YCM (libclang.so) crash

[wdl83]

Hi,

I'm using latest (1b4eb61) version of YCM and
I encountered a 100% crashable situation with YCM (which gives such trace):
#0 0x00007ffff6cba475 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff6cbd6f0 in abort () from /lib/x86_64-linux-gnu/libc.so.6 ++j)
#2 0x00007ffff6cb3621 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007ffff52652ea in clang::DiagnosticsEngine::EmitCurrentDiagnostic(bool) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#4 0x00007ffff4be62c4 in EmitUnknownDiagWarning(clang::DiagnosticsEngine&, llvm::StringRef, llvm::StringRef, bool) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#5 0x00007ffff4be5b9d in clang::ProcessWarningOptions(clang::DiagnosticsEngine&, clang::DiagnosticOptions const&) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#6 0x00007ffff4b9e8aa in clang::ASTUnit::CodeComplete(llvm::StringRef, unsigned int, unsigned int, std::pair<std::string, llvm::PointerUnion<char const*, llvm::MemoryBuffer const*> >, unsigned int, bool, bool, bool, clang::CodeCompleteConsumer&, clang::DiagnosticsEngine&, clang::LangOptions&, clang::SourceManager&, clang::FileManager&, llvm::SmallVectorImplclang::StoredDiagnostic&, llvm::SmallVectorImpl<llvm::MemoryBuffer const>&) ()

from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#7 0x00007ffff49f5d61 in clang_codeCompleteAt_Impl () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#8 0x00007ffff52eee72 in llvm::CrashRecoveryContext::RunSafely(void ()(void), void*) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#9 0x00007ffff52eefe4 in RunSafelyOnThread_Dispatch(void*) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#10 0x00007ffff530823a in ExecuteOnThread_Dispatch(void*) () from /home/vlad/.vim/bundle/YouCompleteMe/autoload/../python/libclang.so
#11 0x00007ffff7018b50 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0rd);
#12 0x00007ffff6d62a7d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#13 0x0000000000000000 in ?? ()

Could you suggest how can I try to dig it deeper?
Thanks.

[wdl83]

It looks like const DiagnosticConsumer is not set:

const DiagnosticConsumer* clang::DiagnosticsEngine::getClient ( ) const;

bool DiagnosticsEngine::EmitCurrentDiagnostic(bool Force) {
assert(getClient() && "DiagnosticClient not set!");

bool Emitted;
if (Force) {
Diagnostic Info(this);

// Figure out the diagnostic level of this message.
DiagnosticIDs::Level DiagLevel
  = Diags->getDiagnosticLevel(Info.getID(), Info.getLocation(), *this);

Emitted = (DiagLevel != DiagnosticIDs::Ignored);
if (Emitted) {
  // Emit the diagnostic regardless of suppression level.
  Diags->EmitDiag(*this, DiagLevel);
}

} else {
// Process the diagnostic, sending the accumulated information to the
// DiagnosticConsumer.
Emitted = ProcessDiag();
}

// Clear out the current diagnostic object.
unsigned DiagID = CurDiagID;
Clear();

// If there was a delayed diagnostic, emit it now.
if (!Force && DelayedDiagID && DelayedDiagID != DiagID)
ReportDelayed();

return Emitted;
}

Wlodek

PS: how to properly insert source code into github comments?

[Valloric]

This is a Clang bug, not a YCM bug. Please report it on the Clang issue tracker.