[LLVMbugs] [Bug 18861] New: clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sun Feb 16 10:53:19 PST 2014


http://llvm.org/bugs/show_bug.cgi?id=18861

            Bug ID: 18861
           Summary: clang crashes on valid code at -O2 and -O3 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 -O2
and -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu. 

This is a regression from clang 3.4.

Perhaps related to the recently fixed 18361? 

$ clang-trunk -v
clang version 3.5 (trunk 201494)
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 multiilb: .;@m64
Candidate multiilb: 32;@m32
Selected multilib: .;@m64
$ 
$ clang-trunk -Os small.c; a.out
$ clang-3.4 -O2 small.c; a.out
$ 
$ clang-trunk -O2 small.c
clang: /tmp/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp:1901: virtual bool
{anonymous}::IndVarSimplify::runOnLoop(llvm::Loop*, llvm::LPPassManager&):
Assertion `L->isLCSSAForm(*DT) && "Indvars did not leave the loop in lcssa
form!"' failed.
0  clang           0x00000000025afbe2 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1  clang           0x00000000025af749
2  libpthread.so.0 0x00007f4683dfdcb0
3  libc.so.6       0x00007f4682e23425 gsignal + 53
4  libc.so.6       0x00007f4682e26b8b abort + 379
5  libc.so.6       0x00007f4682e1c0ee
6  libc.so.6       0x00007f4682e1c192
7  clang           0x000000000211fc8f
8  clang           0x000000000234942f
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1711
9  clang           0x000000000249a84f
llvm::FPPassManager::runOnFunction(llvm::Function&) + 639
10 clang           0x00000000022b5df6
11 clang           0x000000000249c9cf
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 863
12 clang           0x00000000008c9288
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) +
2840
13 clang           0x00000000008c46fe
14 clang           0x0000000000a6ad62 clang::ParseAST(clang::Sema&, bool, bool)
+ 514
15 clang           0x00000000008c6031 clang::CodeGenAction::ExecuteAction() +
97
16 clang           0x000000000070aa79 clang::FrontendAction::Execute() + 265
17 clang           0x00000000006e83dd
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 349
18 clang           0x00000000006cdff6
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1222
19 clang           0x00000000006c7bc8 cc1_main(char const**, char const**, char
const*, void*) + 1208
20 clang           0x00000000006b297c main + 716
21 libc.so.6       0x00007f4682e0e76d __libc_start_main + 237
22 clang           0x00000000006c68d1
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 -fuse-init-array -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 -O2 -fdebug-compilation-dir
/data2/c-hunter-results/C/trans-bugs/REDUCED/20140211-clang-m32-m64-O2-O3-build-test217836
-ferror-limit 19 -fmessage-length 106 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp
-o /tmp/small-ff4ea5.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 'Loop Pass Manager' on function '@fn2'
5.    Running pass 'Induction Variable Simplification' on basic block
'%for.cond1thread-pre-split'
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 201494)
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-cb829b.c
clang: note: diagnostic msg: /tmp/small-cb829b.sh
clang: note: diagnostic msg: 

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


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


int a, b, c, d, e, f;

int
fn1 ()
{
  f = b;
  for (e = 0; e < 2; e++)
    {
      d = 0;
      if (e)
    return 0;
    }
  for (;;)
    ;
}

void
fn2 ()
{
  for (; b; b++)
    for (; c; c++)
      {
    a = 0;
    fn1 ();
      }
}

int
main ()
{
  fn2 (); 
  return 0;
}

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