[LLVMbugs] [Bug 24013] New: clang crashes at -O1 and above on x86_64-linux-gnu

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jul 1 20:03:29 PDT 2015


https://llvm.org/bugs/show_bug.cgi?id=24013

            Bug ID: 24013
           Summary: clang crashes 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 test case on
x86_64-linux-gnu at -O1 and above in both 32-bit and 64-bit modes.

This is a regression from 3.6.x.


$ clang-trunk -v
clang version 3.7.0 (trunk 241180)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.1.0
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/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.1.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clang-trunk -O0 -c small.c
$ clang-3.6 -O1 -c small.c
$ 
$ clang-trunk -O1 -c small.c
clang: /tmp/llvm/lib/Transforms/Scalar/LICM.cpp:615: bool
sink(llvm::Instruction &, const llvm::LoopInfo *, const llvm::DominatorTree *,
const llvm::Loop *, llvm::AliasSetTracker *): Assertion
`ExitBlockSet.count(ExitBlock) && "The LCSSA PHI is not in an exit block!"'
failed.
#0 0x2b6e0a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang+0x2b6e0a8)
#1 0x2b6f45b (/usr/local/clang-trunk/bin/clang+0x2b6f45b)
#2 0x7f7fe6c81340 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#3 0x7f7fe5c1ccc9 gsignal
/build/buildd/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#4 0x7f7fe5c200d8 abort /build/buildd/eglibc-2.19/stdlib/abort.c:91:0
#5 0x7f7fe5c15b86 __assert_fail_base
/build/buildd/eglibc-2.19/assert/assert.c:92:0
#6 0x7f7fe5c15c32 (/lib/x86_64-linux-gnu/libc.so.6+0x2fc32)
#7 0x25665d0 (/usr/local/clang-trunk/bin/clang+0x25665d0)
#8 0x25654db llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x25654db)
#9 0x2564f9a llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x2564f9a)
#10 0x2564f9a llvm::sinkRegion(llvm::DomTreeNodeBase<llvm::BasicBlock>*,
llvm::AliasAnalysis*, llvm::LoopInfo*, llvm::DominatorTree*,
llvm::TargetLibraryInfo*, llvm::Loop*, llvm::AliasSetTracker*,
llvm::LICMSafetyInfo*) (/usr/local/clang-trunk/bin/clang+0x2564f9a)
#11 0x2568467 (/usr/local/clang-trunk/bin/clang+0x2568467)
#12 0x285e46e llvm::LPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x285e46e)
#13 0x2acf334 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang+0x2acf334)
#14 0x27a0f98 (/usr/local/clang-trunk/bin/clang+0x27a0f98)
#15 0x2acfa55 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang+0x2acfa55)
#16 0x972143 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions
const&, llvm::StringRef, llvm::Module*, clang::BackendAction,
llvm::raw_pwrite_stream*) (/usr/local/clang-trunk/bin/clang+0x972143)
#17 0x963ea5 (/usr/local/clang-trunk/bin/clang+0x963ea5)
#18 0xb85743 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang+0xb85743)
#19 0x762af2 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang+0x762af2)
#20 0x73250c clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang+0x73250c)
#21 0x71451c clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang+0x71451c)
#22 0x70b404 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
(/usr/local/clang-trunk/bin/clang+0x70b404)
#23 0x712d6e main (/usr/local/clang-trunk/bin/clang+0x712d6e)
#24 0x7f7fe5c07ec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#25 0x70afad _start (/usr/local/clang-trunk/bin/clang+0x70afad)
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
-coverage-file
/home/su/check/tmp/20150625-clang-trunk-m64-g-O3-build-205445/delta/small.c
-resource-dir /usr/local/clang-trunk/bin/../lib/clang/3.7.0 -internal-isystem
/usr/local/include -internal-isystem
/usr/local/clang-trunk/bin/../lib/clang/3.7.0/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O1 -fdebug-compilation-dir
/home/su/check/tmp/20150625-clang-trunk-m64-g-O3-build-205445/delta
-ferror-limit 19 -fmessage-length 104 -mstackrealign -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o small.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 '@fn1'
5.    Running pass 'Loop Invariant Code Motion' on basic block
'%for.cond.outer'
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 3.7.0 (trunk 241180)
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-6b30bd.c
clang: note: diagnostic msg: /tmp/small-6b30bd.sh
clang: note: diagnostic msg: 

********************


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


int a, b, d, e, f, g, i, j, k;
volatile int c;
static int h;

void
fn1 ()
{
  int l = 0, m;
lbl:
  if (l)
    k = m;
  for (;;)
    {
      int n;
      i = m = 0;
      if (l)
    {
      {
        int o;
        if (d)
          break;
      }
      b = 0;
      continue;
    }
      l = j;
      if (h)
    goto lbl;
      m = c != 0;
      if (g)
    {
      int p;
      if (e)
        continue;
      if (l)
        continue;
    }
    }
  for (; f; f++)
    for (; a;)
      ;
}

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