usr/lib/llvm-6.0/bin/clang+0xcc591a)
#20 0x00005567630706cd clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
unsigned int, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/usr/lib/llvm-6.0/bin/clang+0xcd36cd)
#21 0x0000556763073994 clang::Parser::ParseSimpleDeclaration(unsigned int,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool,
clang::Parser::ForRangeInit*) (/usr/lib/llvm-6.0/bin/clang+0xcd6994)
#22 0x0000556763073c9e clang::Parser::ParseDeclaration(unsigned int,
clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&)
(/usr/lib/llvm-6.0/bin/clang+0xcd6c9e)
#23 0x00005567630da5bd
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/usr/lib/llvm-6.0/bin/clang+0xd3d5bd)
#24 0x00005567630da76f
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*)
(/usr/lib/llvm-6.0/bin/clang+0xd3d76f)
#25 0x00005567630df371 clang::Parser::ParseCompoundStatementBody(bool)
(/usr/lib/llvm-6.0/bin/clang+0xd42371)
#26 0x00005567630dfa5e clang::Parser::ParseCompoundStatement(bool, unsigned
int) (/usr/lib/llvm-6.0/bin/clang+0xd42a5e)
#27 0x00005567630dfa92 clang::Parser::ParseCompoundStatement(bool)
(/usr/lib/llvm-6.0/bin/clang+0xd42a92)
#28 0x00005567630da2ca
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/usr/lib/llvm-6.0/bin/clang+0xd3d2ca)
#29 0x00005567630da76f
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*)
(/usr/lib/llvm-6.0/bin/clang+0xd3d76f)
#30 0x00005567630da8e4 clang::Parser::ParseStatement(clang::SourceLocation*,
bool) (/usr/lib/llvm-6.0/bin/clang+0xd3d8e4)
#31 0x00005567630dde44 clang::Parser::ParseIfStatement(clang::SourceLocation*)
(/usr/lib/llvm-6.0/bin/clang+0xd40e44)
#32 0x00005567630da14b
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/usr/lib/llvm-6.0/bin/clang+0xd3d14b)
#33 0x00005567630da76f
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::AllowedConstructsKind, clang::SourceLocation*)
(/usr/lib/llvm-6.0/bin/clang+0xd3d76f)
#34 0x00005567630df371 clang::Parser::ParseCompoundStatementBody(bool)
(/usr/lib/llvm-6.0/bin/clang+0xd42371)
#35 0x00005567630e1c10 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&) (/usr/lib/llvm-6.0/bin/clang+0xd44c10)
#36 0x000055676304f2cd
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/usr/lib/llvm-6.0/bin/clang+0xcb22cd)
#37 0x0000556763070d82 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
unsigned int, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/usr/lib/llvm-6.0/bin/clang+0xcd3d82)
#38 0x000055676304a28a
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/usr/lib/llvm-6.0/bin/clang+0xcad28a)
#39 0x000055676304a9a1 (/usr/lib/llvm-6.0/bin/clang+0xcad9a1)
#40 0x000055676304a9df
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier)
(/usr/lib/llvm-6.0/bin/clang+0xcad9df)
#41 0x0000556763051868
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*) (/usr/lib/llvm-6.0/bin/clang+0xcb4868)
#42 0x0000556763052446
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/usr/lib/llvm-6.0/bin/clang+0xcb5446)
#43 0x000055676304677b clang::ParseAST(clang::Sema&, bool, bool)
(/usr/lib/llvm-6.0/bin/clang+0xca977b)
#44 0x0000556762f11117 clang::CodeGenAction::ExecuteAction()
(/usr/lib/llvm-6.0/bin/clang+0xb74117)
#45 0x0000556762d6f11e clang::FrontendAction::Execute()
(/usr/lib/llvm-6.0/bin/clang+0x9d211e)
#46 0x0000556762d3c946
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/lib/llvm-6.0/bin/clang+0x99f946)
#47 0x0000556762dfb793
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/lib/llvm-6.0/bin/clang+0xa5e793)
#48 0x000055676299aaf0 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/lib/llvm-6.0/bin/clang+0x5fdaf0)
#49 0x00005567629874c4 main (/usr/lib/llvm-6.0/bin/clang+0x5ea4c4)
#50 0x00007f3b6f4893f1 __libc_start_main
/build/glibc-mXZSwJ/glibc-2.24/csu/../csu/libc-start.c:325:0
#51 0x000055676299880a _start (/usr/lib/llvm-6.0/bin/clang+0x5fb80a)
Stack dump:
0. Program arguments: /usr/lib/llvm-6.0/bin/clang -cc1 -triple
x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name clangex.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-notes-file
/home/mober/work/clangex.gcno -resource-dir /usr/lib/llvm-6.0/lib/clang/6.0.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward
-internal-isystem /usr/include/clang/6.0.0/include/ -internal-isystem
/usr/local/include -internal-isystem /usr/lib/llvm-6.0/lib/clang/6.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -Wall
-std=c++14 -fdeprecated-macro -fdebug-compilation-dir /home/mober/work
-ferror-limit 19 -fmessage-length 204 -fobjc-runtime=gcc -fcxx-exceptions
-fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o clangex.o -x c++
clangex.cpp
1. clangex.cpp:34:5: current parser token ')'
2. clangex.cpp:19:1: parsing function body
'SessionManager::destroySession'
3. clangex.cpp:19:1: in compound statement ('{}')
4. clangex.cpp:22:16: in compound statement ('{}')
5. clangex.cpp:32:13: lambda expression parsing
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 6.0.0-svn318632-1~exp1 (trunk)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-6.0/bin
clang: 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: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang: note: diagnostic msg: /tmp/clangex-264826.cpp
clang: note: diagnostic msg: /tmp/clangex-264826.sh
clang: note: diagnostic msg:
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