[LLVMdev] Crash on invalid during LLVMContext destruction MDNode::dropAllReferences

[David Blaikie]

Hi Duncan,

I came across something like the following recently which I guess might be
related to your recent work. Any ideas?

$ clang++-tot -cc1 crash_on_invalid.cpp -g -emit-obj -fexceptions
-fcxx-exceptions
crash_on_invalid.cpp:13:1: error: C++ requires a type specifier for all
declarations
x;
^
1 error generated.
*** Error in `clang++-tot': corrupted double-linked list:
0x000000000754f340 ***
^C
blaikie at blaikie-linux:/tmp/dbginfo$ cat crash_on_invalid.cpp
// RUN: %clang_cc1 -fexceptions -fcxx-exceptions -g -std=c++11 -S
-emit-llvm %s -o - | FileCheck %s

extern "C" __complex float complex_src();

struct foo {
  __complex float k;
  foo();
};

foo::foo()
    : k(complex_src()) {
}
x;


In some nearby/related test cases rather than a vague corrupted
double-linked list error, I get a stack something like:

#0 0x1efe5de llvm::sys::PrintStackTrace(_IO_FILE*)
/usr/local/google/home/blaikie/dev/llvm/src/lib/Support/Unix/Signals.inc:422:15
#1 0x1eff37b PrintStackTraceSignalHandler(void*)
/usr/local/google/home/blaikie/dev/llvm/src/lib/Support/Unix/Signals.inc:481:1
#2 0x1f01653 SignalHandler(int)
/usr/local/google/home/blaikie/dev/llvm/src/lib/Support/Unix/Signals.inc:198:60
#3 0x7f6893e22340 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10340)
#4 0x1ae3a9f bool llvm::DenseMapBase<llvm::SmallDenseMap<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, 4u, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >, void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >::LookupBucketFor<void*>(void* const&,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > const*&) const
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/ADT/DenseMap.h:495:34
#5 0x1ae3968 bool llvm::DenseMapBase<llvm::SmallDenseMap<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, 4u, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >, void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >::LookupBucketFor<void*>(void* const&,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> >*&)
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/ADT/DenseMap.h:525:10
#6 0x1ad2453 llvm::DenseMapBase<llvm::SmallDenseMap<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, 4u, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >, void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long>, llvm::DenseMapInfo<void*>,
llvm::detail::DenseMapPair<void*,
std::pair<llvm::PointerUnion<llvm::MetadataAsValue*, llvm::Metadata*>,
unsigned long> > >::erase(void* const&)
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/ADT/DenseMap.h:200:10
#7 0x1ad23da llvm::ReplaceableMetadataImpl::dropRef(void*)
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/Metadata.cpp:134:8
#8 0x1ae5c6a llvm::MetadataTracking::untrack(void*, llvm::Metadata&)
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/MetadataTracking.cpp:43:1
#9 0xa1282c llvm::MetadataTracking::untrack(llvm::Metadata*&)
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/IR/MetadataTracking.h:69:59
#10 0x1ae5221 llvm::MDOperand::untrack()
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/IR/Metadata.h:562:3
#11 0x1ad6d84 llvm::MDOperand::reset(llvm::Metadata*, llvm::Metadata*)
/usr/local/google/home/blaikie/dev/llvm/src/include/llvm/IR/Metadata.h:545:5
#12 0x1ad4efd llvm::MDNode::setOperand(unsigned int, llvm::Metadata*)
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/Metadata.cpp:764:1
#13 0x1ad58cd llvm::MDNode::dropAllReferences()
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/Metadata.cpp:492:49
#14 0x1aaccc9 llvm::LLVMContextImpl::~LLVMContextImpl()
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/LLVMContextImpl.cpp:142:5
#15 0x1aaa24d llvm::LLVMContext::~LLVMContext()
/usr/local/google/home/blaikie/dev/llvm/src/lib/IR/LLVMContext.cpp:97:31
#16 0x2555d3b clang::CodeGenAction::~CodeGenAction()
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/lib/CodeGen/CodeGenAction.cpp:578:5
#17 0x2558295 clang::EmitLLVMAction::~EmitLLVMAction()
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/include/clang/CodeGen/CodeGenAction.h:77:7
#18 0x25582b9 clang::EmitLLVMAction::~EmitLLVMAction()
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/include/clang/CodeGen/CodeGenAction.h:77:7
#19 0x213a2e2
std::default_delete<clang::FrontendAction>::operator()(clang::FrontendAction*)
const
/usr/local/google/home/blaikie/install/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../include/c++/4.9.0/bits/unique_ptr.h:77:7
#20 0x213a256 std::unique_ptr<clang::FrontendAction,
std::default_delete<clang::FrontendAction> >::~unique_ptr()
/usr/local/google/home/blaikie/install/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../include/c++/4.9.0/bits/unique_ptr.h:237:2
#21 0x228a7c1 clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:226:1
#22 0x9f8a47 cc1_main(llvm::ArrayRef<char const*>, char const*, void*)
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/tools/driver/cc1_main.cpp:110:3
#23 0x9ee003 ExecuteCC1Tool(llvm::ArrayRef<char const*>, llvm::StringRef)
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/tools/driver/driver.cpp:369:12
#24 0x9ed057 main
/usr/local/google/home/blaikie/dev/llvm/src/tools/clang/tools/driver/driver.cpp:415:12
#25 0x7f689354eec5 __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:321:0
#26 0x9ecaf4 _start
(/mnt/fast/dev/llvm/build/clang/debug/split/notypes/nostandalone/bin/clang-3.5+0x9ecaf4)
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