[LLVMbugs] [Bug 18615] New: clang crashes on valid code at -O1 and above on x86_64-linux-gnu

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18615

            Bug ID: 18615
           Summary: clang crashes on valid code at -O1 and above on
                    x86_64-linux-gnu
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The current clang trunk crashes when compiling the following testcase at -O1
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 199196)
Target: x86_64-unknown-linux-gnu
Thread model: posix
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/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
$ 
$ clang-trunk -O0 small.c
$ clang-3.4 -O1 small.c
$ 
$ clang-trunk -O1 small.c
clang: /tmp/llvm/include/llvm/ADT/SmallVector.h:140: reference
llvm::SmallVectorTemplateCommon<<anonymous>::Slice, void>::operator[](unsigned
int) [T = <anonymous>::Slice]: Assertion `begin() + idx < end()' failed.
0  clang           0x000000000231e755 llvm::sys::PrintStackTrace(_IO_FILE*) +
37
1  clang           0x000000000231ef43
2  libpthread.so.0 0x00007f0dff446cb0
3  libc.so.6       0x00007f0dfe268425 gsignal + 53
4  libc.so.6       0x00007f0dfe26bb8b abort + 379
5  libc.so.6       0x00007f0dfe2610ee
6  libc.so.6       0x00007f0dfe261192
7  clang           0x0000000001f62b4f
8  clang           0x0000000001f53280
9  clang           0x0000000001f50070
10 clang           0x00000000022365da
llvm::FPPassManager::runOnFunction(llvm::Function&) + 362
11 clang           0x0000000002067c8a
12 clang           0x0000000002236e07
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 999
13 clang           0x00000000008638c3
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
6211
14 clang           0x00000000008613d1
15 clang           0x00000000009ebbc3 clang::ParseAST(clang::Sema&, bool, bool)
+ 515
16 clang           0x000000000086022e clang::CodeGenAction::ExecuteAction() +
142
17 clang           0x00000000006cac50 clang::FrontendAction::Execute() + 112
18 clang           0x00000000006a7e4d
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 925
19 clang           0x000000000068eb50
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 2880
20 clang           0x0000000000686dc4 cc1_main(char const**, char const**, char
const*, void*) + 692
21 clang           0x000000000068cdb0 main + 9184
22 libc.so.6       0x00007f0dfe25376d __libc_start_main + 237
23 clang           0x0000000000686a49
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 -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -target-linker-version 2.22
-momit-leaf-frame-pointer -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 -O1 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/20140124-clang-m32-m64-O2-O3-build-test151153
-ferror-limit 19 -fmessage-length 104 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o
/tmp/small-dc936b.o -x c small.c 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module 'small.c'.
4.    Running pass 'SROA' 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 3.5 (trunk 199196)
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-9eeb1c.c
clang: note: diagnostic msg: /tmp/small-9eeb1c.sh
clang: note: diagnostic msg: 

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


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


int a;

struct S0
{
  int f0;
  int f1;
  int f2;
};

void
fn1 ()
{
  int b = -1;  
  struct S0 f[1];
  if (a)
    f[0] = f[b];
}

int
main ()
{
  fn1 ();
  return 0;
}

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