[llvm-bugs] [Bug 35516] New: [CLANG] Seg fault when trying to compile LLVM IR : problem with phi node

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35516

            Bug ID: 35516
           Summary: [CLANG] Seg fault when trying to compile LLVM IR :
                    problem with phi node
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolas.bonfante at insa-lyon.fr
                CC: llvm-bugs at lists.llvm.org

Created attachment 19517
  --> https://bugs.llvm.org/attachment.cgi?id=19517&action=edit
Source code that seg fault when compiled with clang

Hi all,

When I try to compile (with command line : "clang simple.ll -o exec") the llvm
ir file in attachment, I get a seg fault. My machine is linux (ubuntu 16.04)
machine with an intel i7 and 16gb of ram.

I got the following error report :

warning: overriding the module target triple with x86_64-pc-linux-gnu
[-Woverride-module]
0  libLLVM-3.8.so.1 0x00007fa1d9183d38
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 56
1  libLLVM-3.8.so.1 0x00007fa1d9181fc6 llvm::sys::RunSignalHandlers() + 54
2  libLLVM-3.8.so.1 0x00007fa1d9182129
3  libc.so.6        0x00007fa1d82be4b0
4  libLLVM-3.8.so.1 0x00007fa1d92a6c39
llvm::PHINode::removeIncomingValue(unsigned int, bool) + 73
5  libLLVM-3.8.so.1 0x00007fa1d91a4847
llvm::BasicBlock::removePredecessor(llvm::BasicBlock*, bool) + 487
6  libLLVM-3.8.so.1 0x00007fa1d951e152
7  libLLVM-3.8.so.1 0x00007fa1d92c92a2
llvm::FPPassManager::runOnFunction(llvm::Function&) + 498
8  libLLVM-3.8.so.1 0x00007fa1d92c963b
llvm::FPPassManager::runOnModule(llvm::Module&) + 43
9  libLLVM-3.8.so.1 0x00007fa1d92c8eef
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 783
10 clang            0x00000000006eb0d3
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&,
llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::raw_pwrite_stream*)
+ 4403
11 clang            0x0000000000a16e71
12 clang            0x000000000099aa0e clang::FrontendAction::Execute() + 302
13 clang            0x0000000000970406
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 278
14 clang            0x0000000000a152b3
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1987
15 clang            0x00000000006b3528 cc1_main(llvm::ArrayRef<char const*>,
char const*, void*) + 2264
16 clang            0x00000000006affbc main + 6252
17 libc.so.6        0x00007fa1d82a9830 __libc_start_main + 240
18 clang            0x00000000006b1969 _start + 41
Stack dump:
0.      Program arguments: /usr/lib/llvm-3.8/bin/clang -cc1 -triple
x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier
-main-file-name simple.ll -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -resource-dir /usr/lib/llvm-3.8/bin/../lib/clang/3.8.0
-fdebug-compilation-dir /home/nico/testCompiler -ferror-limit 19
-fmessage-length 134 -fobjc-runtime=gcc -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/simple-b4ad3b.o -x ir simple.ll 
1.      Code generation
2.      Running pass 'Function Pass Manager' on module 'simple.ll'.
3.      Running pass 'Remove unreachable blocks from the CFG' on function
'@simple'
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 3.8.0-2ubuntu4 (tags/RELEASE_380/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
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: Error generating preprocessed source(s) - no
preprocessable inputs.


Anybody have an idea what is the problem ?

Cheers,

Nicolas

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