[LLVMbugs] [Bug 15851] New: Clang hangs at -O1

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15851

            Bug ID: 15851
           Summary: Clang hangs at -O1
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: antoine.balestrat at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Using LLVM/Clang as of r180602 :

$ cat inf.c
void f(void)
{
    int i, **p;

    f();
    for(;; i++)
        for(i = 0; i < 2; i++)
            (i /= 2) && (**p = 0);
}

$ ulimit -t 60

$ clong -O1 -w inf.c
0  clang           0x0000000001d6ab62 llvm::sys::PrintStackTrace(_IO_FILE*) +
34
1  clang           0x0000000001d6a881
2  libpthread.so.0 0x00007f74b261d030
3  libc.so.6       0x00007f74b1751132
4  libc.so.6       0x00007f74b1754aac cfree + 108
5  clang           0x0000000001d1a1b3 llvm::Value::~Value() + 515
6  clang           0x0000000001cee907
7  clang           0x0000000001b26825
8  clang           0x0000000001a71ff2
llvm::SimplifyInstructionsInBlock(llvm::BasicBlock*, llvm::DataLayout const*,
llvm::TargetLibraryInfo const*) + 354
9  clang           0x0000000001969d95
10 clang           0x000000000196ab19
11 clang           0x000000000196bdea
12 clang           0x0000000001d049af
llvm::FPPassManager::runOnFunction(llvm::Function&) + 655
13 clang           0x0000000001ac20f6
14 clang           0x0000000001d044d7
llvm::MPPassManager::runOnModule(llvm::Module&) + 663
15 clang           0x0000000001d0467f llvm::PassManagerImpl::run(llvm::Module&)
+ 207
16 clang           0x00000000008f66b2
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 3458
17 clang           0x00000000008f432f
18 clang           0x0000000000a5793a clang::ParseAST(clang::Sema&, bool, bool)
+ 538
19 clang           0x00000000008f2abe clang::CodeGenAction::ExecuteAction() +
78
20 clang           0x000000000077b499 clang::FrontendAction::Execute() + 265
21 clang           0x000000000075d9fa
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 346
22 clang           0x00000000007456a2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1794
23 clang           0x000000000073f9a8 cc1_main(char const**, char const**, char
const*, void*) + 920
24 clang           0x00000000007330c0 main + 7744
25 libc.so.6       0x00007f74b16f7ead __libc_start_main + 253
26 clang           0x000000000073f461
Stack dump:
0.    Program arguments: /home/merkil/clang/build/Release+Asserts/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name
inf.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
/home/merkil/clang/build/Release+Asserts/bin/../lib/clang/3.3 -internal-isystem
/usr/local/include -internal-isystem
/home/merkil/clang/build/Release+Asserts/bin/../lib/clang/3.3/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O1
-w -fdebug-compilation-dir /home/merkil -ferror-limit 19 -fmessage-length 169
-mstackrealign -fobjc-runtime=gcc -fobjc-default-synthesize-properties
-fdiagnostics-show-option -fcolor-diagnostics -backend-option -vectorize-loops
-o /tmp/inf-ne2Y62.o -x c inf.c 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module 'inf.c'.
4.    Running pass 'Jump Threading' on function '@f'
clang: error: unable to execute command: CPU time limit exceeded
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.3 (trunk 180602)
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.

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