[llvm-bugs] [Bug 49077] New: SEGV during C++17 variadic template instantiation

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Feb 7 10:43:10 PST 2021 

https://bugs.llvm.org/show_bug.cgi?id=49077

            Bug ID: 49077
           Summary: SEGV during C++17 variadic template instantiation
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alison at she-devel.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The code in question also causes g++ 10.2.1 to crash.   I'm sure it's egregious
undefined behavior.   Backtrace is below.   There is also a coredump that I can
send if that's helpful.   The g++ bug on related code is 98983.

/usr/bin/clang++ -std=c++17 -pthread -ggdb -Wall -Wextra -g -O0 -fno-inline
-fsanitize=address,undefined
-I/home/alison/gitsrc/googletest/googletest/include -I/usr/include/bcc
-I/home/alison/gitsrc/folly -I/home/alison/gitsrc/gcc
-I/home/alison/gitsrc/Cpp-Exercises -ggdb -g -fsanitize=address
-L/home/alison/gitsrc/googletest/googletest/make -lpthread
/usr/lib/x86_64-linux-gnu/libbcc.a
/usr/lib/x86_64-linux-gnu/libbcc-loader-static.a
/usr/lib/x86_64-linux-gnu/libbcc_bpf.a
/home/alison/gitsrc/fbcode-install/folly/lib/libfolly.a
/home/alison/gitsrc/fbcode-install/folly/lib/libfolly_test_util.a
async_logger_improved.cc async_enqueue_improved.cc -o async_logger_improved
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /usr/lib/llvm-11/bin/clang -cc1 -triple
x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name async_logger_improved.cc
-mrelocation-model static -mframe-pointer=all -fmath-errno -fno-rounding-math
-mconstructor-aliases -munwind-tables -target-cpu x86-64
-fno-split-dwarf-inlining -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -resource-dir /usr/lib/llvm-11/lib/clang/11.0.1 -I
/home/alison/gitsrc/googletest/googletest/include -I /usr/include/bcc -I
/home/alison/gitsrc/folly -I /home/alison/gitsrc/gcc -I
/home/alison/gitsrc/Cpp-Exercises -internal-isystem
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10
-internal-isystem
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10
-internal-isystem
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10
-internal-isystem
/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/llvm-11/lib/clang/11.0.1/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O0 -Wall -Wextra -std=c++17
-fdeprecated-macro -fdebug-compilation-dir /home/alison/gitsrc/BPF-sandbox
-ferror-limit 19
-fsanitize=address,alignment,array-bounds,bool,builtin,enum,float-cast-overflow,function,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,return,returns-nonnull-attribute,shift-base,shift-exponent,signed-integer-overflow,unreachable,vla-bound,vptr
-fsanitize-recover=alignment,array-bounds,bool,builtin,enum,float-cast-overflow,function,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,returns-nonnull-attribute,shift-base,shift-exponent,signed-integer-overflow,vla-bound,vptr
-fsanitize-system-blacklist=/usr/lib/llvm-11/lib/clang/11.0.1/share/asan_blacklist.txt
-fsanitize-address-use-after-scope -fno-assume-sane-operator-new -pthread
-fgnuc-version=4.2.1 -fno-inline -fcxx-exceptions -fexceptions
-fcolor-diagnostics -faddrsig -o /tmp/async_logger_improved-2f1eb4.o -x c++
async_logger_improved.cc 
1.      <eof> parser at end of file
2.      Per-file LLVM IR generation
3.      ./arg_classifier.h:67:6: Generating code for declaration
'arg_classify::maybe_insert_folly_sdt_probe'
4.      ./arg_classifier.h:70:73: LLVM IR generation of compound statement
('{}')
 #0 0x00007fd8e478ff8f llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbd0f8f)
 #1 0x00007fd8e478e2f0 llvm::sys::RunSignalHandlers()
(/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbcf2f0)
 #2 0x00007fd8e4790465 (/usr/lib/x86_64-linux-gnu/libLLVM-11.so.1+0xbd1465)
 #3 0x00007fd8eb968140 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x14140)
 #4 0x00007fd8ea496e6d (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x17d9e6d)
 #5 0x00007fd8ea4854b2
clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x17c84b2)
 #6 0x00007fd8ea588bf5
clang::CodeGen::CodeGenFunction::EmitAsmInput(clang::TargetInfo::ConstraintInfo
const&, clang::Expr const*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >&)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18cbbf5)
 #7 0x00007fd8ea5835f0
clang::CodeGen::CodeGenFunction::EmitAsmStmt(clang::AsmStmt const&)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c65f0)
 #8 0x00007fd8ea57d335 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt
const*, llvm::ArrayRef<clang::Attr const*>)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c0335)
 #9 0x00007fd8ea586eac
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c9eac)
#10 0x00007fd8ea5863ef
clang::CodeGen::CodeGenFunction::EmitCompoundStmt(clang::CompoundStmt const&,
bool, clang::CodeGen::AggValueSlot)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c93ef)
#11 0x00007fd8ea57d8c6
clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c08c6)
#12 0x00007fd8ea57d1ae clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt
const*, llvm::ArrayRef<clang::Attr const*>)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c01ae)
#13 0x00007fd8ea57e165
clang::CodeGen::CodeGenFunction::EmitIfStmt(clang::IfStmt const&)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c1165)
#14 0x00007fd8ea57d3e7 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt
const*, llvm::ArrayRef<clang::Attr const*>)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c03e7)
#15 0x00007fd8ea586eac
clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt
const&, bool, clang::CodeGen::AggValueSlot)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x18c9eac)
#16 0x00007fd8ea5d20a8
clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x19150a8)
#17 0x00007fd8ea5d295c
clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl,
llvm::Function*, clang::CodeGen::CGFunctionInfo const&)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x191595c)
#18 0x00007fd8ea5e986a
clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x192c86a)
#19 0x00007fd8ea5e41a2
clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl,
llvm::GlobalValue*) (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x19271a2)
#20 0x00007fd8ea5dad01 clang::CodeGen::CodeGenModule::EmitDeferred()
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x191dd01)
#21 0x00007fd8ea5d9fd8 clang::CodeGen::CodeGenModule::Release()
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x191cfd8)
#22 0x00007fd8ea65acd4 (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x199dcd4)
#23 0x00007fd8ea5c970a (/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x190c70a)
#24 0x00007fd8e9694763 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x9d7763)
#25 0x00007fd8eac600c8 clang::FrontendAction::Execute()
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1fa30c8)
#26 0x00007fd8eac16641
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x1f59641)
#27 0x00007fd8eacc6200
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/lib/x86_64-linux-gnu/libclang-cpp.so.11+0x2009200)
#28 0x00000000004131bf cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/lib/llvm-11/bin/clang+0x4131bf)
#29 0x00000000004115fe (/usr/lib/llvm-11/bin/clang+0x4115fe)
#30 0x000000000041140a main (/usr/lib/llvm-11/bin/clang+0x41140a)
#31 0x00007fd8e36f3d0a __libc_start_main ./csu/../csu/libc-start.c:308:16
#32 0x000000000040e89a _start (/usr/lib/llvm-11/bin/clang+0x40e89a)
clang: error: unable to execute command: Segmentation fault (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
Debian clang version 11.0.1-2
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang: note: diagnostic msg: Error generating preprocessed source(s).
make: *** [Makefile:71: async_logger_improved] Error 254

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