clang crashes at -O0 (and above) on x86_64-linux-gnu

[zhendongsu]

Bugzilla Link	18999
Resolution	FIXED
Resolved on	Feb 28, 2014 05:12
Version	trunk
OS	All
CC	@d0k,@hfinkel

Extended Description

The current clang trunk crashes when compiling the following testcase at -O0 (and above) in both 32-bit and 64-bit modes on x86_64-linux-gnu.

This is a regression from clang 3.4.

$ clang-trunk -v
clang version 3.5 (trunk 202395)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
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/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-3.4 -O0 -c small.c
$
$ clang-trunk -O0 -c small.c
0 clang 0x00000000023992f5 llvm::sys::PrintStackTrace(_IO_FILE*) + 37
1 clang 0x0000000002399ae3
2 libpthread.so.0 0x00007fcb78bcecb0
3 clang 0x0000000000e125f7 clang::sema::AnalysisBasedWarnings::IssueWarnings(clang::sema::AnalysisBasedWarnings::Policy, clang::sema::FunctionScopeInfo*, clang::Decl const*, clang::BlockExpr const*) + 2903
4 clang 0x0000000000a91943 clang::Sema::PopFunctionScopeInfo(clang::sema::AnalysisBasedWarnings::Policy const*, clang::Decl const*, clang::BlockExpr const*) + 99
5 clang 0x0000000000b36e2e clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool) + 3342
6 clang 0x0000000000a62f48 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) + 280
7 clang 0x00000000009f07dd clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) + 2093
8 clang 0x0000000000a0278d clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, unsigned int, bool, clang::SourceLocation*, clang::Parser::ForRangeInit*) + 1389
9 clang 0x00000000009efd59 clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) + 697
10 clang 0x00000000009ef7b3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) + 403
11 clang 0x00000000009eeb67 clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) + 2615
12 clang 0x00000000009ee05e clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) + 446
13 clang 0x00000000009eaa00 clang::ParseAST(clang::Sema&, bool, bool) + 256
14 clang 0x000000000085a34e clang::CodeGenAction::ExecuteAction() + 142
15 clang 0x00000000006b0ea0 clang::FrontendAction::Execute() + 112
16 clang 0x000000000068be5d clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 925
17 clang 0x000000000067273f clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2959
18 clang 0x0000000000669c5c cc1_main(char const**, char const**, char const*, void*) + 700
19 clang 0x00000000006707f8 main + 9864
20 libc.so.6 0x00007fcb779d776d __libc_start_main + 237
21 clang 0x00000000006698b9
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -main-file-name small.c -mrelocation-model static -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version 2.22 -coverage-file /data2/c-hunter-results/C/trans-bugs/20140227-clang-m32-m64-O0-O1-O2-O3-Os-build-test152841/small.o -resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.5 -internal-isystem /usr/local/include -internal-isystem /usr/local/clang-trunk/bin/../lib/clang/3.5/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O0 -fdebug-compilation-dir /data2/c-hunter-results/C/trans-bugs/20140227-clang-m32-m64-O0-O1-O2-O3-Os-build-test152841 -ferror-limit 19 -fmessage-length 131 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o small.o -x c small.c

1. parser at end of file
2. small.c:3:1: parsing function body 'foo'
   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 3.5 (trunk 202395)
   Target: x86_64-unknown-linux-gnu
   Thread model: posix
   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-75d5d5.c
clang: note: diagnostic msg: /tmp/small-75d5d5.sh
clang: note: diagnostic msg:

---

$

---

int
foo ()
{
lbl:
if (1)
goto lbl;
}

[d0k]

Fixed in r202491.