The following code crashes clang trunk at -O1 and above in both 32-bit and 64-bit modes. $: clang-trunk -v clang version 3.9.0 (trunk 257643) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/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/5.2.1 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/4.8.4 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/5.2.1 Found candidate GCC installation: /usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.3 Found candidate GCC installation: /usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.7.4 Found candidate GCC installation: /usr/local/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2 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-trunk -O1 -g small.c clang: /tmp/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1561: void llvm::DebugLocEntry::finalize(const llvm::AsmPrinter &, DebugLocStream::ListBuilder &, const llvm::DIBasicType *): Assertion `Offset <= PieceOffset && "overlapping or duplicate pieces"' failed. 0 clang 0x0000000003095008 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40 1 clang 0x0000000003095777 2 libpthread.so.0 0x00007f7473224340 3 libc.so.6 0x00007f747222ecc9 gsignal + 57 4 libc.so.6 0x00007f74722320d8 abort + 328 5 libc.so.6 0x00007f7472227b86 6 libc.so.6 0x00007f7472227c32 7 clang 0x000000000265c65a llvm::DebugLocEntry::finalize(llvm::AsmPrinter const&, llvm::DebugLocStream::ListBuilder&, llvm::DIBasicType const*) + 906 8 clang 0x000000000265bde7 llvm::DwarfDebug::collectVariableInfo(llvm::DwarfCompileUnit&, llvm::DISubprogram const*, llvm::DenseSet<std::pair<llvm::DILocalVariable const*, llvm::DILocation const*>, llvm::DenseMapInfo<std::pair<llvm::DILocalVariable const*, llvm::DILocation const*> > >&) + 1063 9 clang 0x000000000265dd90 llvm::DwarfDebug::endFunction(llvm::MachineFunction const*) + 352 10 clang 0x000000000263e231 llvm::AsmPrinter::EmitFunctionBody() + 7025 11 clang 0x0000000002318b98 12 clang 0x000000000273e089 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 153 13 clang 0x0000000002fd90d4 llvm::FPPassManager::runOnFunction(llvm::Function&) + 564 14 clang 0x0000000002fd931b llvm::FPPassManager::runOnModule(llvm::Module&) + 43 15 clang 0x0000000002fd97e5 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 869 16 clang 0x0000000000a168dd clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*) + 9693 17 clang 0x00000000009f6f38 18 clang 0x0000000000cab776 clang::ParseAST(clang::Sema&, bool, bool) + 582 19 clang 0x0000000000789d35 clang::FrontendAction::Execute() + 69 20 clang 0x0000000000752d91 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1153 21 clang 0x00000000007318dc clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3068 22 clang 0x00000000007277a8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 1176 23 clang 0x000000000072ff93 main + 12707 24 libc.so.6 0x00007f7472219ec5 __libc_start_main + 245 25 clang 0x0000000000727234 Stack dump: 0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c -mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version 2.24 -momit-leaf-frame-pointer -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.9.0 -internal-isystem /usr/local/include -internal-isystem /usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir /data2/c-hunter-results/C/instrument-bugs/REDUCED/20160114-clang-trunk-m64-g-O3-build-051234/delta -ferror-limit 19 -fmessage-length 238 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/small-ee55a9.o -x c small.c 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module 'small.c'. 4. Running pass 'X86 Assembly / Object Emitter' on function '@fn1' clang: error: unable to execute command: Aborted (core dumped) clang: error: clang frontend command failed due to signal (use -v to see invocation) clang version 3.9.0 (trunk 257643) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/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/small-e5dff4.c clang: note: diagnostic msg: /tmp/small-e5dff4.sh clang: note: diagnostic msg: ******************** $: $: cat small.c struct S0 { int f0; short f5; } b; static int a; void fn1(char p1) { struct S0 c = {3}; if (a) b = c; c.f0 = p1; } int main() { return 0; } $:
*** This bug has been marked as a duplicate of bug 26163 ***
(In reply to comment #1) > > *** This bug has been marked as a duplicate of bug 26163 *** Hi David, This bug was reported one day earlier than PR26163. May I know why this bug was resolved as a duplicate of that one?
(In reply to comment #2) > (In reply to comment #1) > > > > *** This bug has been marked as a duplicate of bug 26163 *** > > Hi David, > > This bug was reported one day earlier than PR26163. May I know why this bug > was resolved as a duplicate of that one? PR26163 was already marked as fixed, I figured that marking PR26148 as duplicate would generate less email than marking PR26148 as fixed and PR26163 as the duplicate. This would also be a little weird to anyone investigating the chronology of r257979 seeing as how it refers to PR26163, not PR26148.
