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<div class=WordSection1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Chris,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I checked out the lastest LLVM and Clang from trunk last
night. It still crashes, here’s the backtrace. Any other
ideas? Is the way we’re using it supposed to work? If it is,
we can dig in and see what’s going wrong.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bes,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Martin<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>*** glibc detected *** ./boom: double free or
corruption (fasttop): 0x0000000004136370 ***<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>======= Backtrace: =========<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>/lib/libc.so.6[0x7fc2fe7a92f6]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>/lib/libc.so.6(cfree+0x6c)[0x7fc2fe7adc6c]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(__gnu_cxx::new_allocator<llvm::PassRegistrationListener*>::deallocate(llvm::PassRegistrationListener**,
unsigned long)+0x1d)[0x1c24c85]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(std::_Vector_base<llvm::PassRegistrationListener*,
std::allocator<llvm::PassRegistrationListener*>
>::_M_deallocate(llvm::PassRegistrationListener**, unsigned
long)+0x2f)[0x1c24cb7]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(std::vector<llvm::PassRegistrationListener*,
std::allocator<llvm::PassRegistrationListener*>
>::_M_insert_aux(__gnu_cxx::__normal_iterator<llvm::PassRegistrationListener**,
std::vector<llvm::PassRegistrationListener*, std::allocator<llvm::PassRegistrationListener*>
> >, llvm::PassRegistrationListener* const&)+0x310)[0x1c24fca]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(std::vector<llvm::PassRegistrationListener*,
std::allocator<llvm::PassRegistrationListener*>
>::push_back(llvm::PassRegistrationListener* const&)+0x6c)[0x1c25098]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::PassRegistry::addRegistrationListener(llvm::PassRegistrationListener*)+0x2e)[0x1c22f90]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::PassRegistrationListener::PassRegistrationListener()+0x2f)[0x1c12163]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom((anonymous
namespace)::GetCFGOnlyPasses::GetCFGOnlyPasses(llvm::SmallVector<void
const*, 32u>&)+0x19)[0x1c132b5]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::AnalysisUsage::setPreservesCFG()+0x20)[0x1c12186]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom((anonymous
namespace)::SROA::getAnalysisUsage(llvm::AnalysisUsage&)
const+0x2b)[0x1a0b78d]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::PMTopLevelManager::findAnalysisUsage(llvm::Pass*)+0xa7)[0x1c14917]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::PMTopLevelManager::schedulePass(llvm::Pass*)+0xd7)[0x1c15e3b]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::FunctionPassManagerImpl::add(llvm::Pass*)+0x24)[0x1c22398]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::FunctionPassManager::addImpl(llvm::Pass*)+0x21)[0x1c1638d]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(llvm::FunctionPassManager::add(llvm::Pass*)+0x12c)[0x1c164bc]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom[0x107e70b]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom((anonymous
namespace)::EmitAssemblyHelper::CreatePasses()+0xaf)[0x107ed0f]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom((anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, llvm::raw_ostream*)+0x77)[0x107ee83]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::EmitBackendOutput(clang::Diagnostic&,
clang::CodeGenOptions const&, clang::TargetOptions const&,
llvm::Module*, clang::BackendAction, llvm::raw_ostream*)+0x73)[0x107f255]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom((anonymous namespace)::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)+0x189)[0x107ce91]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::ParseAST(clang::Sema&,
bool)+0x216)[0x11bc388]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::ASTFrontendAction::ExecuteAction()+0xea)[0xf4e370]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::CodeGenAction::ExecuteAction()+0x352)[0x107b87c]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::FrontendAction::Execute()+0x100)[0xf4e478]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)+0x294)[0xf35414]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>./boom(go(void*)+0x25f)[0xf2ff93]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>/lib/libpthread.so.0[0x7fc2ff458a04]<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;
font-family:"Lucida Console"'>/lib/libc.so.6(clone+0x6d)[0x7fc2fe812d4d]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Chris Lattner
[mailto:clattner@apple.com] <br>
<b>Sent:</b> Monday, September 13, 2010 6:43 PM<br>
<b>To:</b> Martin C. Martin<br>
<b>Cc:</b> Clang Dev; Owen Anderson<br>
<b>Subject:</b> Re: [cfe-dev] Threading and Clang<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<div>
<p class=MsoNormal>On Sep 13, 2010, at 2:20 PM, Martin C. Martin wrote:<o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Hi,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>We’re
considering using Clang as a just in time compiler. It works great in a
single thread, but we can’t get it working from multiple threads.<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Here’s
one attempt, where we create a single execution engine used by all threads, and
one compiler instance per thread. The result is corruption and a core
dump. We’ve also tried giving each thread its own execution engine,
still no dice. This is with Clang/LLVM 2.7 on Ubuntu 9.10.<o:p></o:p></span></p>
</div>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>I'm not sure, but I'd strongly recommend upgrading to llvm
2.8 prerelease.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>-Chris<o:p></o:p></p>
</div>
<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>I’ve
also attached a self contained zip file with the exact compile line and code
that reproduces the problem.<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Any
idea what we’re doing wrong?<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Thanks,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Martin<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Here’s
an example stack trace:<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>***
glibc detected *** ./boom: double free or corruption (fasttop):
0x00007fb9b421c9b0 ***<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>=======
Backtrace: =========<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>/lib/libc.so.6[0x7fbabcf352f6]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>/lib/libc.so.6(cfree+0x6c)[0x7fbabcf39c6c]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::AttributeListImpl::DropRef()+0x3e)[0x18b4a4c]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::AttrListPtr::operator=(llvm::AttrListPtr
const&)+0x45)[0x18b3953]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::Function::setAttributes(llvm::AttrListPtr
const&)+0x24)[0xec2e1c]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::Function::addAttribute(unsigned
int, unsigned int)+0x5d)[0x19101e5]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::Argument::addAttr(unsigned
int)+0x32)[0x191094a]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::FunctionAttrs::AddNoCaptureAttrs(std::vector<llvm::CallGraphNode*,
std::allocator<llvm::CallGraphNode*> > const&)+0x131)[0x12e3f05]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::FunctionAttrs::runOnSCC(std::vector<llvm::CallGraphNode*,
std::allocator<llvm::CallGraphNode*> >&)+0x32)[0x12e464e]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::CGPassManager::RunPassOnSCC(llvm::Pass*,
std::vector<llvm::CallGraphNode*, std::allocator<llvm::CallGraphNode*>
>&, llvm::CallGraph&, bool&)+0xa8)[0x17fafb4]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)+0x24e)[0x17fb418]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::MPPassManager::runOnModule(llvm::Module&)+0x17e)[0x194930c]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::PassManagerImpl::run(llvm::Module&)+0x6f)[0x194b0b1]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(llvm::PassManager::run(llvm::Module&)+0x21)[0x194b113]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::BackendConsumer::EmitAssembly()+0x241)[0xdfc3f9]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom((anonymous
namespace)::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)+0x91)[0xdffcef]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(clang::ParseAST(clang::Preprocessor&,
clang::ASTConsumer*, clang::ASTContext&, bool, bool,
clang::CodeCompleteConsumer*)+0x2a4)[0xfc7164]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(clang::ASTFrontendAction::ExecuteAction()+0x100)[0xe177a2]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(clang::FrontendAction::Execute()+0xe2)[0xe17892]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)+0x2a3)[0xe01427]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>./boom(go(void*)+0x25f)[0xdf64f3]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>/lib/libpthread.so.0[0x7fbabd9e0a04]<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>/lib/libc.so.6(clone+0x6d)[0x7fbabcf9ed4d]<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'><test.cpp><boom.tgz>_______________________________________________<br>
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