I encounter this bug again. As the test case is similar to what I have reported, so I just reopen this bug report. $: clang-trunk -v clang version 3.9.0 (trunk 259077) (llvm/trunk 259085) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/bin Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.2 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.1 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2 Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0 Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8 Candidate multilib: .;@m64 Candidate multilib: 32;@m32 Candidate multilib: x32;@mx32 Selected multilib: .;@m64 $: $: clang-trunk -g -O3 small.c clang-3.9: /tmp/llvm-builder/llvm-source-trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:1579: void llvm::DebugLocEntry::finalize(const llvm::AsmPrinter&, llvm::DebugLocStream::ListBuilder&, const llvm::DIBasicType*): Assertion `Offset <= PieceOffset && "overlapping or duplicate pieces"' failed. 0 clang-3.9 0x0000000001a73fe5 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37 1 clang-3.9 0x0000000001a71d76 llvm::sys::RunSignalHandlers() + 54 2 clang-3.9 0x0000000001a71fa1 3 libpthread.so.0 0x00007f0db017b340 4 libc.so.6 0x00007f0daf32bcc9 gsignal + 57 5 libc.so.6 0x00007f0daf32f0d8 abort + 328 6 libc.so.6 0x00007f0daf324b86 7 libc.so.6 0x00007f0daf324c32 8 clang-3.9 0x0000000001f0da0c llvm::DebugLocEntry::finalize(llvm::AsmPrinter const&, llvm::DebugLocStream::ListBuilder&, llvm::DIBasicType const*) + 1148 9 clang-3.9 0x0000000001f15b96 llvm::DwarfDebug::collectVariableInfo(llvm::DwarfCompileUnit&, llvm::DISubprogram const*, llvm::DenseSet<std::pair<llvm::DILocalVariable const*, llvm::DILocation const*>, llvm::DenseMapInfo<std::pair<llvm::DILocalVariable const*, llvm::DILocation const*> > >&) + 918 10 clang-3.9 0x0000000001f15fb1 llvm::DwarfDebug::endFunction(llvm::MachineFunction const*) + 241 11 clang-3.9 0x0000000001ef85f8 llvm::AsmPrinter::EmitFunctionBody() + 1720 12 clang-3.9 0x0000000001142526 13 clang-3.9 0x000000000173aa73 llvm::FPPassManager::runOnFunction(llvm::Function&) + 643 14 clang-3.9 0x000000000173ae2b llvm::FPPassManager::runOnModule(llvm::Module&) + 43 15 clang-3.9 0x000000000173b13f llvm::legacy::PassManagerImpl::run(llvm::Module&) + 751 16 clang-3.9 0x0000000001b929bc clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*) + 3660 17 clang-3.9 0x0000000002108b03 18 clang-3.9 0x000000000240b86b clang::ParseAST(clang::Sema&, bool, bool) + 571 19 clang-3.9 0x0000000002108bee clang::CodeGenAction::ExecuteAction() + 78 20 clang-3.9 0x0000000001e64f56 clang::FrontendAction::Execute() + 534 21 clang-3.9 0x0000000001e41e1e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 318 22 clang-3.9 0x0000000001ee7b1a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2090 23 clang-3.9 0x00000000009bf798 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) + 2344 24 clang-3.9 0x000000000097ca85 main + 6213 25 libc.so.6 0x00007f0daf316ec5 __libc_start_main + 245 26 clang-3.9 0x00000000009bb7f4 Stack dump: 0. Program arguments: /usr/local/clang-trunk/bin/clang-3.9 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c -mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -momit-leaf-frame-pointer -dwarf-column-info -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.9.0 -c-isystem . -c-isystem /usr/local/include/csmith-2.2.0/ -c-isystem /usr/local/include/csmith-2.2.0/ -internal-isystem /usr/local/include -internal-isystem /usr/local/clang-trunk/bin/../lib/clang/3.9.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -fdebug-compilation-dir /home/cnsun/ramdisk/speculative-execution/run-7/res/20160128-clang-trunk-m32-g-O3-build-074207/delta -ferror-limit 19 -fmessage-length 261 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o /home/cnsun/ramdisk/tmp/small-68d5fe.o -x c small.c 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module 'small.c'. 4. Running pass 'X86 Assembly / Object Emitter' on function '@fn1' clang-3.9: error: unable to execute command: Aborted (core dumped) clang-3.9: error: clang frontend command failed due to signal (use -v to see invocation) clang version 3.9.0 (trunk 259077) (llvm/trunk 259085) Target: x86_64-unknown-linux-gnu Thread model: posix InstalledDir: /usr/local/bin clang-3.9: 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-3.9: note: diagnostic msg: ******************** PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-f859c3.c clang-3.9: note: diagnostic msg: /home/cnsun/ramdisk/tmp/small-f859c3.sh clang-3.9: note: diagnostic msg: ******************** $: cat small.c struct S0 { short f0; int f3; } a; void fn1(short p1) { struct S0 b, c = {3}; b.f3 = p1; a = b = c; } int main() { return 0; } $:
+Keno who looked at PR26163
Thanks, I'll take a look tomorrow.
Patch at http://reviews.llvm.org/D16742.
Landed as r259696. Which reminds me that this probably needs to be put on the release branch if it hasn't already.